nameof cleanup

Ix.NET/Source/System.Interactive.Async/Aggregate.cs

@@ -15,11 +15,11 @@ namespace System.Linq
         public static Task<TResult> Aggregate<TSource, TAccumulate, TResult>(this IAsyncEnumerable<TSource> source, TAccumulate seed, Func<TAccumulate, TSource, TAccumulate> accumulator, Func<TAccumulate, TResult> resultSelector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (accumulator == null)
-                throw new ArgumentNullException("accumulator");
+                throw new ArgumentNullException(nameof(accumulator));
             if (resultSelector == null)
-                throw new ArgumentNullException("resultSelector");
+                throw new ArgumentNullException(nameof(resultSelector));
 
             return Aggregate(source, seed, accumulator, resultSelector, CancellationToken.None);
         }
@@ -27,9 +27,9 @@ namespace System.Linq
         public static Task<TAccumulate> Aggregate<TSource, TAccumulate>(this IAsyncEnumerable<TSource> source, TAccumulate seed, Func<TAccumulate, TSource, TAccumulate> accumulator)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (accumulator == null)
-                throw new ArgumentNullException("accumulator");
+                throw new ArgumentNullException(nameof(accumulator));
 
             return Aggregate(source, seed, accumulator, CancellationToken.None);
         }
@@ -37,9 +37,9 @@ namespace System.Linq
         public static Task<TSource> Aggregate<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, TSource, TSource> accumulator)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (accumulator == null)
-                throw new ArgumentNullException("accumulator");
+                throw new ArgumentNullException(nameof(accumulator));
 
             return Aggregate(source, accumulator, CancellationToken.None);
         }

Ix.NET/Source/System.Interactive.Async/AnyAll.cs

@@ -15,9 +15,9 @@ namespace System.Linq
         public static Task<bool> All<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, bool> predicate)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (predicate == null)
-                throw new ArgumentNullException("predicate");
+                throw new ArgumentNullException(nameof(predicate));
 
             return All(source, predicate, CancellationToken.None);
         }
@@ -35,9 +35,9 @@ namespace System.Linq
         public static Task<bool> Any<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, bool> predicate)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (predicate == null)
-                throw new ArgumentNullException("predicate");
+                throw new ArgumentNullException(nameof(predicate));
 
             return Any(source, predicate, CancellationToken.None);
         }
@@ -45,7 +45,7 @@ namespace System.Linq
         public static Task<bool> Any<TSource>(this IAsyncEnumerable<TSource> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Any(source, CancellationToken.None);
         }

Ix.NET/Source/System.Interactive.Async/AsyncEnumerable.cs

@@ -32,7 +32,7 @@ namespace System.Linq
         public static Task<bool> IsEmpty<TSource>(this IAsyncEnumerable<TSource> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return source.IsEmpty(CancellationToken.None);
         }

Ix.NET/Source/System.Interactive.Async/Average.cs

@@ -15,21 +15,21 @@ namespace System.Linq
         public static Task<double> Average(this IAsyncEnumerable<int> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             return Average(source, CancellationToken.None);
         }
 
         public static Task<double?> Average(this IAsyncEnumerable<int?> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             return Average(source, CancellationToken.None);
         }
 
