WCF 服务，在 WCF Svc 主机中工作，不作为 Windows 服务工作

Question

环境：Windows XP、Visual Studio 2010、未安装 IIS。

我开发了一个 WCF 服务作为一个库，在 WCFSvcHost 中托管时可以正常工作；我可以连接到它，更新客户的服务参考，这样就可以了。

不过，我无法将其作为 Windows 服务托管。该服务安装正常，我可以附加到它并中断我的代码。为了调试托管，我已将代码移至 OnResume() （OnStart 不执行任何操作）。

这是我的 OnResume （名称已更改以保护无辜者）：

protected override OnResume()
{
    if (_selfHost == null)
    {
        _selfHost = new ServiceHost(typeof(MyService));
        _selfHost.Open();
    }
}

当单步执行 Open() 方法时，我收到以下异常：

System.InvalidOperationException was unhandled by user code
  Message=The HttpGetEnabled property of ServiceMetadataBehavior is set to true and the HttpGetUrl property is a relative address, but there is no http base address.  Either supply an http base address or set HttpGetUrl to an absolute address.
  Source=System.ServiceModel
  StackTrace:
       at System.ServiceModel.Description.ServiceMetadataBehavior.EnsureGetDispatcher(ServiceHostBase host, ServiceMetadataExtension mex, Uri url, String scheme)
       at System.ServiceModel.Description.ServiceMetadataBehavior.CreateHttpGetEndpoints(ServiceDescription description, ServiceHostBase host, ServiceMetadataExtension mex)
       at System.ServiceModel.Description.ServiceMetadataBehavior.ApplyBehavior(ServiceDescription description, ServiceHostBase host)
       at System.ServiceModel.Description.ServiceMetadataBehavior.System.ServiceModel.Description.IServiceBehavior.ApplyDispatchBehavior(ServiceDescription description, ServiceHostBase serviceHostBase)
       at System.ServiceModel.Description.DispatcherBuilder.InitializeServiceHost(ServiceDescription description, ServiceHostBase serviceHost)
       at System.ServiceModel.ServiceHostBase.InitializeRuntime()
       at System.ServiceModel.ServiceHostBase.OnBeginOpen()
       at System.ServiceModel.ServiceHostBase.OnOpen(TimeSpan timeout)
       at System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
       at System.ServiceModel.Channels.CommunicationObject.Open()
       at MyService.StartService()
       at MyService.OnContinue()
       at System.ServiceProcess.ServiceBase.DeferredContinue()
  InnerException: 

更改我的配置文件似乎无法解决问题：

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <startup useLegacyV2RuntimeActivationPolicy="true">
    <supportedRuntime version="v4.0" />
  </startup>
  <system.web>
    <compilation debug="true" />
  </system.web>
  <system.serviceModel>
    <services>
      <service name="MyService">
        <host>
          <baseAddresses>
            <add baseAddress="http://localhost:8732/MyService/" />
          </baseAddresses>
        </host>
        <endpoint address="" binding="wsHttpBinding" contract="MyLib.IMyService">
          <identity>
            <dns value="localhost" />
          </identity>
        </endpoint>
        <endpoint address="http://localhost:8732/MyService/mex" binding="mexHttpBinding" contract="IMetadataExchange" />
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior>
          <serviceMetadata httpGetEnabled="True" />
          <serviceDebug includeExceptionDetailInFaults="False" />
        </behavior>
      </serviceBehaviors>
    </behaviors>
  </system.serviceModel>
</configuration>

作为测试，我尝试过将 httpGetEnabled 设置为 False 并删除 mex 端点，但这只会将问题转移到其他地方：错误消息消失并且服务启动，但我的客户端无法调用该服务：

System.ServiceModel.EndpointNotFoundException was caught
  Message=There was no endpoint listening at http://localhost:8732/MyService/ that could accept the message. This is often caused by an incorrect address or SOAP action. See InnerException, if present, for more details.
[...]

  InnerException: System.Net.WebException
       Message=The remote server returned an error: (400) Bad Request.
       Source=System
       StackTrace:
            at System.Net.HttpWebRequest.GetResponse()
            at System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
       InnerException: 

有帮助吗？

Answer 1

知道了。

我错误地从配置文件中复制了相关部分，不是一次，而是两次（在 Windows 服务和控制台应用程序中）。

谢谢特里。你让我沿着正确的思路思考。