[Mono-bugs] [Bug 350621] New: WebClient does not make use of UploadDataCompletedEventArgs.Error

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Mon Dec 24 14:27:20 EST 2007


           Summary: WebClient does not make use of
           Product: Mono: Class Libraries
           Version: SVN
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Major
          Priority: P5 - None
         Component: System
        AssignedTo: mono-bugs at ximian.com
        ReportedBy: jhurliman at metaverseindustries.com
         QAContact: mono-bugs at ximian.com
          Found By: Other

The following code demonstrates the problem. If the server you are executing an
UploadDataAsync() command to returns an error code, it throws an unhandled
exception somewhere in the mono class libraries that cannot be captured by user
code. Actually throwing the exception is different behavior from .NET though,
it seems the correct behavior is to fire the callback with
UploadDataCompletedEventArgs.Error set to the exception that occurred.

using System;
using System.Net;

namespace webclientbug
    class webclientbug
        const string URI = "http://www.google.com/";

        static void Main(string[] args)
            // Some random bytes. Google will return a 501 so this isn't
            byte[] data = new byte[] { 0x01, 0x01, 0x01, 0x01 };

            WebClient request = new WebClient();
            request.UploadProgressChanged += new
            request.UploadDataCompleted += new
            try { request.UploadDataAsync(new Uri(URI), data); }
            catch (Exception) { Console.WriteLine("Caught the exception!"); }


        static void request_UploadProgressChanged(object sender,
UploadProgressChangedEventArgs e)
            Console.WriteLine("Upload progress changed");

        static void request_UploadDataCompleted(object sender,
UploadDataCompletedEventArgs e)
            Console.WriteLine("Upload data completed");

Expected Output:
Either "Caught the exception!" or firing the callback with
UploadDataCompletedEventArgs.Error set to the 501 error, which would just print
"Upload data completed" in this example.

Actual Output:
Unhandled Exception: System.Net.WebException: The remote server returned an
error: (501) Not Implemented.
  at System.Net.HttpWebRequest.CheckFinalStatus (System.Net.WebAsyncResult
result) [0x00000] 
  at System.Net.HttpWebRequest.SetResponseData (System.Net.WebConnectionData
data) [0x00000]

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