将RenderTargetBitmap转换为BitmapImage [英] Convert RenderTargetBitmap to BitmapImage

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 BitmapEncoders 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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