Different result when using RenderTargetBitmap

Question

I have a grid (wpf) and want to save the grid as an image. The grid name is gridPrintPanel (WxH: 1800x1200). I tried to use RenderTargetBitmap to get data and save as a file:

string tempFile = @"D:\temp.png";
RenderTargetBitmap renderTargetBitmap = new RenderTargetBitmap(1800, 1200, 0, 0, PixelFormats.Pbgra32);
renderTargetBitmap.Render(ViewInstance.gridPrintPanel);

PngBitmapEncoder pngImage = new PngBitmapEncoder();
pngImage.Frames.Add(BitmapFrame.Create(renderTargetBitmap));
using (Stream fileStream = File.Create(tempFile))
{
      pngImage.Save(fileStream);
}

The problem is: the result image is different when I run the program on 2 different machine with different screen resolution. The machine with full HD screen give me expected result however another machine with screen resolution 1024x768 give an image with less data. My grid contains a datagrid and the second machine give me a datagrid which lost some last rows. The question I want to ask here: Is the resolution of a screen could affect the result ? And how could I do to get the same result i.e the full image on both machine.

score 0 · Answer 1 · answered Aug 13 '15 at 05:15

The problem is the difference of resolution between 2 screens. When I tried to resize the grid to 3600x2400; both machines give unexpected results (missed data). The temp solution for this issue: I resize the grid to 900x600 and when render image (cause it's a vector image) change dpi to 192d

RenderTargetBitmap renderTargetBitmap = new RenderTargetBitmap(1800, 1200, 192d, 192d, PixelFormats.Pbgra32);

Different result when using RenderTargetBitmap

1 Answers1