The Ultimate Guide for SignalR in ASP.NET Core/

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Server Streaming in SignalR

Server Streaming in SignalR

Learn to add the streaming functionality in SignalR servers.

We'll cover the following...

Introduction

As the name suggests, server streaming works the other way. However, you still need a client involved. The client needs to trigger a server streaming endpoint on the server. Once it’s triggered, it will subscribe to the stream and read messages from it either until no more messages are left or the server disconnects the stream.

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Server streaming
Server streaming

We will now add some server streaming functionality to our clients and the server-side hub. This time, we'll start with the server because it controls the stream.

Adding server streaming capabilities to SignalR Hub

In the LearningHub.cs file inside the SignalRServer project, we'll add the following namespace reference:

using System.Runtime.CompilerServices;

Then, we'll add the following method:

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public async IAsyncEnumerable<string> TriggerStream(
    int jobsCount,
    [EnumeratorCancellation]
    CancellationToken cancellationToken)
{
    for (var i = 0; i < jobsCount; i++)
    {
        cancellationToken.ThrowIfCancellationRequested();
        yield return $"Job {i} executed successfully";
        await Task.Delay(1000, cancellationToken);
    }
}
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