[Mono-bugs] [Bug 599465] New: System.Windows.Forms throws NullReferenceException from DoubleBuffer.End

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Sat Apr 24 06:06:26 EDT 2010



           Summary: System.Windows.Forms throws NullReferenceException
                    from DoubleBuffer.End
    Classification: Mono
           Product: Mono: Class Libraries
           Version: 2.6.x
          Platform: x86
        OS/Version: Mac OS X 10.6
            Status: NEW
          Severity: Critical
          Priority: P5 - None
         Component: Windows.Forms
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: stephen.anderson at ruralcoder.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---

User-Agent:       Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_3; en-US)
AppleWebKit/533.2 (KHTML, like Gecko) Chrome/5.0.342.9 Safari/533.2

Exception Source: System.Windows.Forms
Exception Type: System.NullReferenceException
Exception Message: Object reference not set to an instance of an object
Exception Target Site: End

System.Windows.Forms.DoubleBuffer.End(pe As PaintEventArgs)
 LiveProject.exe: N 00418
 System.Windows.Forms.Control.WmPaint(m As Message&)
 LiveProject.exe: N 00421
 System.Windows.Forms.Control.WndProc(m As Message&)
 LiveProject.exe: N 00406
 System.Windows.Forms.Label.WndProc(m As Message&)
 LiveProject.exe: N 00056
 System.Windows.Forms.ControlWindowTarget.OnMessage(m As Message&)
 LiveProject.exe: N 00029
 System.Windows.Forms.ControlNativeWindow.WndProc(m As Message&)
 LiveProject.exe: N 00045
 System.Windows.Forms.NativeWindow.WndProc(hWnd As IntPtr, msg As Msg, wParam
As IntPtr, lParam As IntPtr)
 LiveProject.exe: N 00505

Reproducible: Sometimes

Steps to Reproduce:
1. Launch application that uses double buffering

Actual Results:  
Exception thrown

Expected Results:  
No exception

Stack trace should contain originating form name or something to identify the
form at fault.

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