AsyncEnumerator 2.2.2

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 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:
   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}");
 }
}

Install-Package AsyncEnumerator -Version 2.2.2

dotnet add package AsyncEnumerator --version 2.2.2

<PackageReference Include="AsyncEnumerator" Version="2.2.2" />

paket add AsyncEnumerator --version 2.2.2

#r "nuget: AsyncEnumerator, 2.2.2"

// Install AsyncEnumerator as a Cake Addin
#addin nuget:?package=AsyncEnumerator&version=2.2.2

// Install AsyncEnumerator as a Cake Tool
#tool nuget:?package=AsyncEnumerator&version=2.2.2

Release Notes

2.2.0: New extension methods: SelectMany, Append, Prepend, OfType, Concat, Distinct, ToDictionaryAsync, ToLookupAsync, AggregateAsync.
2.1.0: New extension methods: Batch, UnionAll, Single, SingleOrDefault, DefaultIfEmpty, Cast.
2.0.0: Revise design of the library: same features, but slight paradigm shift and interface breaking changes.
1.5.0: Add support for .NET Standard, minor improvements.
1.4.2: Add finalizer to AsyncEnumerator and call Dispose in ForEachAsync and ParallelForEachAsync extension methods.
1.4.0: Add new generic type AsyncEnumeratorWithState for performance optimization.
      Now IAsyncEnumerator<T> is covariant.
      Add ForEachAsync, ParallelForeachAsync, and LINQ-style extension methods for IAsyncEnumerator.
1.2.1: New Linq-style extension methods in System.Collections.Async namespace.
1.1.0: Add ParallelForEachAsync extension methods for IEnumerable<T> and IAsyncEnumerable<T> in System.Collections.Async namespace.

Dependencies

This package has no dependencies.

Used By

Version History