SignalR：客户端断开

Question

SignalR如何处理客户端断开连接？如果我陈述如下，我是对的吗？

• SignalR将通过Javascript事件处理检测浏览器页面关闭/刷新，并将相应的数据包发送到服务器（通过持久连接）;
• SignalR不会检测浏览器关闭/网络故障（可能只有超时）。

我的目标是长轮询运输。

我知道this question但我想说清楚一点。

Answer 1

如果用户刷新页面，则将其视为新连接。你是正确的断开是基于超时。

您可以通过执行 SignalR.Hubs.IConnected和 SignalR.Hubs.IDisconnect来处理集线器中的连接/重新连接和断开连接事件。

上面提到SignalR 0.5.x.

从the official documentation（目前为V1.1.3）：

public class ContosoChatHub : Hub 
{ 
    public override Task OnConnected() 
    { 
     // Add your own code here. 
     // For example: in a chat application, record the association between 
     // the current connection ID and user name, and mark the user as online. 
     // After the code in this method completes, the client is informed that 
     // the connection is established; for example, in a JavaScript client, 
     // the start().done callback is executed. 
     return base.OnConnected(); 
    } 

    public override Task OnDisconnected() 
    { 
     // Add your own code here. 
     // For example: in a chat application, mark the user as offline, 
     // delete the association between the current connection id and user name. 
     return base.OnDisconnected(); 
    } 

    public override Task OnReconnected() 
    { 
     // Add your own code here. 
     // For example: in a chat application, you might have marked the 
     // user as offline after a period of inactivity; in that case 
     // mark the user as online again. 
     return base.OnReconnected(); 
    } 
} 

Answer 2

在SignalR 1.0中，SignalR.Hubs.IConnected和SignalR.Hubs.IDisconnect不再执行，而现在它只是在一个覆盖集线器本身：

public class Chat : Hub 
{ 
    public override Task OnConnected() 
    { 
     return base.OnConnected(); 
    } 

    public override Task OnDisconnected() 
    { 
     return base.OnDisconnected(); 
    } 

    public override Task OnReconnected() 
    { 
     return base.OnReconnected(); 
    } 
}