         public static Task<double> Average(this IAsyncEnumerable<long> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Average(source, CancellationToken.None);
         }
@@ -37,7 +37,7 @@ namespace System.Linq
         public static Task<double?> Average(this IAsyncEnumerable<long?> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Average(source, CancellationToken.None);
         }
@@ -45,7 +45,7 @@ namespace System.Linq
         public static Task<double> Average(this IAsyncEnumerable<double> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Average(source, CancellationToken.None);
         }
@@ -53,7 +53,7 @@ namespace System.Linq
         public static Task<double?> Average(this IAsyncEnumerable<double?> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Average(source, CancellationToken.None);
         }
@@ -61,7 +61,7 @@ namespace System.Linq
         public static Task<float> Average(this IAsyncEnumerable<float> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Average(source, CancellationToken.None);
         }
@@ -69,7 +69,7 @@ namespace System.Linq
         public static Task<float?> Average(this IAsyncEnumerable<float?> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Average(source, CancellationToken.None);
         }
@@ -77,7 +77,7 @@ namespace System.Linq
         public static Task<decimal> Average(this IAsyncEnumerable<decimal> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Average(source, CancellationToken.None);
         }
@@ -85,7 +85,7 @@ namespace System.Linq
         public static Task<decimal?> Average(this IAsyncEnumerable<decimal?> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Average(source, CancellationToken.None);
         }
@@ -93,9 +93,9 @@ namespace System.Linq
         public static Task<double?> Average<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, int?> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Average(source, selector, CancellationToken.None);
         }
@@ -103,9 +103,9 @@ namespace System.Linq
         public static Task<double> Average<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, int> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Average(source, selector, CancellationToken.None);
         }
@@ -113,9 +113,9 @@ namespace System.Linq
         public static Task<double> Average<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, long> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Average(source, selector, CancellationToken.None);
         }
@@ -123,9 +123,9 @@ namespace System.Linq
         public static Task<double?> Average<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, long?> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Average(source, selector, CancellationToken.None);
         }
@@ -133,9 +133,9 @@ namespace System.Linq
         public static Task<double> Average<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, double> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Average(source, selector, CancellationToken.None);
         }
@@ -143,9 +143,9 @@ namespace System.Linq
         public static Task<double?> Average<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, double?> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Average(source, selector, CancellationToken.None);
         }
@@ -153,9 +153,9 @@ namespace System.Linq
         public static Task<float> Average<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, float> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Average(source, selector, CancellationToken.None);
         }
@@ -163,9 +163,9 @@ namespace System.Linq
         public static Task<float?> Average<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, float?> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Average(source, selector, CancellationToken.None);
         }
@@ -173,9 +173,9 @@ namespace System.Linq
         public static Task<decimal> Average<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, decimal> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Average(source, selector, CancellationToken.None);
         }
@@ -183,9 +183,9 @@ namespace System.Linq
         public static Task<decimal?> Average<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, decimal?> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Average(source, selector, CancellationToken.None);
         }

Ix.NET/Source/System.Interactive.Async/Contains.cs

@@ -15,9 +15,9 @@ namespace System.Linq
         public static Task<bool> Contains<TSource>(this IAsyncEnumerable<TSource> source, TSource value, IEqualityComparer<TSource> comparer)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (comparer == null)
-                throw new ArgumentNullException("comparer");
+                throw new ArgumentNullException(nameof(comparer));
 
             return Contains(source, value, comparer, CancellationToken.None);
         }
@@ -25,7 +25,7 @@ namespace System.Linq
         public static Task<bool> Contains<TSource>(this IAsyncEnumerable<TSource> source, TSource value)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Contains(source, value, CancellationToken.None);
         }

Ix.NET/Source/System.Interactive.Async/Count.cs

@@ -34,7 +34,7 @@ namespace System.Linq
         public static Task<int> Count<TSource>(this IAsyncEnumerable<TSource> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Count(source, CancellationToken.None);
         }
@@ -42,9 +42,9 @@ namespace System.Linq
         public static Task<int> Count<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, bool> predicate)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (predicate == null)
-                throw new ArgumentNullException("predicate");
+                throw new ArgumentNullException(nameof(predicate));
 
             return Count(source, predicate, CancellationToken.None);
         }
@@ -71,7 +71,7 @@ namespace System.Linq
         public static Task<long> LongCount<TSource>(this IAsyncEnumerable<TSource> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return LongCount(source, CancellationToken.None);
         }
@@ -79,9 +79,9 @@ namespace System.Linq
         public static Task<long> LongCount<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, bool> predicate)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (predicate == null)
-                throw new ArgumentNullException("predicate");
+                throw new ArgumentNullException(nameof(predicate));
 
             return LongCount(source, predicate, CancellationToken.None);
         }

Ix.NET/Source/System.Interactive.Async/ElementAt.cs

@@ -26,7 +26,7 @@ namespace System.Linq
         public static Task<TSource> ElementAt<TSource>(this IAsyncEnumerable<TSource> source, int index)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return ElementAt(source, index, CancellationToken.None);
         }
@@ -44,7 +44,7 @@ namespace System.Linq
         public static Task<TSource> ElementAtOrDefault<TSource>(this IAsyncEnumerable<TSource> source, int index)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return ElementAtOrDefault(source, index, CancellationToken.None);
         }

