如何在1个Windows服务中托管2个WCF服务？

我有一个WCF应用程序,它有两个服务,我试图使用net.tcp在一个 Windows服务中托管.我可以运行任何一种服务,但只要我尝试将它们都放在Windows服务中,只有第一个服务加载.我已经确定第二个服务ctor正在被调用,但OnStart永远不会被激活.这告诉我WCF发现加载第二个服务有问题.

使用net.tcp我知道我需要打开端口共享并启动服务器上的端口共享服务.这一切似乎都运作正常.我已经尝试将服务放在不同的TCP端口上但仍然没有成功.

我的服务安装程序类如下所示：

[RunInstaller(true)]
 public class ProjectInstaller : Installer
 {
      private ServiceProcessInstaller _process;
      private ServiceInstaller        _serviceAdmin;
      private ServiceInstaller        _servicePrint;

      public ProjectInstaller()
      {
            _process = new ServiceProcessInstaller();
            _process.Account = ServiceAccount.LocalSystem;

            _servicePrint = new ServiceInstaller();
            _servicePrint.ServiceName = "PrintingService";
            _servicePrint.StartType = ServiceStartMode.Automatic;

            _serviceAdmin = new ServiceInstaller();
            _serviceAdmin.ServiceName = "PrintingAdminService";
            _serviceAdmin.StartType = ServiceStartMode.Automatic;

            Installers.AddRange(new Installer[] { _process,_servicePrint,_serviceAdmin });
      }   
}

这两项服务看起来非常相似

class PrintService : ServiceBase
 {

      public ServiceHost _host = null;

      public PrintService()
      {
            ServiceName = "PCTSPrintingService";
            CanStop = true;
            AutoLog = true;

      }

      protected override void OnStart(string[] args)
      {
            if (_host != null) _host.Close();

            _host = new ServiceHost(typeof(Printing.ServiceImplementation.PrintingService));
            _host.Faulted += host_Faulted;

            _host.open();
      }
}

internal class MyWCFService1
{
    internal static System.ServiceModel.ServiceHost serviceHost = null;

    internal static void StartService()
    {
        if (serviceHost != null)
        {
            serviceHost.Close();
        }

        // Instantiate new ServiceHost.
        serviceHost = new System.ServiceModel.ServiceHost(typeof(MyService1));
        // Open myServiceHost.
        serviceHost.open();
    }

    internal static void StopService()
    {
        if (serviceHost != null)
        {
            serviceHost.Close();
            serviceHost = null;
        }
    }
};

// Start the Windows service.
    protected override void OnStart( string[] args )
    {
        // Call all the set up WCF services...
        MyWCFService1.StartService();
        //MyWCFService2.StartService();
        //MyWCFService3.StartService();


    }