如何在WCF服务上检测到客户端刚刚断开连接？

Question

I'm handling the channel faulting and closing event as below

 [ServiceBehavior(InstanceContextMode = InstanceContextMode.Single,
                    ConcurrencyMode = ConcurrencyMode.Multiple,
                    UseSynchronizationContext = false)]

 OperationContext.Current.Channel.Faulted += Channel_Faulted;
 OperationContext.Current.Channel.Closed += Channel_Closed;

 private void Channel_Faulted(object sender, EventArgs e)
 {
       //perform Something
 }

 private void Channel_Closed(object sender, EventArgs e)
 {
        //perform Something
 }

The binding info is as below.

NetTcpBinding tcpBinding = new NetTcpBinding(SecurityMode.None, true);
tcpBinding.ReceiveTimeout = new TimeSpan(48, 0, 0);
tcpBinding.ReliableSession.Enabled = true;
tcpBinding.ReliableSession.InactivityTimeout = new TimeSpan(0, 0, 10);

The event handlers get hit when i gracefully end the client by closing/aborting the proxy but the event handlers do not get called when i kill the client process through the Task Manager or shutdown the system on which the client is running. What am i doing wrong here? Any code example to handle this situation will be helpful, thanks.

Answer 1

Is this an XY problem? If your service instancing is PerCall it won't matter because connections will open and close for each method call to the service.

Service faulting only occurs as a result of using a WCF conduit. Killing the process will sever the underlying TCP connection. Unless your server is in the middle of using the channel it won't fault.

What I generally like to do with my per-session WCF services is mark them IDisposable then handle any cleanup tasks in the Dispose regardless of graceful termination.