IAsyncEnumerable Explained - Async Streams in .NET

Interview-Ready Summary: Understanding IAsyncEnumerable<T> in C#

What is IAsyncEnumerable<T>?

IAsyncEnumerable<T> is an interface introduced in .NET Core 3.0 that allows asynchronous iteration over a sequence of items, one at a time as they become available. This is particularly useful for handling large datasets or streams where loading everything into memory upfront would be impractical.

Key Concepts

1. Producer Methods:

   • Producers are methods that return IAsyncEnumerable<T> and use yield return to produce items asynchronously.
   • Example:

     csharp
      
     1public async IAsyncEnumerable<int> GenerateNumbers([EnumeratorCancellation] CancellationToken cancellationToken)
     2{
     3    for (int i = 0; ; i++)
     4    {
     5        await Task.Delay(100, cancellationToken);
     6        yield return i;
     7    }
     8}

2. Consumer Methods:

   • Consumers use await foreach to iterate over the items produced by an IAsyncEnumerable<T>.
   • Example:

     csharp
      
     1public async Task ConsumeNumbers(IAsyncEnumerable<int> numbers)
     2{
     3    await foreach (var number in numbers.WithCancellation

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