在上一章節《WCF可序列化方式》 提到了NetDataContractSerializer 適用于客戶端與服務端共享類型信息，支持支持類型不變性。 但并沒有提供現成的特性，所以無法使用對數據契約進行標記的方式來達到使用NetDataContractSerializer的目的，必須通過自定制開發，才能對操作契約進行標注。

1. NetDataContractFormatAttribute特性；

public class NetDataContractFormatAttribute : Attribute, IOperationBehavior{public void AddBindingParameters(OperationDescription operationDescription, BindingParameterCollection bindingParameters){}public void ApplyClientBehavior(OperationDescription operationDescription, ClientOperation clientOperation){ReplaceDataContractSerializerOperationBehavior(operationDescription);}public void ApplyDispatchBehavior(OperationDescription operationDescription, DispatchOperation dispatchOperation){ReplaceDataContractSerializerOperationBehavior(operationDescription);}public void Validate(OperationDescription operationDescription){}public static void ReplaceDataContractSerializerOperationBehavior(OperationDescription description){DataContractSerializerOperationBehavior dcs = description.Behaviors.Find<DataContractSerializerOperationBehavior>();if (dcs != null){description.Behaviors.Remove(dcs);}description.Behaviors.Add(new NetDataContractSerializerOperationBehavior(description));}}

2. NetDataContractSerializerOperationBehavior 行為；

public class NetDataContractSerializerOperationBehavior : DataContractSerializerOperationBehavior{private static NetDataContractSerializer serializer = new NetDataContractSerializer();public NetDataContractSerializerOperationBehavior(OperationDescription operationDescription): base(operationDescription){}public override XmlObjectSerializer CreateSerializer(Type type, string name, string ns, IList<Type> knownTypes){return NetDataContractSerializerOperationBehavior.serializer;}public override XmlObjectSerializer CreateSerializer(Type type, XmlDictionaryString name, XmlDictionaryString ns, IList<Type> knownTypes){return NetDataContractSerializerOperationBehavior.serializer;}}

3. 將特性標記在契約中；

[ServiceContract(CallbackContract = typeof(IStockServiceCallback))]public interface IStockService{ [OperationContract]double GetPrice(string ticker);[OperationContract(IsOneWay = true)]void RegisterForUpdate(string ticker);[OperationContract][NetDataContractFormat]StockPrice GetStockPrice(string ticker);}

轉載于:https://www.cnblogs.com/jerryshi/archive/2011/10/23/2221679.html

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