C# 从UIElement获取的图像被裁剪为显示的大小
我正在使用以下代码拍摄wpf控件的图像:C# 从UIElement获取的图像被裁剪为显示的大小,c#,wpf,image,image-processing,uielement,C#,Wpf,Image,Image Processing,Uielement,我正在使用以下代码拍摄wpf控件的图像: BitmapEncoder imgEncoder = new PngBitmapEncoder(); RenderTargetBitmap bmpSource = new RenderTargetBitmap((int)element.ActualWidth, (int)element.ActualHeight, 150, 150, PixelFormats.Pbgra32); bmpSource.Render(element); imgEncoder.
BitmapEncoder imgEncoder = new PngBitmapEncoder();
RenderTargetBitmap bmpSource = new RenderTargetBitmap((int)element.ActualWidth, (int)element.ActualHeight, 150, 150, PixelFormats.Pbgra32);
bmpSource.Render(element);
imgEncoder.Frames.Add(BitmapFrame.Create(bmpSource));
using (MemoryStream ms = new MemoryStream())
{
imgEncoder.Save(ms);
bytes = ms.ToArray();
ms.Position = 0;
Image i = Image.FromStream(ms);
i.Save(@"C:\" + Guid.NewGuid().ToString() + "LARGE.png");
}
问题在于ActualHeight/Width
属性给出了渲染的高度和宽度,即显示的部分。我想保存整个控件的图像,即使某些控件在屏幕上不可见,即它被放置在scrollviewer中
如何获取控件的完整大小/高度,以便bmpSource.Render()将整个控件渲染为图像?您可以尝试暂时将控件从其上下文中移除(如果绑定,可能会导致问题),将其转换为可见点,或将其滚动到视图中进行渲染
private static void SaveUsingEncoder(string fileName, FrameworkElement UIElement, BitmapEncoder encoder)
{
int height = (int)UIElement.ActualHeight;
int width = (int)UIElement.ActualWidth;
// These two line of code make sure that you get completed visual bitmap.
// In case your Framework Element is inside the scroll viewer then some part which is not
// visible gets clip.
UIElement.Measure(new System.Windows.Size(width, height));
UIElement.Arrange(new Rect(new System.Windows.Point(), new Point(width, height)));
RenderTargetBitmap bitmap = new RenderTargetBitmap(width,
height,
96, // These decides the dpi factors
96,// The can be changed when we'll have preview options.
PixelFormats.Pbgra32);
bitmap.Render(UIElement);
SaveUsingBitmapTargetRenderer(fileName, bitmap, encoder);
}
private static void SaveUsingBitmapTargetRenderer(string fileName, RenderTargetBitmap renderTargetBitmap, BitmapEncoder bitmapEncoder)
{
BitmapFrame frame = BitmapFrame.Create(renderTargetBitmap);
bitmapEncoder.Frames.Add(frame);
// Save file .
using (var stream = File.Create(fileName))
{
bitmapEncoder.Save(stream);
}
}
将此函数称为
SaveUsingEncoder(fileName, frameworkElement, new PngBitmapEncoder());
希望这会有所帮助。你说的可见点是什么意思,我尝试给它一个新的大小并调用updatelayout(),但它会恢复到原来的大小?可见点是任何保证可见的点,使用ScrollViewer滚动视口通常比将控件移动到视口更容易。