AsyncEnumerator 1.1.0

.NET Framework
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Install-Package AsyncEnumerator -Version 1.1.0
dotnet add package AsyncEnumerator --version 1.1.0
<PackageReference Include="AsyncEnumerator" Version="1.1.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add AsyncEnumerator --version 1.1.0
The NuGet Team does not provide support for this client. Please contact its maintainers for support.
#r "nuget: AsyncEnumerator, 1.1.0"
#r directive can be used in F# Interactive, C# scripting and .NET Interactive. Copy this into the interactive tool or source code of the script to reference the package.
// Install AsyncEnumerator as a Cake Addin
#addin nuget:?package=AsyncEnumerator&version=1.1.0

// Install AsyncEnumerator as a Cake Tool
#tool nuget:?package=AsyncEnumerator&version=1.1.0
The NuGet Team does not provide support for this client. Please contact its maintainers for support.

Introduces IAsyncEnumerable, IAsyncEnumerator, ForEachAsync(), and ParallelForEachAsync()


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).


using System.Collections.Async;

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:

   // 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()
 // NOTE: IAsyncEnumerable is derived from IEnumerable, so you can use either
 var enumerableCollection = ProduceAsyncNumbers(start: 1, end: 10);
 //var enumerableCollection = ProduceNumbers(start: 1, end: 10);

 foreach (var number in enumerableCollection) {

Product Versions
.NET Framework net
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This package has no dependencies.

NuGet packages (36)

Showing the top 5 NuGet packages that depend on AsyncEnumerator:

Package Downloads

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Package Description


Package Description


Package Description

GitHub repositories (8)

Showing the top 5 popular GitHub repositories that depend on AsyncEnumerator:

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Version Downloads Last updated
4.0.2 4,164,739 12/4/2019
4.0.1 94,505 10/22/2019
4.0.0 11,152 10/18/2019
3.1.0 78,685 9/23/2019
2.2.2 1,538,218 1/27/2019
2.2.1 1,291,191 5/29/2018
2.2.0 28,805 5/18/2018
2.1.1 158,700 1/20/2018
2.1.0 280,328 5/22/2017
2.0.1 51,359 2/13/2017
1.5.0 3,955 2/12/2017
1.4.2 1,590 2/6/2017
1.3.0 1,857 1/20/2017
1.2.3 6,854 1/6/2017
1.2.2 2,186 12/11/2016
1.2.1 842 12/10/2016
1.2.0 19,241 11/29/2016
1.1.3 909 11/28/2016
1.1.2 45,428 8/29/2016
1.0.3 3,705 4/28/2016

Add ParallelForEachAsync extension methods for IEnumerable<T> and IAsyncEnumerable<T> in System.Collections.Async namespace.