Black Border While Resizing

问题:

Im beginning in my journey of learning WPF. After a few days of coding I see that whenever I resize any WPF form I get a black border on the bottom and right while resizing, like an artifact, as if the screen is too slow. When working with winforms I never noticed this.

Like so :

Is this a known problem? any simple workaround?

EDIT 1:

Seems its related to the graphics driver, I only work on laptops with weakish gfx cards, so does anyone else have this issue? (Im also using Win7 SP1)

回答1:

If you resize a window it has to redraw. This takes some time and also it occurs after the window manager already resized your window and shows it; in that case you'll get a black border in WPF and one with the normal window background (grey, usually) in Windows Forms.

Usually all you can hope for there is that the computer is fast enough with the redraw to not show it.

回答2:

It's a known problem, and it's unlikely that it will be fixed. There is a work-around that reduces the impact of this problem if your background is sufficiently uniform: https://stackoverflow.com/a/14309002/33080

My understanding of the underlying cause is that WPF controls lag behind on resizes: WPF draws them in the "wrong" location briefly. See the linked question for a demonstration.