Ix.NET/Source/System.Interactive.Async/First.cs

@@ -15,7 +15,7 @@ namespace System.Linq
         public static Task<TSource> First<TSource>(this IAsyncEnumerable<TSource> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return First(source, CancellationToken.None);
         }
@@ -23,9 +23,9 @@ namespace System.Linq
         public static Task<TSource> First<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, bool> predicate)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (predicate == null)
-                throw new ArgumentNullException("predicate");
+                throw new ArgumentNullException(nameof(predicate));
 
             return First(source, predicate, CancellationToken.None);
         }
@@ -52,7 +52,7 @@ namespace System.Linq
         public static Task<TSource> FirstOrDefault<TSource>(this IAsyncEnumerable<TSource> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return FirstOrDefault(source, CancellationToken.None);
         }
@@ -60,9 +60,9 @@ namespace System.Linq
         public static Task<TSource> FirstOrDefault<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, bool> predicate)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (predicate == null)
-                throw new ArgumentNullException("predicate");
+                throw new ArgumentNullException(nameof(predicate));
 
             return FirstOrDefault(source, predicate, CancellationToken.None);
         }

Ix.NET/Source/System.Interactive.Async/ForEach.cs

@@ -15,9 +15,9 @@ namespace System.Linq
         public static void ForEach<TSource>(this IAsyncEnumerable<TSource> source, Action<TSource> action)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (action == null)
-                throw new ArgumentNullException("action");
+                throw new ArgumentNullException(nameof(action));
 
             source.ForEachAsync(action)
                   .Wait();
@@ -26,9 +26,9 @@ namespace System.Linq
         public static void ForEach<TSource>(this IAsyncEnumerable<TSource> source, Action<TSource, int> action)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (action == null)
-                throw new ArgumentNullException("action");
+                throw new ArgumentNullException(nameof(action));
 
             source.ForEachAsync(action)
                   .Wait();
@@ -60,9 +60,9 @@ namespace System.Linq
         public static Task ForEachAsync<TSource>(this IAsyncEnumerable<TSource> source, Action<TSource> action)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (action == null)
-                throw new ArgumentNullException("action");
+                throw new ArgumentNullException(nameof(action));
 
             return ForEachAsync(source, action, CancellationToken.None);
         }
@@ -70,9 +70,9 @@ namespace System.Linq
         public static Task ForEachAsync<TSource>(this IAsyncEnumerable<TSource> source, Action<TSource, int> action)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (action == null)
-                throw new ArgumentNullException("action");
+                throw new ArgumentNullException(nameof(action));
 
             return ForEachAsync(source, action, CancellationToken.None);
         }

Ix.NET/Source/System.Interactive.Async/Last.cs

@@ -15,7 +15,7 @@ namespace System.Linq
         public static Task<TSource> Last<TSource>(this IAsyncEnumerable<TSource> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Last(source, CancellationToken.None);
         }
@@ -23,9 +23,9 @@ namespace System.Linq
         public static Task<TSource> Last<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, bool> predicate)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (predicate == null)
-                throw new ArgumentNullException("predicate");
+                throw new ArgumentNullException(nameof(predicate));
 
             return Last(source, predicate, CancellationToken.None);
         }
@@ -52,7 +52,7 @@ namespace System.Linq
         public static Task<TSource> LastOrDefault<TSource>(this IAsyncEnumerable<TSource> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return LastOrDefault(source, CancellationToken.None);
         }
@@ -60,9 +60,9 @@ namespace System.Linq
         public static Task<TSource> LastOrDefault<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, bool> predicate)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (predicate == null)
-                throw new ArgumentNullException("predicate");
+                throw new ArgumentNullException(nameof(predicate));
 
             return LastOrDefault(source, predicate, CancellationToken.None);
         }

Ix.NET/Source/System.Interactive.Async/Lookup.cs

@@ -18,13 +18,13 @@ namespace System.Linq
         public static Task<ILookup<TKey, TElement>> ToLookup<TSource, TKey, TElement>(this IAsyncEnumerable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector, IEqualityComparer<TKey> comparer)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (keySelector == null)
-                throw new ArgumentNullException("keySelector");
+                throw new ArgumentNullException(nameof(keySelector));
             if (elementSelector == null)
-                throw new ArgumentNullException("elementSelector");
+                throw new ArgumentNullException(nameof(elementSelector));
             if (comparer == null)
-                throw new ArgumentNullException("comparer");
+                throw new ArgumentNullException(nameof(comparer));
 
