WCF PollingDuplexHttpBinding with Silverlight Client Timeouts and Errors

Question

I am building a WPF 3.5 desktop application that has a self-service WCF service.

The service has a PollingDuplexHttpBinding endpoint defined as follows:

public static void StartService()
    {
        var selfHost = new ServiceHost(Singleton, new Uri("http://localhost:1155/"));

        selfHost.AddServiceEndpoint(
            typeof(IMyService), 
            new PollingDuplexHttpBinding(PollingDuplexMode.MultipleMessagesPerPoll) {ReceiveTimeout = new TimeSpan(1,0,0,0)},
            "MyService"
        );

        ServiceMetadataBehavior smb = new ServiceMetadataBehavior();
        smb.HttpGetEnabled = true;
        selfHost.Description.Behaviors.Add(smb);

        selfHost.AddServiceEndpoint(typeof(IPolicyRetriever), new WebHttpBinding(), "").Behaviors.Add(new WebHttpBehavior());

        selfHost.Open();
    }

Note. IPolicyRetriever is a service that allows me to define a policy file

This works, and I can see my service in the Silverlight client application. Then I create a proxy server link in Silverlight code as follows:

        EndpointAddress address = new EndpointAddress("http://localhost:1155/MyService");

        PollingDuplexHttpBinding binding = new PollingDuplexHttpBinding(PollingDuplexMode.MultipleMessagesPerPoll);
        binding.ReceiveTimeout = new TimeSpan(1, 0, 0, 0);
        _proxy = new MyServiceClient(binding, address);
        _proxy.ReceiveReceived += MessageFromServer;
        _proxy.OrderAsync("Test", 4);

And it also works great, communication works!

But if I leave it alone (i.e. did not send messages from the server) for more than 1 minute, try sending a message to the client from the WPF server application, I get errors like this:

IOutputChannel 00:01:00. -, SendTimeout Binding. , , , -.

localhost, , 1- . , , - .

, ,

, System.ServiceModel.Channels.ServiceChannel, ,

, ?

Answer 1

WPF wsDualHttpBinding, Silverlight - . WPF ; Silverlight ServiceHostFactory . , Silverlight , .

PollingDuplexHttpBinding CustomBinding MultipleMessagesPerPoll.

web.config

<system.serviceModel>
    <behaviors>
        <serviceBehaviors>
            <behavior name="SlApp.Web.DuplexServiceBehavior">
                <serviceMetadata httpGetEnabled="true" />
                <serviceDebug includeExceptionDetailInFaults="true" />
            </behavior>
        </serviceBehaviors>
    </behaviors>

  <serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" />

    <services>
        <service behaviorConfiguration="SlApp.Web.DuplexServiceBehavior" name="SlApp.Web.DuplexService">
            <endpoint address="WS" binding="wsDualHttpBinding" contract="SlApp.Web.DuplexService" />
            <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
        </service>
    </services>      
</system.serviceModel>

DuplexService.svc:

<%@ ServiceHost Language="C#" Debug="true" Service="SlApp.Web.DuplexService" Factory="SlApp.Web.DuplexServiceHostFactory" %>

DuplexServiceHostFactory.cs:

    public class DuplexServiceHostFactory : ServiceHostFactoryBase
    {
        public override ServiceHostBase CreateServiceHost(string constructorString, Uri[] baseAddresses)
        {
            return new DuplexServiceHost(baseAddresses);
        }
    }

    class DuplexServiceHost : ServiceHost
    {
        public DuplexServiceHost(params Uri[] addresses)
        {
            base.InitializeDescription(typeof(DuplexService), new UriSchemeKeyedCollection(addresses));
        }

        protected override void InitializeRuntime()
        {
            PollingDuplexBindingElement pdbe = new PollingDuplexBindingElement()
            {
                ServerPollTimeout = TimeSpan.FromSeconds(3),
                //Duration to wait before the channel is closed due to inactivity
                InactivityTimeout = TimeSpan.FromHours(24)
            };

            this.AddServiceEndpoint(typeof(DuplexService),
                new CustomBinding(
                    pdbe,
                    new BinaryMessageEncodingBindingElement(),
                    new HttpTransportBindingElement()), string.Empty);

            base.InitializeRuntime();
        }
    }

Silverlight:

address = new EndpointAddress("http://localhost:43000/DuplexService.svc");
binding = new CustomBinding(
            new PollingDuplexBindingElement(),
            new BinaryMessageEncodingBindingElement(),
            new HttpTransportBindingElement()
        );
proxy = new DuplexServiceClient(binding, address);