Show real time database changes in browser using signalr asp net core and sql d

Introduction

ASP.NET is a popular programming language used for building web applications. One common requirement in web development is to show real-time database changes in the browser. This can be achieved using SignalR, ASP.NET Core, and SQL Server.

up the Environment

Before we dive into the code, let's make sure we have the necessary environment set up. We need to have Visual Studio installed, along with the ASP.NET Core SDK. Additionally, we need a SQL Server database to store our data.

Creating the ASP.NET Core Project

Let's by creating a new ASP.NET Core project. Open Visual Studio and select “Create a new project”. Choose the ASP.NET Core Web Application template and give your project a name. Select the desired options and click “Create”.

Once the project is , open the “Startup.cs” file. In the “ConfigureServices” method, add the following code to enable SignalR:


services.AddSignalR();

Next, in the “Configure” method, add the following code to enable SignalR endpoints:


app.UseEndpoints(endpoints =>
{
    endpoints.MapHub("/databaseChangesHub");
});

Creating the SignalR Hub

Now let's create a SignalR hub that will the real-time updates. Right-click on the project in the Solution Explorer and select “Add” > “New ”. Name the folder “Hubs”. Right-click on the “Hubs” folder and select “Add” > “Class”. Name the class “DatabaseChangesHub.cs”.

In the “DatabaseChangesHub.cs” file, add the following code:


using Microsoft.AspNetCore.SignalR;
using System.Threading.;

 YourNamespace.Hubs
{
    public class DatabaseChangesHub : Hub
    {
        public async Task SendDatabaseChange( message)
        {
            await Clients.All.SendAsync("ReceiveDatabaseChange", message);
        }
    }
}

Updating the Database

Now let's update the database and send real-time updates to the browser. In your project, create a new SQL Server database and add a table “Changes” with a column named “Message”.

In your ASP.NET Core project, open the “HomeController.cs” file. In the “Index” action method, add the following code to listen for database changes:


using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.SignalR;
using System.Threading.Tasks;
using YourNamespace.Hubs;

namespace YourNamespace.Controllers
{
    public class HomeController : Controller
    {
        private readonly IHubContext _hubContext;

        public HomeController(IHubContext hubContext)
        {
            _hubContext = hubContext;
        }

        public IActionResult Index()
        {
            // Listen for database changes and send updates to the browser
            Task.Run(async () =>
            {
                while (true)
                {
                    // Check for database changes
                    string message = GetDatabaseChange();

                    // Send update to the browser
                    await _hubContext.Clients.All.SendAsync("ReceiveDatabaseChange", message);

                    // Delay for a few seconds before checking again
                    await Task.Delay(5000);
                }
            });

            return View();
        }

        private string GetDatabaseChange()
        {
            // Code to retrieve the latest database change
            // Return the message as a string
        }
    }
}

Displaying Real-Time Updates in the Browser

Finally, let's display the real-time updates in the browser. Open the “Index.cshtml” file and add the following code:


@{
    ViewData["Title"] = "Real-Time Database Changes";
}

Real-Time Database Changes

@ Scripts { }

Conclusion

In this article, we have explored how to show real-time database changes in the browser using SignalR, ASP.NET Core, and SQL Server. By following the steps outlined above, you can implement this functionality in your ASP.NET web application. Real-time updates can greatly enhance the user experience and provide timely information to your users.

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