为什么Console.Read()能造成这种现象？

Question

遇到了这样一个问题，谁能解释一下是什么回事？ WCF宿主程序是一个控制台程序，代码如下         static void Main(string[] args)        {            //HostingServiceViaCode();            using (ServiceHost calculatorServiceHost = new ServiceHost(typeof(CalculatorService)))            {                calculatorServiceHost.Opened += delegate { Console.WriteLine("Calculator Service begin to listen via the Address:{0}", calculatorServiceHost.BaseAddresses[0].ToString()); };                calculatorServiceHost.Open();                Console.Read();            }                } 运行宿主程序，开启服务。运行客户端程序，正常。 可当我把Console.Read();移到Using语句的外面，如下：         static void Main(string[] args)        {            //HostingServiceViaCode();            using (ServiceHost calculatorServiceHost = new ServiceHost(typeof(CalculatorService)))            {                calculatorServiceHost.Opened += delegate { Console.WriteLine("Calculator Service begin to listen via the Address:{0}", calculatorServiceHost.BaseAddresses[0].ToString()); };                calculatorServiceHost.Open();                            }            Console.Read();        } 再运行客户端程序，结果报一下错误： Message:无法连接到 http://localhost:8889/GeneralCalculator。TCP 错误代码 10061:由于目标计算机积极拒绝，无法连接。 127.0.0.1:8889。