在控制台宿主程序中，为什么不能同时实例化两个ServiceHost？

Question

代码如下： using (ServiceHost                 DuplexCommonHost = new ServiceHost(typeof(DuplexCommonService)),                 OneWayCommonHost = new ServiceHost(typeof(OneWayCommonService)))            {                DuplexCommonHost.Opened += delegate { Console.Write("DuplexCommon service has been opened!"); };                DuplexCommonHost.Open();                OneWayCommonHost.Opened += delegate { Console.Write("OneWayCommon service has been opened!"); };                OneWayCommonHost.Open();                Console.Read();               }结果客户端报一下错误：没有终结点在侦听可以接受消息的 http://localhost:8080/OneWayCommon屏蔽红色部分代码，客户端正常运行。