我的宿舍代码
 ServiceHost host = new ServiceHost(typeof(CalculatorService));
            host.AddServiceEndpoint(typeof(ICalculator), new WSHttpBinding(), "http://127.0.0.1:9999/calculatorservice");
            if (host.Description.Behaviors.Find<ServiceMetadataBehavior>() == null)
            {
                ServiceMetadataBehavior behavior = new ServiceMetadataBehavior();
                behavior.HttpGetEnabled = true;
                behavior.HttpGetUrl = new Uri("http://127.0.0.1:9999/calculatorservice/metadata");
                host.Description.Behaviors.Add(behavior);
            }
            host.Opened += delegate
            {
                Console.WriteLine("CalculaorService已经启动,按任意键终止服务!");
            };
            host.Open();
            Console.Read();我的服务契约是:ICalculator,服务时:CalculatorService。如果我有多个服务契约(例如:IService1、IService2、IService3.。)如何来启动呢?