Improving redraw performance with threading.

[Kt3]

Is it possible to do this? I have noticed that dragging a .net window around on the screen doesn't refresh as quickly as some of the other applications I have seen, and I was wondering if there was any possible way to use code to fix this. Anyone know if it has been done?

[wossname]

Depends if any graphical operations are being called in the paint events of consituent controls.

If you have a picturebox that draws a complex shape every time the paintbox paints itself then you can save time by drawing it once to a bitmap object behind the scenes and then simply drawing that bitmap to the picturebox in the paint() event.

The extra complexity in threading something like this would probably slow things down further. Although you could thread the actual bitmap drawing quite sucessfully.

[Kt3]

Nope, no graphical operations here. Just a dozen controls on a form that slow down the redraw rate of the form when I drag it across the screen.

[wossname]

Probably not much you can do then. Look into SuspendLayout and ResumeLayout functions, they are usually used when initialising a form but they might be applicable here.