Problem with double buffering in GDI+

[djkno3]

I'm having a problem double buffering my form. I use SetStyle(ControlStyles.UserPaint, true); SetStyle(ControlStyles.AllPaintingInWmPaint, true); SetStyle(ControlStyles.DoubleBuffer, true); and the last line gives me a System.ArgumentException. The additional info is Invalid argument used... I checked out the MSDN and it says to use them like this. They are inside the Form() constructor. Anybody have any clue why this is happening?

[Nick Parker]

public Form1()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
//
// TODO: Add any constructor code after InitializeComponent call
//
SetStyle(ControlStyles.UserPaint, true); SetStyle(ControlStyles.AllPaintingInWmPaint, true); SetStyle(ControlStyles.DoubleBuffer, true);

}

This code itself does not cause a compile time error, as I placed the code inside a blank application itself and it compiles fine, you may have other issues inside your constructor.

---

Nick Parker

Not everything that can be counted counts, and not everything that counts can be counted. - Albert Einstein

[djkno3]

I figured it out :-D I was looping the call to the OnPaint() and inside I used a graphics object. I mistakenly Dispose()'ed of the PaintEvenArg instead of the graphics object.. I guess it doesn't like that :-D because I took the call to Dispose() out and it works fine now :-D

[Jon Rista]

You have to do it like this: SetStyle(ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint | ControlStyles.DoubleBuffer, true); Each successive call to SetStyle eleminates the previous setting and changes it to the new one. So, essentially, your just calling SetStyle(ControlStyles.DoubleBuffer). Because double buffering has to be used in conjunction with UserPaint and AllPaintingInWmPaint, you get the error Invalid Argument Used. Using a bitwise or, you combine the values of all three into one setting. Hope this helps.