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What are Async Streams in C# 8.0?
C# 8.0 introduces async streams, which model a streaming source of data. Data streams often retrieve or generate elements asynchronously.
The code that generates the sequence can now use yield return to return elements in a method that was declared with the async modifier.
We can consume an async stream using an await foreach loop.
This below Syntax
static IEnumerable<string> Message(){
yield return "Hello!";
yield return "Hello!";
}
Can be replaced by IAsyncEnumerable
static async IAsyncEnumerable<string> MessageAsync(){
await Task.Delay(2000);
yield return "Hello!";
await Task.Delay(2000);
yield return "Hello!";
}Example
class Program{
public static async Task Main(){
await foreach (var item in MessageAsync()){
System.Console.WriteLine(item);
}
Console.ReadLine();
}
static async IAsyncEnumerable<string> MessageAsync(){
await Task.Delay(2000);
yield return "Hello!";
await Task.Delay(2000);
yield return "Hello!";
}
}Output
Hello! Hello!
Updated on: 19-Aug-2020
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