[ServiceContract]public interface ISome{[OperationContract]Guid GetUID();}class SomeService : ISome{public Guid GetUID(){Guid id = Guid.NewGuid();Console.WriteLine($"第二个服务被调用，产生的ID为：{id}");return id;}}

    [ServiceContract]public interface ITestService{[OperationContract]void TestCall();}

    internal class TestService : ITestService{public void TestCall(){Console.WriteLine("即将调用另一个服务。");// 调用其他服务ISome cnl = ChannelFactory<ISome>.CreateChannel(new BasicHttpBinding(), new EndpointAddress("http://localhost:12345"));// 调用完成后，再次回来Guid id = cnl.GetUID();((IClientChannel)cnl).Close();Console.WriteLine($"回到当前服务。得到的ID为：{id}");}}

    [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall, ConcurrencyMode = ConcurrencyMode.Reentrant)]internal class TestService : ITestService{……}

            using (ServiceHost host = new ServiceHost(typeof(TestService))){host.AddServiceEndpoint(typeof(ITestService), new WSHttpBinding(), "http://localhost:9000");host.Open(); //运行服务Console.WriteLine("主服务已启动。");……Console.ReadKey();}

                Action actdlg = () =>{ITestService cn = ChannelFactory<ITestService>.CreateChannel(new WSHttpBinding(), new EndpointAddress("http://localhost:9000"));cn.TestCall();// 关闭通道
                      ((IClientChannel)cn).Close();};// 开启5个任务Task[] tasks = new Task[5];// 初始化每个任务for (int n = 0; n < tasks.Length; n++){tasks[n] = new Task(actdlg);}// 开始执行任务foreach (Task t in tasks){t.Start();}// 等待所有任务完成Task.WaitAll(tasks);