C# 无法侦听管道名称，因为另一个管道端点已在侦听该名称

我得到以下错误：

无法在管道名称“net”上侦听。pipe://localhost/ServiceModelSamples/service/'因为另一个管道端点已在侦听该名称

我正在从另一个WCF调用调用windows服务内部的WCF自托管服务，如下所示

$

App.Config

$

/配置>

听起来好像有两个侦听器在争夺同一端口。请确保尚未运行实例，然后重试。这是否有帮助？好的，我已经更改了一些代码，现在我在尝试访问proxy.SendPin（pin）时遇到另一个错误。“读取管道时出错：管道已结束。”请参阅原始帖子

ServiceHost _host;
var guidid = Guid.NewGuid().ToString() ;

_host = new ServiceHost(typeof(CalculatorService), new Uri[] { new Uri("net.pipe://localhost/" + guidid)});

_host.AddServiceEndpoint(typeof(ICalculator),
        new NetNamedPipeBinding(),
        "");

_host.Open();

ChannelFactory<ICalculator> factory = new ChannelFactory<ICalculator>(
    new NetNamedPipeBinding(NetNamedPipeSecurityMode.None),
    new EndpointAddress("net.pipe://localhost/" + guidid));
ICalculator proxy = factory.CreateChannel();
proxy.SendPin(pin);
((IClientChannel)proxy).Close();
factory.Close();

namespace PINSender
{
    // Define a service contract.    
    
    public interface ICalculator
    {
        [OperationContract]
        void SendPin(string pin);
    }

    // Implement the ICalculator service contract in a service class.
    public class CalculatorService : ICalculator
    {
        // Implement the ICalculator methods.
        public void  SendPin(string pin)
        {
            
        }
    }

    public class CalculatorWindowsService : ServiceBase
    {
        public ServiceHost serviceHost = null;
        public CalculatorWindowsService()
        {
            // Name the Windows Service
            ServiceName = "PINSenderService";
        }

        public static void Main()
        {
            ServiceBase.Run(new CalculatorWindowsService());
        }

        // Start the Windows service.
        protected override void OnStart(string[] args)
        {
            if (serviceHost != null)
            {
                serviceHost.Close();
            }

            // Create a ServiceHost for the CalculatorService type and 
            // provide the base address.
            serviceHost = new ServiceHost(typeof(CalculatorService));

            // Open the ServiceHostBase to create listeners and start 
            // listening for messages.
            serviceHost.Open();
        }

        protected override void OnStop()
        {
            if (serviceHost != null)
            {
                serviceHost.Close();
                serviceHost = null;
            }
        }
    }

    // Provide the ProjectInstaller class which allows 
    // the service to be installed by the Installutil.exe tool
    [RunInstaller(true)]
    public class ProjectInstaller : Installer
    {
        private ServiceProcessInstaller process;
        private ServiceInstaller service;

        public ProjectInstaller()
        {
            process = new ServiceProcessInstaller();
            process.Account = ServiceAccount.LocalSystem;
            service = new ServiceInstaller();
            service.ServiceName = "PINSenderService";
            Installers.Add(process);
            Installers.Add(service);
        }
    }
}