WPF - Graphics.CopyFromScreen returns a black image

Question

The following method is taken from a WinForms app. It simply captures the screen, but I needed to modify it to work in a WPF application. When I use it, it returns a black image

Answer 1

I think the first two params to g.CopyFromScreen should be 0.

Here's code that works for me:

        var size = System.Windows.Forms.Screen.PrimaryScreen.Bounds;
        var capture = new System.Drawing.Bitmap(size.Width, size.Height);

        var g = System.Drawing.Graphics.FromImage(capture);
        g.CopyFromScreen(0, 0, 0, 0, new System.Drawing.Size(size.Width, size.Height));
        g.Dispose();

Answer 2

I believe you need to use Interop and the BitBlt method. This blog explains how this is done, and a follow-on post that shows how to get window borders.