I want to create a BitmapImage with a desired resolution from an XAML (text) file. how can I do that?
thanks.
To load your Xaml file:
Stream s = File.OpenRead("yourfile.xaml");
Control control = (Control)XamlReader.Load(s);
And creating the BitmapImage:
public static void SaveImage(Control control, string path)
{
using (MemoryStream stream = new MemoryStream())
{
GenerateImage(element, stream);
Image img = Image.FromStream(stream);
img.Save(path);
}
}
public static void GenerateImage(Control control, Stream result)
{
//Set background to white
control.Background = Brushes.White;
Size controlSize = RetrieveDesiredSize(control);
Rect rect = new Rect(0, 0, controlSize.Width, controlSize.Height);
RenderTargetBitmap rtb = new RenderTargetBitmap((int)controlSize.Width, (int)controlSize.Height, IMAGE_DPI, IMAGE_DPI, PixelFormats.Pbgra32);
control.Arrange(rect);
rtb.Render(control);
PngBitmapEncoder png = new PngBitmapEncoder();
png.Frames.Add(BitmapFrame.Create(rtb));
png.Save(result);
}
private static Size RetrieveDesiredSize(Control control)
{
control.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
return control.DesiredSize;
}
Make sure to include the right libraries! The classes are located in System.Windows.Media
.
Hope this helps!
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