WCF: Proxy open and close - whaaa?

Question

I am maintaing a Windows Forms application using WCF and are using Net.TCP internally. The lifecycle of our connections is GET/USE/CLOSE.

We are having a problem with the application pool crashing with no trace. In looking at netstat, I can see when I come into the application as we have a login service. However, even though we are creating the proxy in a using statement, the connection in netstat does not go away until I physically close the application.

Is this right? Should I be doing something different on the client to force the connection to close?

So if the connection stays open, does it stay open for the duration of the openTimeout setting and then gets torn down?

Answer 1

First, you should probably not being using your proxy within the context of a using statement even though is does implement IDisposable: http://stevesmithblog.com/blog/idisposable-and-wcf/

That being said, it all depends on how you are utilizing the proxy. Take a look at marc's response here: http://stackoverflow.com/questions/1920583/c-wcf-when-to-reuse-a-client-side-proxy

Answer 2

Yes, that's the expected behavior: the Net.TCP binding has a protocol-level transport session with your server, something you cannot really control in WCF.

I don't know of any mechanism in WCF to physically tear down that transport-level session - you might be able to do that using low-level TCP calls, but I've never had the need to do anything like that.