How to stop flickering on windows form?

Question

I have used below code that will help to stop flickering

protected override CreateParams CreateParams
{
    get
    {
         CreateParams cp = base.CreateParams;
         cp.ExStyle |= 0x02000000;  // Turn on WS_EX_COMPOSITED
         Thread.Sleep(100);
         return cp;
    }
}

but using this my CPU usage goes to 100%.

Please help me. Thanks in advance.

When you say windows form.. do you mean winforms? when does the flickering occur? what controls are on your form? if any tab controls your already in a bad position. the only real solution is to convert to wpf. — Sayse, Jun 09 '14 at 07:24
Do u use the Onpaint event of the form,also check if any one your controls is responsible for this. u can set the DoubleBuffer of the form to true. — Sara S., Jun 09 '14 at 07:44

score 2 · Answer 1 · answered Jun 09 '14 at 07:32

2

Most often than not, just setting the Form's DobuleBuffered property to True will correct flickering and related drawing problems. Doesn't require any specialized code.

Have you given it a try?

enter image description here

answered Jun 09 '14 at 07:32

Pradeep Kumar

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score 1 · Answer 2 · edited May 23 '17 at 12:02

It would be helpful if you posted the code that causes your form to flicker.
without that this is the most general solution I can think of (except for turning off your monitor :0)):

Try using the answer suggested in this SO thread.

Basically you need to:

Create the following class:

class DrawingControl
{
    [DllImport("user32.dll")]
    public static extern int SendMessage(IntPtr hWnd, Int32 wMsg, bool wParam, Int32 lParam);

    private const int WM_SETREDRAW = 11; 

    public static void SuspendDrawing( Control parent )
    {
        SendMessage(parent.Handle, WM_SETREDRAW, false, 0);
    }

    public static void ResumeDrawing( Control parent )
    {
        SendMessage(parent.Handle, WM_SETREDRAW, true, 0);
        parent.Refresh();
    }
 }

In your form add a call before the flickering to SuspendDrawing and after it to ResumeDrawing
Something like:

public void MyFlickeringFunction()
 {
     try
     {
         SuspendDrawing(this);
         /*Your code goes here...*/
     }
     finally
     {
          ResumeDrawing(this)
     }
 }

How to stop flickering on windows form?

2 Answers2