Building Real-Time Dashboards with SignalR and .NET 8

Introduction

Real-time communication is a critical requirement in modern web applications. Whether it's live dashboards, chat systems, or collaborative tools, users expect instant updates without refreshing the page. SignalR in .NET 8 makes this remarkably simple.

What is SignalR?

SignalR is a library for ASP.NET that simplifies adding real-time web functionality to applications. It uses WebSockets when available and gracefully falls back to other transport mechanisms like Server-Sent Events or Long Polling.

Setting Up a SignalR Hub

The hub is the core component — it handles connections and message routing:

using Microsoft.AspNetCore.SignalR;

public class DashboardHub : Hub
{
    public async Task SendMetricUpdate(string metric, double value)
    {
        await Clients.All.SendAsync("ReceiveMetric", metric, value);
    }
}

Register the hub in your Program.cs:

builder.Services.AddSignalR();
app.MapHub<DashboardHub>("/dashboardHub");

Client-Side Integration

On the frontend, connect to the hub using the SignalR JavaScript client:

import { HubConnectionBuilder } from '@microsoft/signalr';

const connection = new HubConnectionBuilder()
    .withUrl('/dashboardHub')
    .withAutomaticReconnect()
    .build();

connection.on('ReceiveMetric', (metric, value) => {
    updateChart(metric, value);
});

await connection.start();

Scaling with Azure SignalR Service

For production workloads, Azure SignalR Service handles connection management and scaling automatically. Simply add the connection string and switch  
to Azure mode — no code changes needed on the hub side.

Conclusion

SignalR in .NET 8 provides a powerful yet simple way to add real-time capabilities to your applications. Combined with Azure SignalR Service, it      
scales effortlessly to handle thousands of concurrent connections.

## Implementation
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