c# - Capture desktop exclude (under) my active window -

there many questions capture active window or desktop include active window question different:

i want capture desktop under wpf window. created sample project base on following code:

using (var screenbmp = new bitmap((int)elementsize.width,(int)elementsize.height, system.drawing.imaging.pixelformat.format32bppargb)) {     using (var bmpgraphics = graphics.fromimage(screenbmp))     {         bmpgraphics.copyfromscreen((int) topleftpoint.x, (int)topleftpoint.y, 0, 0, screenbmp.size);          return  imaging.createbitmapsourcefromhbitmap(                         screenbmp.gethbitmap(),                         intptr.zero,                         int32rect.empty,                         bitmapsizeoptions.fromemptyoptions());     } } 

it can capture desktop element copyfromscreen result picture of element but want capture desktop under element, not include element in window.

note: element (for example rectangle) background semi-transparent or none-transparent (has image or solid color).

the above code result below picture (the part inside red border).

note: tree desktop background picture & part of application visible in image. window on them.

you can see include rectangle (element) , other controls on but want capture desktop under element, exclude , visual of other elements on it.

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now question how can capture desktop under element in wpf window, in 2 mode such result below pictures? :

• a) include things (windows &...) under window, this:

• b) exclude other things (exclude open windows &...) under window. desktop background , icons (if window on icons). this:

do know special library or api capture desktop in above levels?

note: working platform wpf + .net 4.5