作为FaultException的低级别WCF异常

Question

当我使用无效的操作请求调用WCF服务时，我得到了一个异常。我需要将此异常作为FaultException发送。

我尝试了以下场景：-

• 我使用了IErrorHandler，但ProvideFault函数未命中此服务调用(在其他情况下，它工作正常)。

• 我还使用了消息检查器来处理异常。但是CCD_ 3和CCD_。

  如何将所有类型的异常作为FaultException 发送

请求服务

请求：POST/0710 HTTP/1.1

标头：连接：关闭内容长度：11内容类型：application/soap+xml；charset=utf-8；action="无效：S.O.A.P.：操作…"主机：userpc:9001

正文：

发生异常(来自跟踪日志)

异常类型

System.ServiceModel.CommunicationException, System.ServiceModel, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089

消息

无法识别的消息版本。

堆栈跟踪

System.ServiceModel.Channels.ReceivedMessage.ReadStartEnvelope(XmlDictionaryReader reader)
System.ServiceModel.Channels.BufferedMessage..ctor(IBufferedMessageData messageData, RecycledMessageState recycledMessageState, Boolean[] understoodHeaders, Boolean understoodHeadersModified)
System.ServiceModel.Channels.BufferedMessage..ctor(IBufferedMessageData messageData, RecycledMessageState recycledMessageState)
System.ServiceModel.Channels.TextMessageEncoderFactory.TextMessageEncoder.ReadMessage(ArraySegment`1 buffer, BufferManager bufferManager, String contentType)
System.ServiceModel.Channels.HttpInput.DecodeBufferedMessage(ArraySegment`1 buffer, Stream inputStream)
System.ServiceModel.Channels.HttpInput.ParseMessageAsyncResult.ContinueReading(Int32 bytesRead)
System.ServiceModel.Channels.HttpInput.ParseMessageAsyncResult.DecodeBufferedMessageAsync()
System.ServiceModel.Channels.HttpInput.ParseMessageAsyncResult.BeginParse()
System.ServiceModel.Channels.HttpInput.ParseMessageAsyncResult..ctor(HttpRequestMessage httpRequestMessage, HttpInput httpInput, AsyncCallback callback, Object state)
System.ServiceModel.Channels.HttpInput.BeginParseIncomingMessage(HttpRequestMessage httpRequestMessage, AsyncCallback callback, Object state)
System.ServiceModel.Channels.HttpInput.BeginParseIncomingMessage(AsyncCallback callback, Object state)
System.ServiceModel.Channels.HttpPipeline.EmptyHttpPipeline.BeginParseIncomingMessage(AsyncCallback asynCallback, Object state)
System.ServiceModel.Channels.HttpPipeline.EnqueueMessageAsyncResult..ctor(ReplyChannelAcceptor acceptor, Action dequeuedCallback, HttpPipeline pipeline, AsyncCallback callback, Object state)
System.ServiceModel.Channels.HttpPipeline.EmptyHttpPipeline.BeginProcessInboundRequest(ReplyChannelAcceptor replyChannelAcceptor, Action dequeuedCallback, AsyncCallback callback, Object state)
System.ServiceModel.Channels.HttpRequestContext.BeginProcessInboundRequest(ReplyChannelAcceptor replyChannelAcceptor, Action acceptorCallback, AsyncCallback callback, Object state)
System.ServiceModel.Channels.HttpChannelListener`1.HttpContextReceivedAsyncResult`1.ProcessHttpContextAsync()
System.ServiceModel.Channels.HttpChannelListener`1.HttpContextReceivedAsyncResult`1..ctor(HttpRequestContext requestContext, Action acceptorCallback, HttpChannelListener`1 listener, AsyncCallback callback, Object state)
System.ServiceModel.Channels.HttpChannelListener`1.BeginHttpContextReceived(HttpRequestContext context, Action acceptorCallback, AsyncCallback callback, Object state)
System.ServiceModel.Channels.SharedHttpTransportManager.EnqueueContext(IAsyncResult listenerContextResult)
System.ServiceModel.Channels.SharedHttpTransportManager.OnGetContextCore(IAsyncResult listenerContextResult)
System.ServiceModel.Channels.SharedHttpTransportManager.OnGetContext(IAsyncResult result)
System.Runtime.Fx.AsyncThunk.UnhandledExceptionFrame(IAsyncResult result)
System.Net.LazyAsyncResult.Complete(IntPtr userToken)
System.Net.ListenerAsyncResult.IOCompleted(ListenerAsyncResult asyncResult, UInt32 errorCode, UInt32 numBytes)
System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP)

您可以通过使用以下代码调用任何WCF服务来创建类似的情况

public static string HttpPost(string URI)
{
try
{
var r = (HttpWebRequest) WebRequest.Create(URI);
r.Method = "POST";
r.ContentType = @"application/soap+xml; charset=utf-8; action=""Invalid:S.O.A.P.:Action...""";                           
var ws = new StreamWriter(r.GetRequestStream());
ws.Write("<EmptyXml/>");
ws.Close();
var resp = (HttpWebResponse) r.GetResponse();
var sr = new StreamReader(resp.GetResponseStream());
return sr.ReadToEnd();
}
catch (FaultException ex)
{
//I need to catch low level exception as Fault exception
}
catch (CommunicationException ex)
{
}
catch (Exception ex)
{
Console.WriteLine("Exception : " + ex.Message);
}
return null;
}

Answer 1

由于您使用的是HttpWebRequest，因此您永远不会通过webrequest接收到faultexception。

要获得你的faultexception，你必须从webexception响应中读取它。

=>

try
{
var r = (HttpWebRequest)WebRequest.Create("/S");
r.Method = "POST";
r.ContentType = @"text/json; charset=utf-8; action=""Invalid:S.O.A.P.:Action...""";
var js = new JavaScriptSerializer();
string postData = js.Serialize(new {something = "Hello World"});
r.ContentLength = postData.Length;
var ws = new StreamWriter(r.GetRequestStream());
ws.Write(postData);
ws.Close();
var resp = (HttpWebResponse)r.GetResponse();
var respStream = resp.GetResponseStream();
if (respStream == null) return;
var sr = new StreamReader(respStream);
string s = sr.ReadToEnd();
}
catch (WebException ex)
{
using (var stream = ex.Response.GetResponseStream())
{
if (stream == null) return;
using (var reader = new StreamReader(stream))
{
//At this point i'm just writing it to the console. However her you have your FaultException xml encoded.
Console.WriteLine(reader.ReadToEnd());
}
}
}