问找不到ServiceHost指令中的WCF、服务属性值

EN

    Server Error in '/WebServices' Application.
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The type 'QS.DialogManager.Communication.IISHost.RecipientService', provided as the Service attribute value in the ServiceHost directive could not be found. 
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.InvalidOperationException: The type 'QS.DialogManager.Communication.IISHost.RecipientService', provided as the Service attribute value in the ServiceHost directive could not be found.

Source Error: 

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.  

Stack Trace: 


[InvalidOperationException: The type 'QS.DialogManager.Communication.IISHost.RecipientService', provided as the Service attribute value in the ServiceHost directive could not be found.]
   System.ServiceModel.Activation.ServiceHostFactory.CreateServiceHost(String constructorString, Uri[] baseAddresses) +6714599
   System.ServiceModel.HostingManager.CreateService(String normalizedVirtualPath) +604
   System.ServiceModel.HostingManager.ActivateService(String normalizedVirtualPath) +46
   System.ServiceModel.HostingManager.EnsureServiceAvailable(String normalizedVirtualPath) +654

[ServiceActivationException: The service '/WebServices/dm/RecipientService.svc' cannot be activated due to an exception during compilation.  The exception message is: The type 'QS.DialogManager.Communication.IISHost.RecipientService', provided as the Service attribute value in the ServiceHost directive could not be found..]
   System.ServiceModel.AsyncResult.End(IAsyncResult result) +15626880
   System.ServiceModel.Activation.HostedHttpRequestAsyncResult.End(IAsyncResult result) +15546921
   System.ServiceModel.Activation.HostedHttpRequestAsyncResult.ExecuteSynchronous(HttpApplication context, Boolean flowContext) +265
   System.ServiceModel.Activation.HttpModule.ProcessRequest(Object sender, EventArgs e) +227
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +80
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +171




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Version Information: Microsoft .NET Framework Version:2.0.50727.3082; ASP.NET Version:2.0.50727.3082 

<%@ ServiceHost Language="C#" Debug="true" Service="QS.DialogManager.Communication.IISHost.RecipientService" CodeBehind="RecipientService.svc.cs" %>

The type 'IISHost.Service1', provided as the Service attribute value in the ServiceHost directive could not be found.