Topic 11. Real-time messaging with ASP.NET Core SignalR

Goal: get to know the ways of exchanging data in real time and the architecture of ASP.NET Core SignalR; learn to create hubs, strongly typed hubs, and groups, and to handle client connections and disconnections; master .NET clients for the console and Windows Forms, automatic reconnection, sending messages from background services and REST endpoints through IHubContext, and data streaming.

Lecture contents

1. Architecture, the hub, and the .NET client — Real-time data exchange · ASP.NET Core SignalR architecture · The server: a hub and its methods · The .NET client
2. Groups, typed hubs, and forms — Connections, groups, and strongly typed hubs · A Windows Forms client
3. Reconnection and sending messages — The connection lifecycle and reconnection · Sending messages from outside a hub
4. Streaming, MessagePack, and scaling — Data streaming · MessagePack, the JavaScript client, scaling, and diagnostics
5. Common mistakes — Common mistakes

Practice and review

• Practice — 3 worked examples with complete code
• Tasks — 30 variants, each with tasks at three difficulty levels
• Summary — conclusions, self-check questions, and useful links