Question

两种方法MyBehavior :: CreateSerializer（）都没有被调用，但是ReplaceBehavior（）方法正在运行。它正在使用我的自定义更改默认行为。

有人知道问题出在哪里吗？

重点是编写自定义REST WCF序列化程序，该序列化程序应生成非XML文本格式结果。

  public class MySerializerFormatAttribute : Attribute, IOperationBehavior
   {
      public void AddBindingParameters(OperationDescription description, BindingParameterCollection parameters)
      {
      }

      public void Validate(OperationDescription description)
      {
      }

      private static void ReplaceBehavior(OperationDescription description)
      {
         DataContractSerializerOperationBehavior dcsOperationBehavior = description.Behaviors.Find<DataContractSerializerOperationBehavior>();
         if (dcsOperationBehavior != null)
         {
            int idx = description.Behaviors.IndexOf(dcsOperationBehavior);
            description.Behaviors.Remove(dcsOperationBehavior);
            description.Behaviors.Insert(idx, new MyBehavior(description));
         }
      }

      public void ApplyClientBehavior(OperationDescription description, ClientOperation proxy)
      {
         ReplaceBehavior(description);
      }


      public void ApplyDispatchBehavior(OperationDescription description, DispatchOperation dispatch)
      {
         ReplaceBehavior(description);
      }
   };

   public class MySerializer : XmlObjectSerializer
   {
      public override bool IsStartObject(XmlDictionaryReader reader)
      {
         throw new NotImplementedException();
      }

      public override object ReadObject(XmlDictionaryReader reader, bool verifyObjectName)
      {
         throw new NotImplementedException();
      }

      public override void WriteEndObject(XmlDictionaryWriter writer)
      {
         throw new NotImplementedException();
      }

      public override void WriteObjectContent(XmlDictionaryWriter writer, object graph)
      {
         throw new NotImplementedException();
      }

      public override void WriteStartObject(XmlDictionaryWriter writer, object graph)
      {
         throw new NotImplementedException();
      }
   }

   // Custom Web service behaviour that passes custom serializer
   public class MyBehavior : DataContractSerializerOperationBehavior
   {
      private static MySerializer serializer = new MySerializer();

      public MyBehavior(OperationDescription operationDescription) : base(operationDescription) 
      { 
      }

      public override XmlObjectSerializer CreateSerializer(Type type, string name, string ns, IList<Type> knownTypes)
      {
         return MyBehavior.serializer;
      }

      public override XmlObjectSerializer CreateSerializer(Type type, XmlDictionaryString name, XmlDictionaryString ns, IList<Type> knownTypes)
      {
         return MyBehavior.serializer;
      }
   }

Answer 1

在System.ServiceModel.Web世界中完全忽略了这一点。在Reflector中检出DataContractSerializerOperationBehavior。您将看到“System.ServiceModel.Dispatcher.DataContractJsonSerializerOperationBehavior”。如果你对它运行Analyze（Used By），你会看到恐怖：DataContractJsonSerializerOperationFormatter实例化DataContractJsonSerializerOperationBehavior本身。所以...你添加的任何东西都不会做任何事情。

真正糟糕的是操作格式化程序及其周围的所有内容都是内部的。 WCF是非常可扩展的，但构建System.ServiceModel.Web的人似乎讨厌可扩展性。我每周至少遇到一次密封/内部路障。几乎所有的SOAP自定义都不适用于JSON世界。

可能是我的自定义REST序列化程序无法正常工作的原因？

1 个答案: