c# - 自托管 Wcf 服务于 wsdl 但在调用时为 404

Question

我正在尝试自行托管服务的单例实例，但显然我在间接级别上迷路了...

我有一个基地址 http://localhost:8050/。我不太在意服务端点在哪里，只要它是可预测的。目前，我正在尝试使用 /Manage/。

我能够浏览到基址并查看 wsdl。如果我扫描 wsdl，它指向 /Manage/..

<wsdl:service name="EngineService">
    <wsdl:port name="BasicHttpBinding_IEngineService" binding="tns:BasicHttpBinding_IEngineService">
        <soap:address location="http://localhost:8050/Manage/"/>
    </wsdl:port>
</wsdl:service>

当我使用 WcfTestClient 使用 wsdl 时，它列出了所有正确的方法，但调用其中任何一个都会抛出以下异常

System.ServiceModel.EndpointNotFoundException: There was no endpoint listening at http://localhost:8050/Manage that could accept the message. This is often caused by an incorrect address or SOAP action. See InnerException, if present, for more details.

Server stack trace: 
   at System.ServiceModel.Channels.HttpChannelUtilities.ProcessGetResponseWebException(WebException webException, HttpWebRequest request, HttpAbortReason abortReason)
   at System.ServiceModel.Channels.HttpChannelFactory`1.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
   at System.ServiceModel.Channels.RequestChannel.Request(Message message, TimeSpan timeout)
   at System.ServiceModel.Dispatcher.RequestChannelBinder.Request(Message message, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Exception rethrown at [0]: 
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at IEngineService.SupportedAgents()
   at EngineServiceClient.SupportedAgents()

Inner Exception:
The remote server returned an error: (404) Not Found.
   at System.Net.HttpWebRequest.GetResponse()
   at System.ServiceModel.Channels.HttpChannelFactory`1.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)

日志消息显示我的实例方法从未被调用。该服务不会进入故障状态，它只是看起来不存在。

我是这样听的:

    public static ServiceHost Listen<TServiceContract>(
            TServiceContract instance,
            int port,
            string name
        ) {

        //Added this for debugging, was previously just "name"
        string endpoint = String.Format("http://localhost:{0}/{1}/", port, name);

        var svcHost = new ServiceHost(
            instance,
            new Uri[] { new Uri(String.Format("http://localhost:{0}/", port)) });

        /* Snip: Add a Faulted handler but it's never called */

        ServiceEndpoint serviceHttpEndpoint = svcHost.AddServiceEndpoint(
            typeof(TServiceContract),
            new BasicHttpBinding {
                HostNameComparisonMode = HostNameComparisonMode.WeakWildcard
            }, endpoint); /*Using name instead of endpoint makes no difference beyond removing the trailing slash */

        /* Snip: Add a ServiceDebugBehavior with IncludeExceptionDetailInFaults = true */
        /* Snip: Add a ServiceMetadataBehavior with HttpGetEnabled = true */

        try {
            log.Trace("Opening endpoint");
            svcHost.Open();
        } catch () {
            /* Lots of catches for different problems including Exception
             * None of them get hit */
        }


        log.Info("Service contract {0} ready at {1}", typeof(TServiceContract).Name, svcHost.BaseAddresses.First());
        return svcHost;

然后调用Listen()方法如下:

        IEngineService wcfInstance = Resolver.Resolve<IEngineService>();
        service = WcfHoster.Listen(wcfInstance, 8050, "Manage");

如何找出问题所在/进一步调试？

附加信息:服务契约和最小实现:

[ServiceContract]
interface IEngineService {
    [OperationContract]
    List<string> Agents();

    [OperationContract]
    string Test();

    [OperationContract]
    List<string> SupportedAgents();

    [OperationContract]
    string Connect(string AgentStrongName, string Hostname);
}

和实现:

[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)]
class EngineService : IEngineService {
    IAgentManager agentManager;
    public EngineService(IAgentManager AgentManager) {
        log.Debug("Engine webservice instantiating");
        this.agentManager = AgentManager;
    }

    public string Connect(string AgentStrongName, string Hostname) {
        log.Debug("Endpoint requested for [{0}], [{1}]", Hostname, AgentStrongName);
        return agentManager.GetSession(AgentStrongName, Hostname);
    }

    public List<string> Agents() {
        log.Debug("Current agents queried");
        throw new NotImplementedException();
    }

    public List<string> SupportedAgents() {
        log.Debug("Supported agents queried");
        return agentManager.SupportedAgents().ToList();
    }

    public string Test() {
        log.Warn("Test query");
        return "Success!";
    }
}

测试客户端可以看到服务和方法，但是当我点击Invoke...时抛出上面的异常

编辑:本地主机默认解析为 IPv6，所以我尝试在两端明确使用 127.0.0.1。没有区别。

我尝试将上述代码放入一个新项目中，但遇到了同样的问题。在别人的机器上运行整个过程也无济于事。

服务跟踪查看器

运行 service trace在服务器端，然后在查看器中检查结果给出:

Failed to lookup a channel to receive an incoming message. Either the endpoint or the SOAP action was not found.

配置文件:由于我需要可执行文件能够决定在运行时显示哪个 Wcf 服务，因此我在配置文件中没有任何与 Wcf 相关的代码。

Answer 1

这可能是客户端/服务绑定(bind)不匹配。请检查测试客户端绑定(bind)。您还应该通过从 wsdl 生成代理来创建单元测试。

好的。我已尝试重现您的问题，并且我设法通过删除“HostNameComparisonMode = HostNameComparisonMode.WeakWildcard”来调用主机以获得默认的 basichttp 端点。为什么需要这个？