Microsoft.Bcl.AsyncInterfaces 10.0.0-preview.1.25080.5

About

As of C# 8, the C# language has support for producing and consuming asynchronous iterators. The library types in support of those features are available in .NET Core 3.0 and newer as well as in .NET Standard 2.1. This library provides the necessary definitions of those types to support these language features on .NET Framework and on .NET Standard 2.0. This library is not necessary nor recommended when targeting versions of .NET that include the relevant support.

Key Features

  • Enables the use of C# async iterators on older .NET platforms

How to Use

using System;
using System.Collections.Generic;
using System.Threading.Tasks;

internal static class Program
{
    private static async Task Main()
    {
        Console.WriteLine("Starting...");
        await foreach (var value in GetValuesAsync())
        {
            Console.WriteLine(value);
        }
        Console.WriteLine("Finished!");

        static async IAsyncEnumerable<int> GetValuesAsync()
        {
            for (int i = 0; i < 10; i++)
            {
                await Task.Delay(TimeSpan.FromSeconds(1));
                yield return i;
            }
        }
    }
}

Main Types

The main types provided by this library are:

  • IAsyncEnumerable<T>
  • IAsyncEnumerator<T>
  • IAsyncDisposable<T>

Additional Documentation

Feedback & Contributing

Microsoft.Bcl.AsyncInterfaces is released as open source under the MIT license. Bug reports and contributions are welcome at the GitHub repository.

Showing the top 20 packages that depend on Microsoft.Bcl.AsyncInterfaces.

Packages Downloads
AsyncEnumerator
Introduces IAsyncEnumerable, IAsyncEnumerator, ForEachAsync(), and ParallelForEachAsync() GitHub: https://github.com/Dasync/AsyncEnumerable PROBLEM SPACE Helps to (a) create an element provider, where producing an element can take a lot of time due to dependency on other asynchronous events (e.g. wait handles, network streams), and (b) a consumer that processes those element as soon as they are ready without blocking the thread (the processing is scheduled on a worker thread instead). EXAMPLE using Dasync.Collections; static IAsyncEnumerable<int> ProduceAsyncNumbers(int start, int end) { return new AsyncEnumerable<int>(async yield => { // Just to show that ReturnAsync can be used multiple times await yield.ReturnAsync(start); for (int number = start + 1; number <= end; number++) await yield.ReturnAsync(number); // You can break the enumeration loop with the following call: yield.Break(); // This won't be executed due to the loop break above await yield.ReturnAsync(12345); }); } // Just to compare with synchronous version of enumerator static IEnumerable<int> ProduceNumbers(int start, int end) { yield return start; for (int number = start + 1; number <= end; number++) yield return number; yield break; yield return 12345; } static async Task ConsumeNumbersAsync() { var asyncEnumerableCollection = ProduceAsyncNumbers(start: 1, end: 10); await asyncEnumerableCollection.ForEachAsync(async number => { await Console.Out.WriteLineAsync($"{number}"); }); } // Just to compare with synchronous version of enumeration static void ConsumeNumbers() { var enumerableCollection = ProduceNumbers(start: 1, end: 10); foreach (var number in enumerableCollection) { Console.Out.WriteLine($"{number}"); } }
 8
Azure.Core
This is the implementation of the Azure Client Pipeline
 8
Microsoft.Extensions.DependencyInjection
Default implementation of dependency injection for Microsoft.Extensions.DependencyInjection. When using NuGet 3.x this package requires at least version 3.4.
 8
Microsoft.CodeAnalysis.CSharp.Workspaces
.NET Compiler Platform ("Roslyn") support for analyzing C# projects and solutions. More details at https://aka.ms/roslyn-packages This package was built from the source at https://github.com/dotnet/roslyn/commit/75e79dace86b274327a1afe479228d82a06051a4.
 7
Microsoft.Extensions.Hosting.Abstractions
Hosting and startup abstractions for applications.
 7
Microsoft.CodeAnalysis.Workspaces.Common
A shared package used by the .NET Compiler Platform ("Roslyn") including support for analyzing projects and solutions. Do not install this package manually, it will be added as a prerequisite by other packages that require it. More details at https://aka.ms/roslyn-packages This package was built from the source at https://github.com/dotnet/roslyn/commit/75e79dace86b274327a1afe479228d82a06051a4.
 6
Microsoft.Extensions.Hosting
Hosting and startup infrastructures for applications.
 6
Microsoft.Bcl.TimeProvider
Provides support for system time abstraction primitives for .NET Framework and .NET Standard.
 4
Microsoft.Extensions.Logging.Console
Console logger provider implementation for Microsoft.Extensions.Logging.
 4
Microsoft.Extensions.Logging.EventSource
EventSource/EventListener logger provider implementation for Microsoft.Extensions.Logging.
 4

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.NET Framework 4.6.2

.NET Standard 2.0

.NET Standard 2.1

  • No dependencies.

Version Downloads Last updated
10.0.0-preview.1.25080.5 5 6/3/2025