SignalR Hubs

Syntax

public class MyHub : Hub
{
    public void SendMessage(string user, string message)
    {
        Clients.All.SendAsync("ReceiveMessage", user, message);
    }
}

Example

public class ChatController : Controller
{
    private readonly IHubContext<MyHub> _hubContext;

    public ChatController(IHubContext<MyHub> hubContext)
    {
        _hubContext = hubContext;
    }

    public async Task<IActionResult> SendMessage(string user, string message)
    {
        await _hubContext.Clients.All.SendAsync("ReceiveMessage", user, message);
        return Ok();
    }
}

Explanation

SignalR Hubs provide a high-level messaging API for real-time communication between clients and servers. Hubs allow clients to call server-side methods, and vice versa, using a simple and intuitive syntax. At the core of Hubs is the concept of groups, which allow clients to be organized into logical groups based on any criteria. Hubs provide built-in support for managing connections, and can automatically scale to support large numbers of clients.

Use

SignalR Hubs are often used in real-time web applications where live updates are required, such as chat applications, real-time analytics, and multiplayer games. By using Hubs, developers can eliminate the need for manual low-level WebSocket programming, and focus on the core functionality of their application.

Important Points

• SignalR Hubs are a high-level messaging API for real-time communication
• Hubs provide a simple and intuitive syntax for calling server-side methods
• Hubs support the concept of groups for organizing clients
• Hubs provide built-in support for managing connections and scaling to large numbers of clients

Summary

SignalR Hubs provide a powerful API for real-time communication between clients and servers. With built-in support for managing connections and scaling to large numbers of clients, Hubs are an essential tool for developers building real-time web applications.