WCF双工通信

1、服务

      服务必须定义回调函数的接口

[ServiceContract(SessionMode = SessionMode.Required, CallbackContract=typeof(IServiceDuplexCallback))]
 public interface IServiceClass
 {
 [OperationContract(IsOneWay=true)]
 void AddNumber(int number);


 [OperationContract(IsOneWay=true)]
 void SubtractNumber(int number);
 }


 public interface IServiceDuplexCallback
 {
 [OperationContract(IsOneWay = true)]
 void Calculate(int result);
 }IServiceDuplexCallback callback
 {
 get { return OperationContext.Current.GetCallbackChannel<IServiceDuplexCallback>(); }
 }

2、绑定

    绑定方式需要选择：wsDualHttpBinding，双工通信

   <endpoint address="" binding="wsDualHttpBinding" contract="WCFService.IServiceClass"/>

3、客户端调用

     客户端实现接口

public class CallbackHandler : TCP.IServiceClassCallback
     {
         public void Calculate(int result)
         {
             MessageBox.Show(result.ToString());
         }
     }

     将实现接口实例作为参数传到服务

InstanceContext ic = new InstanceContext(new CallbackHandler());
                     TCP.ServiceClassClient client = new WCFClientApp.TCP.ServiceClassClient(ic);
                     client.AddNumber(val1);
                     client.AddNumber(val2);
                     //client.Close();