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; 
      } 
   }