[Mono-bugs] [Bug 328681] New: OnPaint with double buffering goes wrong

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Wed Sep 26 15:46:15 EDT 2007


           Summary: OnPaint with double buffering goes wrong
           Product: Mono: Class Libraries
           Version: 1.2
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Windows.Forms
        AssignedTo: mono-bugs at ximian.com
        ReportedBy: bart.jansen at etro.vub.ac.be
         QAContact: mono-bugs at ximian.com
          Found By: ---

Description of Problem:
It seems that the OnPaint method is not called correctly on UserControls when
using double buffering.

See code below: if the two lines are uncommented, the "control painted"
text is not shown after minimizing/maximizing for instance.  Without double
buffering the text is shown correctly.

public class MyControl : UserControl
        public MyControl()
            this.Size = new Size(100, 100);
            //SetStyle(ControlStyles.OptimizedDoubleBuffer, true); // do double
            //SetStyle(ControlStyles.AllPaintingInWmPaint, true);

        protected override void OnPaint(PaintEventArgs e)
            Console.WriteLine("control painted");

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