How to take a screenshot of a WPF control?
A screenshot is a shot of the screen... everything on the screen. What you want is to save an image from a single UIElement
and you can do that using the RenderTargetBitmap.Render
Method. This method takes a Visual
input parameter and luckily, that is one of the base classes for all UIElement
s. So assuming that you want to save a .png file, you could do this:
RenderTargetBitmap renderTargetBitmap =
new RenderTargetBitmap(width, height, 96, 96, PixelFormats.Pbgra32);
renderTargetBitmap.Render(yourMapControl);
PngBitmapEncoder pngImage = new PngBitmapEncoder();
pngImage.Frames.Add(BitmapFrame.Create(renderTargetBitmap));
using (Stream fileStream = File.Create(filePath))
{
pngImage.Save(fileStream);
}
Walter Fabio Simoni
Updated on April 24, 2021Comments
-
Walter Fabio Simoni about 3 years
I created a WPF application using the Bing maps WPF control. I would like to be able to screenshot only the Bing maps control.
Is use this code to make the screenshot:
// Store the size of the map control int Width = (int)MyMap.RenderSize.Width; int Height = (int)MyMap.RenderSize.Height; System.Windows.Point relativePoint = MyMap.TransformToAncestor(Application.Current.MainWindow).Transform(new System.Windows.Point(0, 0)); int X = (int)relativePoint.X; int Y = (int)relativePoint.Y; Bitmap Screenshot = new Bitmap(Width, Height); Graphics G = Graphics.FromImage(Screenshot); // snip wanted area G.CopyFromScreen(X, Y, 0, 0, new System.Drawing.Size(Width, Height), CopyPixelOperation.SourceCopy); string fileName = "C:\\myCapture.bmp"; System.IO.FileStream fs = System.IO.File.Open(fileName, System.IO.FileMode.OpenOrCreate); Screenshot.Save(fs, System.Drawing.Imaging.ImageFormat.Bmp); fs.Close();
My problem:
The
Width
andHeight
appear to be bad (false values). The screenshot produced appear to use bad coordinates.My screenshot:
What I expect:
Why do I get this result? I tried in Release mode, and without Visual Studio, result is the same.