Blazor SignalR in Blazor Server

Blazor Server is a great technology for building real-time web applications using C# instead of JavaScript. Using SignalR in Blazor Server, we can create real-time web applications that can communicate with the server and update the UI in real-time without requiring the user to refresh the page.

Syntax

To use SignalR in Blazor Server, first, we must include the Microsoft.AspNetCore.SignalR.Client NuGet package and add the following using statement:

using Microsoft.AspNetCore.SignalR.Client;

Then, we can create a SignalR connection using the following code:

var connection = new HubConnectionBuilder()
    .WithUrl("/hubUrl")
    .Build();

Example

var connection = new HubConnectionBuilder()
    .WithUrl("/chatHub")
    .Build();

connection.On<string, string>("ReceiveMessage", (user, message) =>
{
    var encodedMsg = $"{user}: {message}";
    Console.WriteLine(encodedMsg);
});

await connection.StartAsync();

await connection.InvokeAsync("SendMessage", user, message);

In this example, we are creating a SignalR connection to a chat hub. We are registering a callback for the ReceiveMessage event, which will be raised whenever a new message is received. Then, we start the connection and invoke the SendMessage method to send a new message to the chat server.

Output

The output of using SignalR in Blazor Server is a real-time web application that can communicate with the server and update the UI in real-time.

Explanation

SignalR is a library for ASP.NET Core that allows real-time bi-directional communication between the server and the client. By using SignalR in Blazor Server, we can create real-time web applications that can communicate with the server and update the UI in real-time without requiring the user to refresh the page.

Use

Blazor Server applications that require real-time communication between the client and the server can use SignalR to achieve this. SignalR can be used for any real-time communication like chat applications, stock market updates, and more.

Important Points

• Include the Microsoft.AspNetCore.SignalR.Client NuGet package to use SignalR in Blazor Server.
• Create a SignalR connection using the WithUrl method to specify the URL of the hub.
• Register callbacks for events raised by the hub.
• Call methods on the hub using the InvokeAsync method.

Summary

Blazor Server applications can use SignalR to achieve real-time communication between the client and the server. SignalR is a library for ASP.NET Core that allows real-time bi-directional communication between the server and the client. By using SignalR, we can create real-time web applications that can communicate with the server and update the UI in real-time without requiring the user to refresh the page.