             return ToLookup(source, keySelector, elementSelector, comparer, CancellationToken.None);
         }
@@ -32,11 +32,11 @@ namespace System.Linq
         public static Task<ILookup<TKey, TElement>> ToLookup<TSource, TKey, TElement>(this IAsyncEnumerable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (keySelector == null)
-                throw new ArgumentNullException("keySelector");
+                throw new ArgumentNullException(nameof(keySelector));
             if (elementSelector == null)
-                throw new ArgumentNullException("elementSelector");
+                throw new ArgumentNullException(nameof(elementSelector));
 
             return ToLookup(source, keySelector, elementSelector, CancellationToken.None);
         }
@@ -44,11 +44,11 @@ namespace System.Linq
         public static Task<ILookup<TKey, TSource>> ToLookup<TSource, TKey>(this IAsyncEnumerable<TSource> source, Func<TSource, TKey> keySelector, IEqualityComparer<TKey> comparer)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (keySelector == null)
-                throw new ArgumentNullException("keySelector");
+                throw new ArgumentNullException(nameof(keySelector));
             if (comparer == null)
-                throw new ArgumentNullException("comparer");
+                throw new ArgumentNullException(nameof(comparer));
 
             return ToLookup(source, keySelector, comparer, CancellationToken.None);
         }
@@ -56,9 +56,9 @@ namespace System.Linq
         public static Task<ILookup<TKey, TSource>> ToLookup<TSource, TKey>(this IAsyncEnumerable<TSource> source, Func<TSource, TKey> keySelector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (keySelector == null)
-                throw new ArgumentNullException("keySelector");
+                throw new ArgumentNullException(nameof(keySelector));
 
             return ToLookup(source, keySelector, CancellationToken.None);
         }

Ix.NET/Source/System.Interactive.Async/Max.cs

@@ -25,7 +25,7 @@ namespace System.Linq
         public static Task<int> Max(this IAsyncEnumerable<int> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Max(source, CancellationToken.None);
         }
@@ -33,7 +33,7 @@ namespace System.Linq
         public static Task<long> Max(this IAsyncEnumerable<long> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Max(source, CancellationToken.None);
         }
@@ -41,7 +41,7 @@ namespace System.Linq
         public static Task<double> Max(this IAsyncEnumerable<double> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Max(source, CancellationToken.None);
         }
@@ -49,7 +49,7 @@ namespace System.Linq
         public static Task<float> Max(this IAsyncEnumerable<float> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Max(source, CancellationToken.None);
         }
@@ -269,7 +269,7 @@ namespace System.Linq
         public static Task<decimal> Max(this IAsyncEnumerable<decimal> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Max(source, CancellationToken.None);
         }
@@ -277,7 +277,7 @@ namespace System.Linq
         public static Task<int?> Max(this IAsyncEnumerable<int?> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Max(source, CancellationToken.None);
         }
@@ -285,7 +285,7 @@ namespace System.Linq
         public static Task<long?> Max(this IAsyncEnumerable<long?> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Max(source, CancellationToken.None);
         }
@@ -293,7 +293,7 @@ namespace System.Linq
         public static Task<double?> Max(this IAsyncEnumerable<double?> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Max(source, CancellationToken.None);
         }
@@ -301,7 +301,7 @@ namespace System.Linq
         public static Task<float?> Max(this IAsyncEnumerable<float?> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Max(source, CancellationToken.None);
         }
@@ -309,7 +309,7 @@ namespace System.Linq
         public static Task<decimal?> Max(this IAsyncEnumerable<decimal?> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Max(source, CancellationToken.None);
         }
@@ -317,7 +317,7 @@ namespace System.Linq
         public static Task<TSource> Max<TSource>(this IAsyncEnumerable<TSource> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Max(source, CancellationToken.None);
         }
@@ -325,9 +325,9 @@ namespace System.Linq
         public static Task<int> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, int> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Max(source, selector, CancellationToken.None);
         }
@@ -335,9 +335,9 @@ namespace System.Linq
         public static Task<long> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, long> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Max(source, selector, CancellationToken.None);
         }
@@ -345,9 +345,9 @@ namespace System.Linq
         public static Task<double> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, double> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Max(source, selector, CancellationToken.None);
         }
@@ -355,9 +355,9 @@ namespace System.Linq
         public static Task<float> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, float> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Max(source, selector, CancellationToken.None);
         }
@@ -365,9 +365,9 @@ namespace System.Linq
         public static Task<decimal> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, decimal> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Max(source, selector, CancellationToken.None);
         }
@@ -375,9 +375,9 @@ namespace System.Linq
         public static Task<int?> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, int?> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Max(source, selector, CancellationToken.None);
         }
@@ -385,9 +385,9 @@ namespace System.Linq
         public static Task<long?> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, long?> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Max(source, selector, CancellationToken.None);
         }
@@ -395,9 +395,9 @@ namespace System.Linq
         public static Task<double?> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, double?> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Max(source, selector, CancellationToken.None);
         }
@@ -405,9 +405,9 @@ namespace System.Linq
         public static Task<float?> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, float?> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Max(source, selector, CancellationToken.None);
         }
@@ -415,9 +415,9 @@ namespace System.Linq
         public static Task<decimal?> Max<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, decimal?> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Max(source, selector, CancellationToken.None);
         }
@@ -425,9 +425,9 @@ namespace System.Linq
         public static Task<TResult> Max<TSource, TResult>(this IAsyncEnumerable<TSource> source, Func<TSource, TResult> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Max(source, selector, CancellationToken.None);
         }
@@ -436,9 +436,9 @@ namespace System.Linq
         public static Task<TSource> Max<TSource>(this IAsyncEnumerable<TSource> source, IComparer<TSource> comparer)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (comparer == null)
-                throw new ArgumentNullException("comparer");
+                throw new ArgumentNullException(nameof(comparer));
 
