问题描述
我有一个 RenderTargetBitmap ，我需要将其转换为 BitmapImage 。请检查下面的代码。
I have a RenderTargetBitmap, I need to convert it to BitmapImage. Please check the code below.
RenderTargetBitmap bitMap = getRenderTargetBitmap();
Image image = new Image();// This is a Image
image.Source = bitMap;
在上面的代码中，我使用了Image。现在，我需要使用BitmapImage。我该怎么做？
In the above code I have used Image.Now I need to use a BitmapImage. How can I do this?
RenderTargetBitmap bitMap = getRenderTargetBitmap();
BitmapImage image = new BitmapImage();// This is a BitmapImage
// how to set bitMap as source of BitmapImage ?
推荐答案
尽管似乎没有必要进行转换将 RenderTargetBitmap 转换为 BitmapImage ，您可以轻松编码 RenderTargetBitmap 放入 MemoryStream 并从该流中解码 BitmapImage 。
Although it doesn't seem to be necessary to convert a RenderTargetBitmap into a BitmapImage, you could easily encode the RenderTargetBitmap into a MemoryStream and decode the BitmapImage from that stream.
有几个在WPF中，下面的示例代码使用 PngBitmapEncoder 。
There are several BitmapEncoders in WPF, the sample code below uses a 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();
}
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