Adding a custom wcf behavior extension causes a ConfigurationErrorsException

Question

I want to add a behavior extension so that my service classes will be instantiated with Ninject. I created a class that inherits from BehaviorExtensionElement and registered it in my App.config. I cannot see anything obvious I'm missing, yet on startup this is thrown:

System.Configuration.ConfigurationErrorsException: An error occurred creating the configuration section handler for system.serviceModel/behaviors: Extension element TestExtension cannot be added to this element. Verify that the extension is registered in the extension collection at system.serviceModel/extensions/behaviorExtensions.
Parameter name: element (...\MyAssembly.dll.config line 42) ---> 
System.ArgumentException: Extension element TestExtension cannot be added to this element. 
Verify that the extension is registered in the extension collection at system.serviceModel/extensions/behaviorExtensions.
Parameter name: element

Here is my App.config:

<system.serviceModel>
<extensions>
  <behaviorExtensions>
    <add name="TestExtension" type="Mynamespace.DependencyInjectionServiceBehavior,MyAssembly,Version=1.0.0.0,Culture=neutral,PublicKeyToken=null" />
  </behaviorExtensions>
</extensions>
<behaviors>
  <serviceBehaviors>
    <behavior name="MyServiceBehavior">
      <TestExtension/>
    </behavior>
  </serviceBehaviors>
</behaviors>

Here is my behaviour class:

public class DependencyInjectionServiceBehavior : BehaviorExtensionElement, IServiceBehavior
{
    public void ApplyDispatchBehavior(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)
    {
        foreach (ChannelDispatcherBase cdb in serviceHostBase.ChannelDispatchers)
        {
            ChannelDispatcher cd = cdb as ChannelDispatcher;
            if (cd != null)
            {
                foreach (EndpointDispatcher ed in cd.Endpoints)
                {
                    ed.DispatchRuntime.InstanceProvider =
                        new DependencyInjectionInstanceProvider(serviceDescription.ServiceType);
                }
            }
        }
    }

    public void Validate(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)
    {
    }

    public void AddBindingParameters(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase,
        Collection<ServiceEndpoint> endpoints, BindingParameterCollection bindingParameters)
    {
    }

    public override Type BehaviorType
    {
        get { return this.GetType(); }
    }

    protected override object CreateBehavior()
    {
        return new DependencyInjectionServiceBehavior();
    }

}

Answer 1

Turns out the type name needs to be exactly equivalent to typeof(DependencyInjectionServiceBehavior).AssemblyQualifiedName. My earlier understanding was that there wasn't supposed to be any spaces in the fully qualified type name, which turned out to be wrong.