Xamarin C# Take picture without open Camera - c#

I have a QrCodeCode with used the libary "Zxing". Now i want to Take a picture of the complete screen inside the QrCodeScanner. The Problem is i dont want to open the Camera. I want to create a Button that just takes a picture.
I Tried to use the Media.Plugin but this one leav's my App and that is not my goal.
EDIT
as best zxing just should capture my actual screen.

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Regards
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