             return source.Max(comparer, CancellationToken.None);
         }
@@ -446,9 +446,9 @@ namespace System.Linq
         public static Task<IList<TSource>> MaxBy<TSource, TKey>(this IAsyncEnumerable<TSource> source, Func<TSource, TKey> keySelector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (keySelector == null)
-                throw new ArgumentNullException("keySelector");
+                throw new ArgumentNullException(nameof(keySelector));
 
             return source.MaxBy(keySelector, CancellationToken.None);
         }
@@ -456,11 +456,11 @@ namespace System.Linq
         public static Task<IList<TSource>> MaxBy<TSource, TKey>(this IAsyncEnumerable<TSource> source, Func<TSource, TKey> keySelector, IComparer<TKey> comparer)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (keySelector == null)
-                throw new ArgumentNullException("keySelector");
+                throw new ArgumentNullException(nameof(keySelector));
             if (comparer == null)
-                throw new ArgumentNullException("comparer");
+                throw new ArgumentNullException(nameof(comparer));
 
             return source.MaxBy(keySelector, comparer, CancellationToken.None);
         }

Ix.NET/Source/System.Interactive.Async/Min.cs

@@ -15,9 +15,9 @@ namespace System.Linq
         public static Task<decimal?> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, decimal?> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Min(source, selector, CancellationToken.None);
         }
@@ -25,9 +25,9 @@ namespace System.Linq
         public static Task<TResult> Min<TSource, TResult>(this IAsyncEnumerable<TSource> source, Func<TSource, TResult> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Min(source, selector, CancellationToken.None);
         }
@@ -46,7 +46,7 @@ namespace System.Linq
         public static Task<int> Min(this IAsyncEnumerable<int> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Min(source, CancellationToken.None);
         }
@@ -54,7 +54,7 @@ namespace System.Linq
         public static Task<long> Min(this IAsyncEnumerable<long> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Min(source, CancellationToken.None);
         }
@@ -62,7 +62,7 @@ namespace System.Linq
         public static Task<double> Min(this IAsyncEnumerable<double> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Min(source, CancellationToken.None);
         }
@@ -70,7 +70,7 @@ namespace System.Linq
         public static Task<float> Min(this IAsyncEnumerable<float> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Min(source, CancellationToken.None);
         }
@@ -78,7 +78,7 @@ namespace System.Linq
         public static Task<decimal> Min(this IAsyncEnumerable<decimal> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Min(source, CancellationToken.None);
         }
@@ -86,7 +86,7 @@ namespace System.Linq
         public static Task<int?> Min(this IAsyncEnumerable<int?> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Min(source, CancellationToken.None);
         }
@@ -94,7 +94,7 @@ namespace System.Linq
         public static Task<long?> Min(this IAsyncEnumerable<long?> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Min(source, CancellationToken.None);
         }
@@ -102,7 +102,7 @@ namespace System.Linq
         public static Task<double?> Min(this IAsyncEnumerable<double?> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Min(source, CancellationToken.None);
         }
@@ -110,7 +110,7 @@ namespace System.Linq
         public static Task<float?> Min(this IAsyncEnumerable<float?> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Min(source, CancellationToken.None);
         }
@@ -118,7 +118,7 @@ namespace System.Linq
         public static Task<decimal?> Min(this IAsyncEnumerable<decimal?> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Min(source, CancellationToken.None);
         }
@@ -126,7 +126,7 @@ namespace System.Linq
         public static Task<TSource> Min<TSource>(this IAsyncEnumerable<TSource> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Min(source, CancellationToken.None);
         }
@@ -134,9 +134,9 @@ namespace System.Linq
         public static Task<int> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, int> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Min(source, selector, CancellationToken.None);
