Hi all i have a problem while adding a custom behavior to a WorkflowServiceHost.
Here is my WorflowServiceHostFactory:
public class ScoringWorkflowServiceHostFactory : WorkflowServiceHostFactory, IServiceHost<IKernel> { private static IKernel _InjectionInstance; public IKernel InjectionInstance { get { return _InjectionInstance ?? (_InjectionInstance = new StandardKernel(new ScoringWorkflowServicesNinjectModule(Scope))); } } public object Scope { get { return Guid.NewGuid(); } } public override ServiceHostBase CreateServiceHost(string constructorString, Uri[] baseAddresses) { String fullFilePath = Path.Combine(HostingEnvironment.ApplicationPhysicalPath, constructorString); WorkflowService wf = CSharpExpressionCompiler.Compile(fullFilePath); System.ServiceModel.Activities.WorkflowServiceHost host = base.CreateWorkflowServiceHost(wf, baseAddresses); NinjectBehaviorAttributeWF behavior = new NinjectBehaviorAttributeWF(wf); host.Description.Behaviors.Add(behavior); host.AddNinjectResolverExtension(InjectionInstance, Scope); TypeAdapterFactory.SetCurrent(new SvcMapperAdapterFactory()); LoggerFactory.SetCurrent(new EntLibLoggerFactory()); return host; } } Here is my behavior:
public class NinjectBehaviorAttributeWF : Attribute, IServiceBehavior { private System.ServiceModel.Activities.WorkflowService host; public NinjectBehaviorAttributeWF(System.ServiceModel.Activities.WorkflowService host) { this.host = host; } public void AddBindingParameters(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase, Collection<ServiceEndpoint> endpoints, BindingParameterCollection bindingParameters) { } public void ApplyDispatchBehavior(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase) { foreach (ChannelDispatcher dispatcher in serviceHostBase.ChannelDispatchers) { foreach (EndpointDispatcher endpointDispatcher in dispatcher.Endpoints) { DispatchRuntime dispatchRuntime = endpointDispatcher.DispatchRuntime; dispatchRuntime.InstanceContextProvider = new PerCallInstanceContextProvider(dispatchRuntime); } } } public void Validate(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase) { } } In this way, i have an error while loading my service(xamlx): The service type provided could not be loaded as a service because it does not have a default (parameter-less) constructor. To fix the problem, add a default constructor to the type, or pass an instance of the type to the host.
I don't know neither it's possible, nor how can create the default constructor for a workflowservice, (because the real implementation is the xamlx and not a simple class)
So, I've tried with a custom Provider:
dispatchRuntime.InstanceProvider = new CustomInstanceProvider(host.Body); where CustomInstanceProvider is:
public class CustomInstanceProvider : IInstanceProvider { string message; private System.Activities.Activity activity; public CustomInstanceProvider(string msg) { Console.WriteLine("The non-default constructor has been called."); this.message = msg; } public CustomInstanceProvider(System.Activities.Activity activity) { this.activity = activity; } public object GetInstance(InstanceContext instanceContext, System.ServiceModel.Channels.Message message) { Console.WriteLine("GetInstance is called:"); return this.activity; } public object GetInstance(InstanceContext instanceContext) { Console.WriteLine("GetInstance is called:"); return this.activity; } public void ReleaseInstance(InstanceContext instanceContext, object instance) { Console.WriteLine("ReleaseInstance is called"); } } But i have this error:
System.InvalidCastException: Unable to cast object of type 'System.ServiceModel.Activities.WorkflowService' to type 'IHttpGetMetadata'. How can I resolve my problem? Thanks a lot