public ServiceDescription BuildServiceDescription(out IDictionary <string, ContractDescription> implementedContracts, out IList <Type> reflectedContracts) { ServiceDescriptionContext context = new ServiceDescriptionContext(); ServiceDescription description = new ServiceDescription(); ApplyBehaviors(description); context.ServiceDescription = description; Walker walker = new Walker(true); walker.FoundActivity += delegate(Walker w, WalkerEventArgs args) { IServiceDescriptionBuilder activity = args.CurrentActivity as IServiceDescriptionBuilder; if (activity == null) { return; } activity.BuildServiceDescription(context); }; walker.Walk(this.workflowDefinitionContext.GetWorkflowDefinition()); if (context.Contracts == null || context.Contracts.Count == 0) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR2.GetString(SR2.NoContract))); } implementedContracts = context.Contracts; reflectedContracts = context.ReflectedContracts; return(description); }