         }
@@ -144,9 +144,9 @@ namespace System.Linq
         public static Task<long> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, long> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Min(source, selector, CancellationToken.None);
         }
@@ -154,9 +154,9 @@ namespace System.Linq
         public static Task<double> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, double> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Min(source, selector, CancellationToken.None);
         }
@@ -164,9 +164,9 @@ namespace System.Linq
         public static Task<float> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, float> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Min(source, selector, CancellationToken.None);
         }
@@ -174,9 +174,9 @@ namespace System.Linq
         public static Task<decimal> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, decimal> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Min(source, selector, CancellationToken.None);
         }
@@ -184,9 +184,9 @@ namespace System.Linq
         public static Task<int?> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, int?> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Min(source, selector, CancellationToken.None);
         }
@@ -194,9 +194,9 @@ namespace System.Linq
         public static Task<long?> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, long?> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Min(source, selector, CancellationToken.None);
         }
@@ -204,9 +204,9 @@ namespace System.Linq
         public static Task<double?> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, double?> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Min(source, selector, CancellationToken.None);
         }
@@ -404,9 +404,9 @@ namespace System.Linq
         public static Task<TSource> Min<TSource>(this IAsyncEnumerable<TSource> source, IComparer<TSource> comparer)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (comparer == null)
-                throw new ArgumentNullException("comparer");
+                throw new ArgumentNullException(nameof(comparer));
 
             return source.Min(comparer, CancellationToken.None);
         }
@@ -437,9 +437,9 @@ namespace System.Linq
         public static Task<float?> Min<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, float?> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Min(source, selector, CancellationToken.None);
         }
@@ -447,9 +447,9 @@ namespace System.Linq
         public static Task<IList<TSource>> MinBy<TSource, TKey>(this IAsyncEnumerable<TSource> source, Func<TSource, TKey> keySelector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (keySelector == null)
-                throw new ArgumentNullException("keySelector");
+                throw new ArgumentNullException(nameof(keySelector));
 
             return source.MinBy(keySelector, CancellationToken.None);
         }
@@ -457,11 +457,11 @@ namespace System.Linq
         public static Task<IList<TSource>> MinBy<TSource, TKey>(this IAsyncEnumerable<TSource> source, Func<TSource, TKey> keySelector, IComparer<TKey> comparer)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (keySelector == null)
-                throw new ArgumentNullException("keySelector");
+                throw new ArgumentNullException(nameof(keySelector));
             if (comparer == null)
-                throw new ArgumentNullException("comparer");
+                throw new ArgumentNullException(nameof(comparer));
 
             return source.MinBy(keySelector, comparer, CancellationToken.None);
         }

Ix.NET/Source/System.Interactive.Async/SequenceEqual.cs

@@ -15,11 +15,11 @@ namespace System.Linq
         public static Task<bool> SequenceEqual<TSource>(this IAsyncEnumerable<TSource> first, IAsyncEnumerable<TSource> second, IEqualityComparer<TSource> comparer)
         {
             if (first == null)
-                throw new ArgumentNullException("first");
+                throw new ArgumentNullException(nameof(first));
             if (second == null)
-                throw new ArgumentNullException("second");
+                throw new ArgumentNullException(nameof(second));
             if (comparer == null)
-                throw new ArgumentNullException("comparer");
+                throw new ArgumentNullException(nameof(comparer));
 
