AsyncEnumerator 1.1.0

.NET Framework
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dotnet add package AsyncEnumerator --version 1.1.0
NuGet\Install-Package AsyncEnumerator -Version 1.1.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<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
#r "nuget: AsyncEnumerator, 1.1.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. 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

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 Compatible and additional computed target framework versions.
.NET Framework net is compatible. 
Compatible target framework(s)
Additional computed target framework(s)
Learn more about Target Frameworks and .NET Standard.

This package has no dependencies.

NuGet packages (45)

Showing the top 5 NuGet packages that depend on AsyncEnumerator:

Package Downloads

Package Description


Package Description


.Net Core Utilities methods


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Provides interfaces, abstractions and common functions which is the essence of Carbon Kit.

GitHub repositories (10)

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

Repository Stars
TeamFiltration is a cross-platform framework for enumerating, spraying, exfiltrating, and backdooring O365 AAD accounts
Somewhat modular text2image GUI, initially just for Stable Diffusion
Open source utility to manage Steam, Origin and Uplay libraries in ease of use with multi library support
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Secure, Modern, Fully-Featured, All-In-One Cross-Architecture & Cross-Platform DNS Server Using .NET 7.0
Version Downloads Last updated
4.0.2 11,764,756 12/4/2019
4.0.1 146,027 10/22/2019
4.0.0 43,321 10/18/2019
3.1.0 115,687 9/23/2019
2.2.2 2,034,757 1/27/2019
2.2.1 1,407,246 5/29/2018
2.2.0 38,636 5/18/2018
2.1.1 560,919 1/20/2018
2.1.0 313,048 5/22/2017
2.0.1 54,158 2/13/2017
1.5.0 4,922 2/12/2017
1.4.2 2,579 2/6/2017
1.3.0 2,788 1/20/2017
1.2.3 8,021 1/6/2017
1.2.2 3,241 12/11/2016
1.2.1 1,790 12/10/2016
1.2.0 20,792 11/29/2016
1.1.3 1,924 11/28/2016
1.1.2 50,253 8/29/2016
1.0.3 5,175 4/28/2016

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