Unity.WCF Asking for default constructor

Question

Implementing Unity.WCF as seen here: https://unitywcf.codeplex.com/

When I host the service whilst using fileless activation it is still asking me for a default constructor, rather than resolve the Service via unity, I'm unsure what I have missed.

WCFServiceFactory:

public class WcfServiceFactory : UnityServiceHostFactory
{
protected override void ConfigureContainer(IUnityContainer container)
{
        container.RegisterType<IPollerSVC, ProductionHostSVC>()
                 .RegisterType<PeriodicTaskFactory>()
                 .RegisterType<CancellationTokenSource>(new HierarchicalLifetimeManager())
                 .RegisterType<IProcessor, ThirdPartyProcessor>();      
}
}

Web.config:

<?xml version="1.0"?>
<configuration>
  <appSettings/>
  <system.web>
    <compilation debug="true" targetFramework="4.0"/>
    <httpRuntime/>
  </system.web>
  <system.serviceModel>
    <behaviors>
      <serviceBehaviors>
        <behavior>
          <!-- To avoid disclosing metadata information, set the values below to false before deployment -->
          <serviceMetadata httpGetEnabled="true" httpsGetEnabled="true"/>
          <!-- To receive exception details in faults for debugging purposes, set the value below to true.  Set to false before deployment to avoid disclosing exception information -->
          <serviceDebug includeExceptionDetailInFaults="false"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <protocolMapping>
      <add binding="basicHttpsBinding" scheme="https"/>
    </protocolMapping>
    <serviceHostingEnvironment>
      <serviceActivations>
        <add factory="IISHostThirdParty.WcfServiceFactory" relativeAddress="./ProductionHost.svc" service="Service.Common.ProductionHostSVC"/>
      </serviceActivations>
    </serviceHostingEnvironment>
  </system.serviceModel>
  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true"/>
    <!--
        To browse web app root directory during debugging, set the value below to true.
        Set to false before deployment to avoid disclosing web app folder information.
  -->
    <directoryBrowse enabled="true"/>
  </system.webServer>
</configuration>

Service:

    [ServiceContract(Namespace = "http://Services/IPollerService")]
    public interface IPollerSVC
    {
        Task PollingTask { get; }

    }

[ServiceBehavior(Name = "Services.SL.ThirdParty.ServiceHost", InstanceContextMode = InstanceContextMode.Single, ConcurrencyMode = ConcurrencyMode.Single, UseSynchronizationContext = true)]

public class ProductionHostSVC : IPollerSVC
{
    public ProductionHostSVC(IProcessor processor,
                             PeriodicTaskFactory taskFactory,
                             CancellationTokenSource ctks)
    {
        _ctks = ctks;

    }

    public Task PollingTask { get; }
}

This is a stretch, but you are registering the service with the container before some of its dependencies. Have you tried changing the registration order around so .RegisterType<IPollerSVC, ProductionHostSVC>() is last in ConfigureContainer. — R. Richards
– R. Richards, Commented Jun 17, 2016 at 17:28
I've just had a look and this doesn't work, nice idea though. — edwin the duck
– edwin the duck, Commented Jun 20, 2016 at 11:37

Mikhail Tumashenko · Accepted Answer · 2019-01-10 08:53:54Z

0

Pretty old but still useful answer is here.

In short: WCF does not call InstanceProvider if InstanceContextMode.Single is used. So Unity.WCF can't be used to instantiate a service.

answered Jan 10, 2019 at 8:53

Mikhail Tumashenko

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