I've created a form with rounded corners using Form.Region. It works, but unfortunately the rounding appears rough. Are there any tricks for smoothing such shaped form corners? I know many applications support this, just not sure how to make it in .NET.
Thanks guys.
There is no good fix for this, regions cannot be anti-aliased. This is inevitable, anti-aliasing only works when you know the background colors so you can blend properly. That's not an option for windows, the background is by design unpredictable. If this is a splash screen then you can fake it by taking a screen shot of the background and drawing your fake window on top of it. Won't work for more than a few seconds.
Best thing to do is to keep the corner radius small so it is not so noticeable. Also use a tool like SysInternals' ZoomIt and take a close look at the rounded corners of a program like Windows Media Player. Note the gray tones it uses to draw the border.
From what I've read online most people end up overriding the forms onpaint event and drawing the region there. This allows them to use GDI+ with antialiasing and make it look much cleaner.
The examples I found:
http://netcode.ru/dotnet/?lang=&katID=30&skatID=283&artID=7833 http://www.xtremevbtalk.com/showthread.php?t=288178
来源：https://stackoverflow.com/questions/4727726/smooth-edges-of-non-rectangular-form-in-net