Question

当我尝试使用WCF测试客户端调用我的WCF方法时，收到以下错误消息：

Failed to invoke the service. Possible causes: The service is offline or 
inaccessible; the client-side configuration does not match the proxy; the existing
proxy is invalid. Refer to the stack trace for more detail. You can try to recover
starting a new proxy, restoring to default configuration, or refreshing the 
service.

The underlying connection was closed: The connection was closed unexpectedly.

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 MyApi.GetStuff(String[] stuff)
   at IMyApi.GetStuff(String[] stuff)

Inner Exception:
The underlying connection was closed: The connection was closed unexpectedly.
   at System.Net.HttpWebRequest.GetResponse()
   at System.ServiceModel.Channels.HttpChannelFactory`1.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)

我的方法正在测试中，所以我知道异常不会从方法内部抛出。我还有一个拦截器Interceptor: Attribute, IOperationBehavior, IParameterInspector，其AfterCall方法报告拦截器已到达。从异常消息，单元测试和拦截器看来，在调用方法之后，当服务尝试（但是失败）发送响应时异常以某种方式被抛出，这似乎很清楚。

我正在使用Visual Studio对WCF的内置支持。我没有做任何事情把它放在IIS上。 API中的其他方法似乎工作得很好 - 只是那个方法没有。出了什么问题？

编辑：经过一些调试后，我发现以下代码重现了我的问题。

[ServiceContract]
public class TestService
{
    [OperationContract]
    public MyClass DoWork()
    {
        return new MyClass()
        {
            Str = "hello"
        };
    }
}

[DataContract]
public class MyClass
{
    [DataMember]
    public string Str { get; set; }

    [DataMember]
    public string StrPlus
    {
        get { return Str + " again!"; }
    }
}

为什么添加StrPlus会抛出异常？

Answer 1

事实证明，不支持get-only属性作为数据成员。连接被切断的原因仍然是个谜。通常，WCF会返回错误文档。

WCF: Exposing readonly DataMember properties without set?您可以添加一个投注NotSupportedException。

的setter

即使调用了方法，WCF服务也不会发送HTTP响应

1 个答案: