在WCF操作中修改返回值

Question

我想確保在我們的WCF中返回數據集的所有操作都具有在Property SchemaSerializationMode中設置的.ExcludedSchema值。

我可以使用CustomBehavior執行此操作嗎？ 我試圖實現一個CustomDispatchBehavior並添加一個MessageInspector，但AfterReceiveRequest和BeforeSendReply方法不會讓我對返回值做任何事情。在BeforeSendreply中，返回值已經被序列化。我可以在哪裏插入我的代碼？

public class CustomDispatchBehavior : BehaviorExtensionElement, IServiceBehavior 
    { 

     public override Type BehaviorType 
     { 
      get { return typeof(CustomDispatchBehavior); } 
     } 

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

     void IServiceBehavior.AddBindingParameters(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase, System.Collections.ObjectModel.Collection<ServiceEndpoint> endpoints, BindingParameterCollection bindingParameters) 
     { 
      //throw new NotImplementedException(); 
     } 

     void IServiceBehavior.ApplyDispatchBehavior(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase) 
     { 
      //throw new NotImplementedException(); 
      foreach (ChannelDispatcher chanDisp in serviceHostBase.ChannelDispatchers) 
      { 
       foreach (EndpointDispatcher ed in chanDisp.Endpoints) 
       { 
        ed.DispatchRuntime.MessageInspectors.Add(new MyMessageInspector()); 

       } 
      } 
     } 

     void IServiceBehavior.Validate(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase) 
     { 
      //throw new NotImplementedException(); 
     } 

    } 

Answer 1

我解決它使用IParametorInspector

void IServiceBehavior.ApplyDispatchBehavior(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase) 
    {  

     foreach (ChannelDispatcher chDisp in serviceHostBase.ChannelDispatchers) 
     { 
      foreach (EndpointDispatcher epDisp in chDisp.Endpoints) 
      {     
       foreach (DispatchOperation op in epDisp.DispatchRuntime.Operations) 
        op.ParameterInspectors.Add(new DataSetParameterInspector()); 
      } 
     } 

    } 

巡查員看起來像這樣

public class DataSetParameterInspector : IParameterInspector 
{ 

    public void AfterCall(string operationName, object[] outputs, object returnValue, object correlationState) 
    { 
     Type t =returnValue.GetType(); 
     if (t.IsSubclassOf(typeof(GlobalUtils.RR.Response))) 
     { 
      foreach (var pi in t.GetProperties()) 
      { 
       if (pi.PropertyType.IsSubclassOf(typeof(System.Data.DataSet))) 
       { 
        object parameter = pi.GetValue(returnValue, null); 
        if (parameter != null) 
         ((System.Data.DataSet)parameter).SchemaSerializationMode = System.Data.SchemaSerializationMode.ExcludeSchema; 
       } 
      } 
     } 
    } 

Answer 2

看看IDispatchMessageFormatter接口。它定義了反序列化請求消息和序列化服務應用程序中的響應消息的方法。