c# - 接收 HTTP 响应错误时发生错误

Question

在使用 WCF 客户端进行测试时，我的 wcf 服务出现问题。当我调试时，我看到数据从函数返回，但在响应期间出错。有人可以帮我弄清楚我错过了什么吗？

这是我的服务和配置文件:

public List<PO> GetAllPOs()
{
    var data = new List<PO>();
    try
    {
        var manager = new EntityReaderManager<PO>(ConfigurationManager.AppSettings("FilemakerDB"]);
        data = manager.GetEntityList();
    }
    catch (Exception ex)
    {
        ILogger logger = new Logger(typeof(FilemakerDataService)); 
        logger.Error(ex.Message);

    }

   return data;
}

这是配置文件:

<system.serviceModel>    
    <diagnostics>
      <messageLogging logEntireMessage="true" logKnownPii="true" logMalformedMessages="true"
        logMessagesAtServiceLevel="true" logMessagesAtTransportLevel="true"
        maxSizeOfMessageToLog="2147483647" />
      <endToEndTracing propagateActivity="true" activityTracing="false"
        messageFlowTracing="true" />
    </diagnostics>

    <bindings>
    <wsHttpBinding>
      <binding name="Custom.WSHTTPBinding.Configuration" closeTimeout="10:10:00"
        openTimeout="10:10:00" receiveTimeout="10:10:00" sendTimeout="10:10:00"
        maxBufferPoolSize="655360" maxReceivedMessageSize="655360">

        <security mode="None" />
      </binding>
    </wsHttpBinding>
  </bindings>
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="false" />
    <services>
      <service behaviorConfiguration="Custom.ServiceBehavior" name="AerWorldwide.Service.Web.FilemakerData.FilemakerDataService">
        <endpoint address="" binding="wsHttpBinding" bindingConfiguration="Custom.WSHTTPBinding.Configuration"
          name="Custom.WSHTTPBinding.Configuration" contract="AerWorldwide.Service.Web.FilemakerData.IFilemakerDataService">
          <identity>
            <dns value="localhost" />
          </identity>
        </endpoint>
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
      </service>
    </services>
  <behaviors>
    <serviceBehaviors>
      <behavior name="Custom.ServiceBehavior">
        <serviceMetadata httpGetEnabled="true" />
        <serviceDebug includeExceptionDetailInFaults="true" />
      </behavior>
    </serviceBehaviors>
  </behaviors>    
</system.serviceModel>

错误:

Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.
    at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
    at System.Net.PooledStream.Read(Byte[] buffer, Int32 offset, Int32 size)
    at System.Net.Connection.SyncRead(HttpWebRequest request, Boolean userRetrievedStream, Boolean probeRead)
Inner Exception: An existing connection was forcibly closed by the remote host
    at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags) 

Answer 1

首先启用Tracing在您的服务上查看异常的原因。

您还可以考虑增加服务器端和客户端的 ReaderQuotas，以便毫无问题地传递更大的数据。示例如下:

<wsHttpBinding>
      <binding name="Custom.WSHTTPBinding.Configuration" closeTimeout="10:10:00"
        openTimeout="10:10:00" receiveTimeout="10:10:00" sendTimeout="10:10:00"
        maxBufferPoolSize="655360" maxReceivedMessageSize="655360">
         <readerQuotas maxDepth="2147483647" maxStringContentLength="2147483647"
              maxArrayLength="2147483647" maxBytesPerRead="2147483647"
              maxNameTableCharCount="2147483647" />
        <security mode="None" />
      </binding>
    </wsHttpBinding>

我还在您的代码中看到您正在直接传递由 Entity Framework 获取的对象。在某些情况下， Entity Framework 对象不会被反序列化并可能导致异常。创建一个简单的 POCO，然后填充获取的数据并返回 POCO。