Splitting Count and LongCount.

Ix.NET/Source/System.Linq.Async/System/Linq/Operators/Count.cs

@@ -75,61 +75,5 @@ namespace System.Linq
 
             return Count(source, predicate, CancellationToken.None);
         }
-
-        public static Task<long> LongCount<TSource>(this IAsyncEnumerable<TSource> source, CancellationToken cancellationToken)
-        {
-            if (source == null)
-                throw new ArgumentNullException(nameof(source));
-
-            return source.Aggregate(0L, (c, _) => checked(c + 1), cancellationToken);
-        }
-
-        public static Task<long> LongCount<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, bool> predicate, CancellationToken cancellationToken)
-        {
-            if (source == null)
-                throw new ArgumentNullException(nameof(source));
-            if (predicate == null)
-                throw new ArgumentNullException(nameof(predicate));
-
-            return source.Where(predicate).Aggregate(0L, (c, _) => checked(c + 1), cancellationToken);
-        }
-
-        public static Task<long> LongCount<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<bool>> predicate, CancellationToken cancellationToken)
-        {
-            if (source == null)
-                throw new ArgumentNullException(nameof(source));
-            if (predicate == null)
-                throw new ArgumentNullException(nameof(predicate));
-
-            return source.Where(predicate).Aggregate(0L, (c, _) => checked(c + 1), cancellationToken);
-        }
-
-        public static Task<long> LongCount<TSource>(this IAsyncEnumerable<TSource> source)
-        {
-            if (source == null)
-                throw new ArgumentNullException(nameof(source));
-
-            return LongCount(source, CancellationToken.None);
-        }
-
-        public static Task<long> LongCount<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, bool> predicate)
-        {
-            if (source == null)
-                throw new ArgumentNullException(nameof(source));
-            if (predicate == null)
-                throw new ArgumentNullException(nameof(predicate));
-
-            return LongCount(source, predicate, CancellationToken.None);
-        }
-
-        public static Task<long> LongCount<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<bool>> predicate)
-        {
-            if (source == null)
-                throw new ArgumentNullException(nameof(source));
-            if (predicate == null)
-                throw new ArgumentNullException(nameof(predicate));
-
-            return LongCount(source, predicate, CancellationToken.None);
-        }
     }
 }

Ix.NET/Source/System.Linq.Async/System/Linq/Operators/LongCount.cs

@@ -0,0 +1,69 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information. 
+
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace System.Linq
+{
+    public static partial class AsyncEnumerable
+    {
+        public static Task<long> LongCount<TSource>(this IAsyncEnumerable<TSource> source, CancellationToken cancellationToken)
+        {
+            if (source == null)
+                throw new ArgumentNullException(nameof(source));
+
+            return source.Aggregate(0L, (c, _) => checked(c + 1), cancellationToken);
+        }
+
+        public static Task<long> LongCount<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, bool> predicate, CancellationToken cancellationToken)
+        {
+            if (source == null)
+                throw new ArgumentNullException(nameof(source));
+            if (predicate == null)
+                throw new ArgumentNullException(nameof(predicate));
+
+            return source.Where(predicate).Aggregate(0L, (c, _) => checked(c + 1), cancellationToken);
+        }
+
+        public static Task<long> LongCount<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<bool>> predicate, CancellationToken cancellationToken)
+        {
+            if (source == null)
+                throw new ArgumentNullException(nameof(source));
+            if (predicate == null)
+                throw new ArgumentNullException(nameof(predicate));
+
+            return source.Where(predicate).Aggregate(0L, (c, _) => checked(c + 1), cancellationToken);
+        }
+
+        public static Task<long> LongCount<TSource>(this IAsyncEnumerable<TSource> source)
+        {
+            if (source == null)
+                throw new ArgumentNullException(nameof(source));
+
+            return LongCount(source, CancellationToken.None);
+        }
+
+        public static Task<long> LongCount<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, bool> predicate)
+        {
+            if (source == null)
+                throw new ArgumentNullException(nameof(source));
+            if (predicate == null)
+                throw new ArgumentNullException(nameof(predicate));
+
+            return LongCount(source, predicate, CancellationToken.None);
+        }
+
+        public static Task<long> LongCount<TSource>(this IAsyncEnumerable<TSource> source, Func<TSource, Task<bool>> predicate)
+        {
+            if (source == null)
+                throw new ArgumentNullException(nameof(source));
+            if (predicate == null)
+                throw new ArgumentNullException(nameof(predicate));
+
+            return LongCount(source, predicate, CancellationToken.None);
+        }
+    }
+}