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Home Interviews How can you broadcast a message to all connected clients in SignalR? – MindStick
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1 Answers

Utpal Vishwas
Utpal Vishwas 21 May 2025
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Broadcasting a message to all connected clients in SignalR is straightforward and one of its core features.

How to broadcast to all clients in a SignalR Hub?

Inside your Hub class on the server, you use:

await Clients.All.SendAsync("MethodName", parameters...);
  1. Clients.All targets every connected client.
  2. "MethodName" is the name of the client-side method that will be invoked.
  3. parameters... are the data you want to send.

Example: Broadcasting a chat message to everyone

public class ChatHub : Hub
{
    public async Task SendMessage(string user, string message)
    {
        // Broadcast to all connected clients
        await Clients.All.SendAsync("ReceiveMessage", user, message);
    }
}

On the client side, you listen for "ReceiveMessage":

connection.on("ReceiveMessage", (user, message) => {
    console.log(`${user}: ${message}`);
    // Update UI or perform actions with the message
});

Summary

Action Code snippet
Broadcast message await Clients.All.SendAsync("ReceiveMessage", user, message);
Listen on client connection.on("ReceiveMessage", handlerFunction);

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