wcf 双工

服务器

[ServiceContract(Namespace="http://www.artech.com/", CallbackContract = typeof(ICallback))]

服务接口加入CallbackContract

//添加回调接口，用户客户端回调的实现，客户端代理会自动生成这个接口。

public interface ICallback
{
[OperationContract(IsOneWay=true)]
void DisplayResult(double x, double y, double result);
}

[OperationContract(IsOneWay=true)]
void AddTest(double x, double y);

public void AddTest(double x, double y)
{

double result = x + y;

//回调客户端接口的实现方法。
ICallback callback = OperationContext.Current.GetCallbackChannel<ICallback>();
callback.DisplayResult(x, y, result);

}

客户端

实现接口

class CalculateCallback : IBLLServiceCallback
{

public void DisplayResult(double x, double y, double result)
{
Console.WriteLine("x + y = {2} when x = {0} and y = {1}", x, y, result);
}
}

调用

  InstanceContext instanceContext = new InstanceContext(new CalculateCallback());

demoClient.AddTest(1,2);

wcf 双工

原文：http://www.cnblogs.com/wolf12/p/4609918.html