Problems with an Closed Connection

Question

I have a WCF service that I consume by my WPF client.
The connection is mannaged by a singleton class.
 
Now I know that after 10 minutes of inactivity the connection is closed on server side. But I can not find a method on my wcfclient to check the state of the connection.
I use the following code.

private ServiceController()



        {



            this.m_ProPlanClient = new ServiceProPlanClient();



            



            this.AttachEventHandlers();



            this.InitialiseCollections();



        }











private void CheckAndReopenConnection()



        {



            



            if (this.ProPlanClient.State == CommunicationState.Closed)



            {



                this.ProPlanClient.Open();



            }



        }











 public void GetAllCustomersAsync()



        {



            this.CheckAndReopenConnection();







            this.ProPlanClient.GetAllCustomersAsync();



        }

The connectionstate is always Open, it does not matter wheter I wait 5 min or 25 min.
Are there any ideas on how the check if the connection is really still open.
because I do not want to close my connection after every singel call.

Answer 1

WCF is not psychic. The only way it will know if the connection is dead is if it tries to talk to the service. Therefore, if you want to know if the service is dead have a "ping" operation on the contract and call that to see if you get a failure

---

Richard Blewett, thinktecture - http://www.dotnetconsult.co.uk/weblog2
Twitter: richardblewett

Answer 2

I think I am still doing something wrong
I made the following

[OperationContract(IsOneWay = true, IsInitiating = false, IsTerminating = false)]
        void Ping();


        public void Ping()
        {
        }

and client code

private void CheckAndReopenConnection()
        {
            try
            {
                this.ProPlanClient.Ping();
            }
            catch
            {
                if (this.ProPlanClient.State != CommunicationState.Opened && this.ProPlanClient.State != CommunicationState.Opening)
                {
                    this.ProPlanClient.Open();
                }
            }
        }

I can not call Open because I still get an error.
Am I missing something or going the wrong way.

Answer 3

Is the error you refer to a new error?

You need to recreate the proxy.

private void CheckAndReopenConnection()
        {
            try
            {
                this.ProPlanClient.Ping();
            }
            catch
            {
                ((IChannel)this.ProPlanClient).Abort();
                this.ProPlanClient = null;
            }

            if (this.ProPlanClient == null)
            {
                this.ProPlanClient = // recreate channel
                this.ProPlanClient.Open();
            }
        }

Answer 4

This solved my problem. I just needed a few lines more.