如何解决"ChannelDispatcher无法打开其IChannelListener"错误？

Question

我正在尝试在Windows服务中托管的WCF和我的服务GUI之间进行通信.问题是我正在尝试执行OperationContract方法

"'net.tcp:// localhost:7771/MyService'中的ChannelDispatcher与合同'"IContract"'无法打开其IChannelListener."

我的app.conf看起来像这样:

<configuration>
<system.serviceModel>
    <bindings>
        <netTcpBinding>
            <binding name="netTcpBinding">
                <security>
                    <transport protectionLevel="EncryptAndSign" />
                </security>
            </binding>
        </netTcpBinding>
    </bindings>
    <behaviors>
        <serviceBehaviors>
            <behavior name="MyServiceBehavior">
                <serviceMetadata httpGetEnabled="true" httpGetUrl="http://localhost:7772/MyService" />
                <serviceDebug includeExceptionDetailInFaults="true" />
            </behavior>
        </serviceBehaviors>
    </behaviors>
    <services>
        <service behaviorConfiguration="MyServiceBehavior"
            name="MyService.Service">
            <endpoint address="net.tcp://localhost:7771/MyService" binding="netTcpBinding"
                bindingConfiguration="netTcpBinding" name="netTcp" contract="MyService.IContract" />
        </service>
    </services>
</system.serviceModel>

端口7771正在侦听(使用netstat检查),svcutil能够为我生成配置.

任何建议,将不胜感激.

---

从异常堆栈跟踪

Server stack trace: 
   at System.ServiceModel.Channels.ServiceChannel.ThrowIfFaultUnderstood(Message reply, MessageFault fault, String action, MessageVersion version, FaultConverter faultConverter)
   at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc)
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs)
   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

---

有一个内部的exeption(但不在Exeption.InnerExeption下但在Exeption.Detail.InnerExeption下 - ToString()方法没有显示)

已经存在URI'net.tcp:// localhost:7771/MyService'的注册.

但是我的服务只在app.config文件中指定了这个URI.在整个解决方案中,此URI在服务器中一次和客户端一次.

Answer 1

对于这种类型的异常,内部异常具有对诊断问题有用的信息.这是一个相当普遍的错误,可能由一堆不同的东西引起.

Answer 2

我解决了它:D

以下是问题的解释:

第一个BAD代码:

namespace WCFServer
{
    public class Program : IWCFService
    {
        private ServiceHost host;

        static void Main(string[] args)
        {
            new Program();
        }

        public Program()
        {
            host = new ServiceHost(typeof(Program));

            host.Open();

            Console.WriteLine("Server Started!");

            Console.ReadKey();
        }

        #region IWCFService Members

        public int CheckHealth(int id)
        {
            return (1);
        }

        #endregion
    }
}

如您所见,服务合同是在托管服务的类中实现的.这导致整个错误的事情(也许typeof()运行一个构造函数,我不知道我对这个问题有建设性的意见).

好的代码:

namespace WCFServer
{
    public class Program
    {
        private ServiceHost host;

        static void Main(string[] args)
        {
            new Program();
        }

        public Program()
        {
            host = new ServiceHost(typeof(WCF));

            host.Open();

            Console.WriteLine("Server Started!");

            Console.ReadKey();
        }
    }

    public class WCF : IWCFService
    {

        #region IWCFService Members

        public int CheckHealth(int id)
        {
            return (1);
        }

        #endregion
    }
}

两个文件的服务合同:

[ServiceContract]
public interface IWCFService
{
    [OperationContract]
    int CheckHealth(int id);
}

App.config中

<configuration>
<system.serviceModel>
    <behaviors>
        <serviceBehaviors>
            <behavior name="WCFBehavior" />
        </serviceBehaviors>
    </behaviors>
    <bindings>
        <netTcpBinding>
            <binding name="tcpBinding">
                <security>
                    <transport>
                        <extendedProtectionPolicy policyEnforcement="Never" />
                    </transport>
                </security>
            </binding>
        </netTcpBinding>
    </bindings>
    <services>
        <service name="WCFServer.WCF">
            <endpoint address="net.tcp://localhost:1111/TcpIHostMonitor" binding="netTcpBinding"
                bindingConfiguration="tcpBinding" name="netTcpEndpoint" contract="WCFServer.IWCFService" />
        </service>
    </services>
</system.serviceModel>

Answer 3

我知道你已经解决了问题，但没有人指出为什么解决了问题，以及导致错误的原因。您的第一个代码的问题是您的程序（类程序）指定了对本身就是“类程序”的类的开放调用，换句话说，它是递归的。难怪它给出了无法打开监听器的错误！这是一件好事！:-)