C# 将 RenderTargetBitmap 转换为 BitmapImage
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Convert RenderTargetBitmap to BitmapImage
提问by sharmila
I have a RenderTargetBitmap, I need to convert it to BitmapImage. Please check the code below.
我有一个RenderTargetBitmap，我需要将其转换为BitmapImage. 请检查下面的代码。
RenderTargetBitmap bitMap = getRenderTargetBitmap();
Image image = new Image();// This is a Image
image.Source = bitMap;
In the above code I have used Image.Now I need to use a BitmapImage. How can I do this?
在上面的代码中，我使用了 Image.Now 我需要使用 BitmapImage。我怎样才能做到这一点？
RenderTargetBitmap bitMap = getRenderTargetBitmap();
BitmapImage image = new BitmapImage();// This is a BitmapImage
// how to set bitMap as source of BitmapImage ?
采纳答案by Clemens
Although it doesn't seem to be necessary to convert a RenderTargetBitmapinto a BitmapImage, you could easily encode the RenderTargetBitmapinto a MemoryStreamand decode the BitmapImagefrom that stream.
尽管似乎没有必要将 a 转换RenderTargetBitmap为 a BitmapImage，但您可以轻松地将 a编码RenderTargetBitmap为 aMemoryStream并BitmapImage从该流中解码。
There are several BitmapEncodersin WPF, the sample code below uses a PngBitmapEncoder.
WPF 中有几个BitmapEncoder，下面的示例代码使用PngBitmapEncoder.
var renderTargetBitmap = getRenderTargetBitmap();
var bitmapImage = new BitmapImage();
var bitmapEncoder = new PngBitmapEncoder();
bitmapEncoder.Frames.Add(BitmapFrame.Create(renderTargetBitmap));
using (var stream = new MemoryStream())
{
bitmapEncoder.Save(stream);
stream.Seek(0, SeekOrigin.Begin);
bitmapImage.BeginInit();
bitmapImage.CacheOption = BitmapCacheOption.OnLoad;
bitmapImage.StreamSource = stream;
bitmapImage.EndInit();
}
回答by Иван Гомонюк
private async void Button_Click(object sender, RoutedEventArgs e)
{
RenderTargetBitmap bitMap = new RenderTargetBitmap();
await bitMap.RenderAsync(grid);
Image image = new Image();// This is a Image
image.Source = bitMap;
image.Height = 150;
image.Width = 100;
grid.Children.Add(image);
}
This looks as a simpler solution.
这看起来是一个更简单的解决方案。
