wpf 利用 RenderTargetBitmap把控件保存为图片

Stream GetImageFromControl(Control control) { MemoryStream ms = null; DrawingVisual drawingVisual = new DrawingVisual(); using (DrawingContext context = drawingVisual.RenderOpen()) { VisualBrush brush = new VisualBrush(gd) { Stretch = Stretch.None }; context.DrawRectangle(brush, null, new Rect(0, 0, gd.Width, gd.Height)); context.Close(); } //dpi可以自己设定 // 获取dpi方法：PresentationSource.FromVisual(this).CompositionTarget.TransformToDevice RenderTargetBitmap bitmap = new RenderTargetBitmap((int)gd.Width, (int)gd.Height, 96, 96, PixelFormats.Pbgra32); bitmap.Render(drawingVisual); PngBitmapEncoder encode = new PngBitmapEncoder(); encode.Frames.Add(BitmapFrame.Create(bitmap)); ms = new MemoryStream(); encode.Save(ms); return ms; }