Web服务返回XML错误

Question

突然之间所有的呼叫到我的Web服务得到这个错误：

2010-11-04 17:42:16,321 [9] ERROR ABCKiosk - System.InvalidOperationException: Response is not well-formed XML. ---> System.Xml.XmlException: Data at the root level is invalid. Line 1, position 1. 
    at System.Xml.XmlTextReaderImpl.Throw(Exception e) 
    at System.Xml.XmlTextReaderImpl.Throw(String res, String arg) 
    at System.Xml.XmlTextReaderImpl.ParseRootLevelWhitespace() 
    at System.Xml.XmlTextReaderImpl.ParseDocumentContent() 
    at System.Xml.XmlTextReaderImpl.Read() 
    at System.Xml.XmlTextReader.Read() 
    at System.Xml.XmlReader.MoveToContent() 
    at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall) 
    at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters) 
    --- End of inner exception stack trace --- 
    at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters) 
    at ABCKiosk.WebServices.Services.ActivityLog(String kioskID, String KTID, String activityType, Int32 errorCodeFromIncentOne, String msgFromIncentOne, DateTime kioskTime) in D:\SMS SHANE\KIOSK\ABCNC_Kiosk\Implementation\Source Code\ABCKioskClient\ABCKiosk\Web References\WebServices\Reference.cs:line 121 
    at ABCKiosk.FrmMain.FrmMain_KeyUp(Object sender, KeyEventArgs e) in D:\SMS SHANE\KIOSK\ABCNC_Kiosk\Implementation\Source Code\ABCKioskClient\ABCKiosk\FrmMain.cs:line 110 

之前每名被罚款:(有谁知道问题出在哪里，以及如何解决这个

？

非常感谢

更新 - 提供更多信息

这里是我的一个Web方法：

[WebMethod(EnableSession = true)] 
     public CommonResult ActivityLog(string kioskID, string KTID, 
      string activityType, int errorCodeFromIncentOne, string msgFromIncentOne, DateTime kioskTime) 
     { 
      XMLParser parser = new XMLParser(Server.MapPath(Constant.XML_CONFIGURATION_FILE_PATH)); 
      CommonResult result = new CommonResult(); 
      try 
      { 
       AccountDAO accountDAO = new AccountDAO(); 
       ActivityLogDAO activityLogDAO = new ActivityLogDAO(); 
       KioskDAO kioskDAO = new KioskDAO(); 

       // check if this kiosk is existed 
       if (!kioskDAO.IsKioskIDExisted(kioskID)) 
       { 
        result.ErrorCode = Constant.ERROR_CODE_KIOSKID_NOT_EXISTED; 
        result.Message = "abc"; 
        return result; 
       } 

       // check if this KTID is existed 
       if (!accountDAO.IsKTIDExisted(KTID)) 
       { 
        result.ErrorCode = Constant.ERROR_CODE_KTID; 
        result.Message = "abc"; 
        return result; 
       } 

       // check if this customer already logged for today 
       if (activityLogDAO.IsLoggedForToday(KTID, DateTime.Now)) 
       { 
        result.ErrorCode = Constant.ERROR_CODE_LOG_LIMIT; 
        result.Message = "abc"; 
        return result; 
       } 

       // begin log this activity to database 
       activityLogDAO.ActivityLog(KTID, kioskID, kioskTime); 

       // return success 
       result.ErrorCode = Constant.ERROR_CODE_SUCCESS; 
       result.Message = "abc"; 
       return result; 
      } 
      catch (Exception e) 
      { 
       result.ErrorCode = Constant.ERROR_CODE_SYSTEM_ERROR; 
       result.Message = "abc"; 
       return result; 
      } 
     } 

UPDATE

我试图运行将WebMethod当地视察返回页面，看到这个页面的源：

<b> Description: </b>An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 



      <br><br> 



      <b> Exception Details: </b>System.InvalidOperationException: Request format is unrecognized for URL unexpectedly ending in '/ActivityLog'.<br><br> 



      <b>Source Error:</b> <br><br> 



      <table width=100% bgcolor="#ffffcc"> 

       <tr> 

        <td> 

         <code> 



An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.</code> 



        </td> 

       </tr> 

      </table> 



      <br> 



      <b>Stack Trace:</b> <br><br> 



      <table width=100% bgcolor="#ffffcc"> 

       <tr> 

        <td> 

         <code><pre> 



[InvalidOperationException: Request format is unrecognized for URL unexpectedly ending in '/ActivityLog'.] 

    System.Web.Services.Protocols.WebServiceHandlerFactory.CoreGetHandler(Type type, HttpContext context, HttpRequest request, HttpResponse response) +405913 

    System.Web.Services.Protocols.WebServiceHandlerFactory.GetHandler(HttpContext context, String verb, String url, String filePath) +212 

    System.Web.Script.Services.ScriptHandlerFactory.GetHandler(HttpContext context, String requestType, String url, String pathTranslated) +47 

    System.Web.HttpApplication.MapHttpHandler(HttpContext context, String requestType, VirtualPath path, String pathTranslated, Boolean useAppConfig) +193 

    System.Web.MapHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +93 

    System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&amp; completedSynchronously) +155 

</pre></code> 

Answer 1

我发现的bug自己，一切都是因为一个单行响应.Write（）在Session_Start（）中搞砸了一切:(