             return SequenceEqual(first, second, comparer, CancellationToken.None);
         }
@@ -27,9 +27,9 @@ namespace System.Linq
         public static Task<bool> SequenceEqual<TSource>(this IAsyncEnumerable<TSource> first, IAsyncEnumerable<TSource> second)
         {
             if (first == null)
-                throw new ArgumentNullException("first");
+                throw new ArgumentNullException(nameof(first));
             if (second == null)
-                throw new ArgumentNullException("second");
+                throw new ArgumentNullException(nameof(second));
 
             return SequenceEqual(first, second, CancellationToken.None);
         }

Ix.NET/Source/System.Interactive.Async/Single.cs

@@ -15,7 +15,7 @@ namespace System.Linq
         public static Task<TSource> Single<TSource>(this IAsyncEnumerable<TSource> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Single(source, CancellationToken.None);
         }
@@ -23,9 +23,9 @@ namespace System.Linq
         public static Task<TSource> Single<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, bool> predicate)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (predicate == null)
-                throw new ArgumentNullException("predicate");
+                throw new ArgumentNullException(nameof(predicate));
 
             return Single(source, predicate, CancellationToken.None);
         }
@@ -53,7 +53,7 @@ namespace System.Linq
         public static Task<TSource> SingleOrDefault<TSource>(this IAsyncEnumerable<TSource> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return SingleOrDefault(source, CancellationToken.None);
         }
@@ -61,9 +61,9 @@ namespace System.Linq
         public static Task<TSource> SingleOrDefault<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, bool> predicate)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (predicate == null)
-                throw new ArgumentNullException("predicate");
+                throw new ArgumentNullException(nameof(predicate));
 
             return SingleOrDefault(source, predicate, CancellationToken.None);
         }

Ix.NET/Source/System.Interactive.Async/Sum.cs

@@ -184,7 +184,7 @@ namespace System.Linq
         public static Task<int> Sum(this IAsyncEnumerable<int> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Sum(source, CancellationToken.None);
         }
@@ -192,7 +192,7 @@ namespace System.Linq
         public static Task<long> Sum(this IAsyncEnumerable<long> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Sum(source, CancellationToken.None);
         }
@@ -200,7 +200,7 @@ namespace System.Linq
         public static Task<double> Sum(this IAsyncEnumerable<double> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Sum(source, CancellationToken.None);
         }
@@ -208,7 +208,7 @@ namespace System.Linq
         public static Task<float> Sum(this IAsyncEnumerable<float> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Sum(source, CancellationToken.None);
         }
@@ -216,7 +216,7 @@ namespace System.Linq
         public static Task<decimal> Sum(this IAsyncEnumerable<decimal> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Sum(source, CancellationToken.None);
         }
@@ -224,7 +224,7 @@ namespace System.Linq
         public static Task<int?> Sum(this IAsyncEnumerable<int?> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Sum(source, CancellationToken.None);
         }
@@ -232,7 +232,7 @@ namespace System.Linq
         public static Task<long?> Sum(this IAsyncEnumerable<long?> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Sum(source, CancellationToken.None);
         }
@@ -240,7 +240,7 @@ namespace System.Linq
         public static Task<double?> Sum(this IAsyncEnumerable<double?> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Sum(source, CancellationToken.None);
         }
@@ -248,7 +248,7 @@ namespace System.Linq
         public static Task<float?> Sum(this IAsyncEnumerable<float?> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Sum(source, CancellationToken.None);
         }
@@ -256,7 +256,7 @@ namespace System.Linq
         public static Task<decimal?> Sum(this IAsyncEnumerable<decimal?> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return Sum(source, CancellationToken.None);
         }
@@ -264,9 +264,9 @@ namespace System.Linq
         public static Task<int> Sum<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, int> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Sum(source, selector, CancellationToken.None);
         }
@@ -274,9 +274,9 @@ namespace System.Linq
         public static Task<long> Sum<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, long> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Sum(source, selector, CancellationToken.None);
         }
@@ -284,9 +284,9 @@ namespace System.Linq
         public static Task<double> Sum<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, double> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Sum(source, selector, CancellationToken.None);
         }
@@ -294,9 +294,9 @@ namespace System.Linq
         public static Task<float> Sum<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, float> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Sum(source, selector, CancellationToken.None);
         }
@@ -304,9 +304,9 @@ namespace System.Linq
         public static Task<decimal> Sum<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, decimal> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Sum(source, selector, CancellationToken.None);
         }
@@ -314,9 +314,9 @@ namespace System.Linq
         public static Task<int?> Sum<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, int?> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Sum(source, selector, CancellationToken.None);
         }
@@ -324,9 +324,9 @@ namespace System.Linq
         public static Task<long?> Sum<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, long?> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Sum(source, selector, CancellationToken.None);
         }
@@ -334,9 +334,9 @@ namespace System.Linq
         public static Task<double?> Sum<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, double?> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Sum(source, selector, CancellationToken.None);
         }
@@ -344,9 +344,9 @@ namespace System.Linq
         public static Task<float?> Sum<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, float?> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Sum(source, selector, CancellationToken.None);
         }
@@ -354,9 +354,9 @@ namespace System.Linq
         public static Task<decimal?> Sum<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, decimal?> selector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (selector == null)
-                throw new ArgumentNullException("selector");
+                throw new ArgumentNullException(nameof(selector));
 
