ASP.NET SignalR – Hubs

 

Hubs Concept

Convention: 慣例，常規，習俗，公約，協定。For example, Coding Convention.

 

Programming Model

Context: 文章脈絡，事件的來龍去脈

 

Demo

 

Hubs Protocol

 

 

1. .NET 4.0 doesn’t support WebSocket, so it will use SSE (Server Send Event) as second priority

2. .NET 4.5 support WebSocket, so it will directly use it as first priority

 

Step 1: Negotiate, try WebSockets

Step 2.1: Connect, with WebSockets, but fail

Step 2.2: Connect again, with SSE, success

 

If change <httpRuntime targetFramework=”4.5” /> in web.config, WebSocket will be used

 

Force using LongPolling as transport negociation

 

Pushing Data: Clients

 

Clients.Others

Clients.AllExcept(Context.ConnectionId)

above 2 are equal too.

 

Pushing Data: Groups

 

Demo – JoinRoom(), SendMessageToRoom()

 

Hub Lifecycle

 

Demo

New a class, MonitorHub.cs

GlobalHost.ConnectionManager.GetHubContext<T>();

 

Summary