WPF Saving image from Canvas using RenderTargetBitmap [duplicate] - wpf

Question

I have Grid with three columns and layout is like
radio button | Canvas Control | radio button
For some feature of my application I need to take a screenshot of current view of canvas feature and save into a file.
I am using following method to save canvas to bmp,where I measure and arrange canvas.My problem is after image is saved ,canvas position in original grid is shifted to left,how can I re position my canvas back in grid as it was earlier.
private void SaveCanvasContentToImage(string path, Canvas canvasControl)
{
if (path == null && canvasControl != null) return;
// Save current canvas transform
Transform transform = canvasControl.LayoutTransform;
// reset current transform (in case it is scaled or rotated)
canvasControl.LayoutTransform = null;
// Get the size of canvas
Size size = new Size(canvasControl.Width, canvasControl.Height);
// Measure and arrange the canvas
canvasControl.Measure(size);
canvasControl.Arrange(new Rect(size));
// Create a render bitmap and push the canvas to it
RenderTargetBitmap renderBitmap =
new RenderTargetBitmap(
(int)size.Width,
(int)size.Height,
96d,
96d,
PixelFormats.Pbgra32);
renderBitmap.Render(canvasControl);
// Create a file stream for saving image
using (FileStream outStream = new FileStream(path, FileMode.CreateNew,FileAccess.ReadWrite))
{
// Use bitmap encoder for our data
BitmapEncoder encoder = new BmpBitmapEncoder();
// push the rendered bitmap to it
encoder.Frames.Add(BitmapFrame.Create(renderBitmap));
// save the data to the stream
encoder.Save(outStream);
outStream.Close();
outStream.Dispose();
}
// Restore previously saved layout
canvasControl.LayoutTransform = transform;
}

Answer 1

You may avoid the layout problem by using an intermediate DrawingVisual:
var renderTargetBitmap = new RenderTargetBitmap(
(int)canvasControl.ActualWidth, (int)canvasControl.ActualHeight,
96, 96, PixelFormats.Default);
var visual = new DrawingVisual();
using (var dc = visual.RenderOpen())
{
dc.DrawRectangle(
new VisualBrush(canvasControl),
null,
new Rect(0, 0, canvasControl.ActualWidth, canvasControl.ActualHeight));
}
renderTargetBitmap.Render(visual);