             return Sum(source, selector, CancellationToken.None);
         }

Ix.NET/Source/System.Interactive.Async/ToCollection.cs

@@ -15,7 +15,7 @@ namespace System.Linq
         public static Task<TSource[]> ToArray<TSource>(this IAsyncEnumerable<TSource> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return ToArray(source, CancellationToken.None);
         }
@@ -35,13 +35,13 @@ namespace System.Linq
         public static Task<Dictionary<TKey, TElement>> ToDictionary<TSource, TKey, TElement>(this IAsyncEnumerable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector, IEqualityComparer<TKey> comparer)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (keySelector == null)
-                throw new ArgumentNullException("keySelector");
+                throw new ArgumentNullException(nameof(keySelector));
             if (elementSelector == null)
-                throw new ArgumentNullException("elementSelector");
+                throw new ArgumentNullException(nameof(elementSelector));
             if (comparer == null)
-                throw new ArgumentNullException("comparer");
+                throw new ArgumentNullException(nameof(comparer));
 
             return ToDictionary(source, keySelector, elementSelector, comparer, CancellationToken.None);
         }
@@ -49,11 +49,11 @@ namespace System.Linq
         public static Task<Dictionary<TKey, TElement>> ToDictionary<TSource, TKey, TElement>(this IAsyncEnumerable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (keySelector == null)
-                throw new ArgumentNullException("keySelector");
+                throw new ArgumentNullException(nameof(keySelector));
             if (elementSelector == null)
-                throw new ArgumentNullException("elementSelector");
+                throw new ArgumentNullException(nameof(elementSelector));
 
             return ToDictionary(source, keySelector, elementSelector, CancellationToken.None);
         }
@@ -61,11 +61,11 @@ namespace System.Linq
         public static Task<Dictionary<TKey, TSource>> ToDictionary<TSource, TKey>(this IAsyncEnumerable<TSource> source, Func<TSource, TKey> keySelector, IEqualityComparer<TKey> comparer)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (keySelector == null)
-                throw new ArgumentNullException("keySelector");
+                throw new ArgumentNullException(nameof(keySelector));
             if (comparer == null)
-                throw new ArgumentNullException("comparer");
+                throw new ArgumentNullException(nameof(comparer));
 
             return ToDictionary(source, keySelector, comparer, CancellationToken.None);
         }
@@ -73,9 +73,9 @@ namespace System.Linq
         public static Task<Dictionary<TKey, TSource>> ToDictionary<TSource, TKey>(this IAsyncEnumerable<TSource> source, Func<TSource, TKey> keySelector)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
             if (keySelector == null)
-                throw new ArgumentNullException("keySelector");
+                throw new ArgumentNullException(nameof(keySelector));
 
             return ToDictionary(source, keySelector, CancellationToken.None);
         }
@@ -135,7 +135,7 @@ namespace System.Linq
         public static Task<List<TSource>> ToList<TSource>(this IAsyncEnumerable<TSource> source)
         {
             if (source == null)
-                throw new ArgumentNullException("source");
+                throw new ArgumentNullException(nameof(source));
 
             return ToList(source, CancellationToken.None);
         }