WPF ElementHost fails to paint with doublebuffering enabled

Question

Hi I am experiencing a similiar problem to this Question.

Whats different for me is that I am using in my WinForms-MainForm the "CreateParams-Method" to force doublebuffering. Code for this is (following e.g. DataGridView draws wrong):

protected override CreateParams CreateParams
{
    get
    {
        // Activate double buffering at the form level.  All child controls will be double buffered as well.
        CreateParams cp = base.CreateParams;
        cp.ExStyle |= 0x02000000;   // WS_EX_COMPOSITED
        return cp;
    }
}

My problem is now, as long as this CreateParams is activated, the content of my WPF-ElementHost in a WinForms-Usercontrol are only drawn when there is a mouseover event.

Short description: The UserControl "opens" but it's transparent. After I move over it with my mouse, e.g. the ComboBoxes get drawn.

As soon as I comment out the CreateParams everything works just fine (with the WPF-ElementHost). Is it possible to just deactivate / use different CreateParams for the WPFElementHost?

Did you ever solve this problem? I'm experiencing the same issue. — Tormod Fjeldskår, Feb 18 '13 at 14:31
@TormodFjeldskår: Nej. I never found a way to solve this. I just commented out the CreateParams-Section for the whole Application. Did you? — basti, Feb 26 '13 at 10:30
No, unfortunately not. Removed the CreateParams code from the form and added it to only those screens that do not host WPF controls. — Tormod Fjeldskår, Feb 26 '13 at 16:00

score 0 · Answer 1 · edited May 23 '17 at 12:21

0

Changing the render mode on the WPF control worked for me:

private void Control_Loaded(object sender, RoutedEventArgs e)
{
    HwndSource hwndSource = PresentationSource.FromVisual(this) as HwndSource;
    HwndTarget hwndTarget = hwndSource.CompositionTarget;
    hwndTarget.RenderMode = RenderMode.SoftwareOnly;
}

edited May 23 '17 at 12:21

Community

1
1

answered Jun 17 '15 at 14:22

Eduardo Wada

2,606
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I can't reproduce this anymore, it's been a while.. ..so sorry for not accepting your answer :/ – basti Jul 08 '15 at 15:41
1

Actually, I found later that this answer has a problem related to graphics drivers and will cause the entire system to crash on some computers http://stackoverflow.com/q/17473857/1102585 , it works fine for most but 1 out of 5 machines I tested crashed with this solution – Eduardo Wada Jul 08 '15 at 17:55

WPF ElementHost fails to paint with doublebuffering enabled

1 Answers1