// // 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; using System.Collections.Generic; using System.Linq; using System.Threading.Tasks; namespace System.Linq { public static partial class AsyncEnumerable { public static IAsyncEnumerable Cast(this IAsyncEnumerable source) { if (source == null) throw new ArgumentNullException(nameof(source)); return source.Select(x => (TResult)x); } public static IAsyncEnumerable OfType(this IAsyncEnumerable source) { if (source == null) throw new ArgumentNullException(nameof(source)); return source.Where(x => x is TType) .Cast(); } } }