wpf 将 System.Drawing.Image 转换为 System.Windows.Media.ImageSource 没有结果
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Converting System.Drawing.Image to System.Windows.Media.ImageSource with no result
提问by Julian Kowalczuk
I would like to convert Image to ImageSource in my WPF app. I use Code128 library which works properly (already checked in WinForms app). Function below returns ImageSource with properly size, but nothing is visible.
我想在我的 WPF 应用程序中将 Image 转换为 ImageSource。我使用运行正常的 Code128 库（已在 WinForms 应用程序中检查）。下面的函数返回大小合适的 ImageSource，但什么都不可见。
private ImageSource generateBarcode(string number)
{
var image = Code128Rendering.MakeBarcodeImage(number, 1, false);
using (var ms = new MemoryStream())
{
var bitmapImage = new BitmapImage();
image.Save(ms, ImageFormat.Bmp);
bitmapImage.BeginInit();
ms.Seek(0, SeekOrigin.Begin);
bitmapImage.StreamSource = ms;
bitmapImage.EndInit();
return bitmapImage;
}
}
UPDATE: The best method is one commented by Clemens below. About 4 times faster than using memorystream.
更新：最好的方法是下面克莱门斯评论的方法。大约比使用内存流快 4 倍。
回答by Clemens
You have to set BitmapCacheOption.OnLoadto make sure that the BitmapImage is loaded immediately when EndInit()is called. Without that flag, the stream would have to be kept open until the BitmapImage is actually shown.
您必须设置BitmapCacheOption.OnLoad以确保在EndInit()调用时立即加载 BitmapImage 。如果没有该标志，流将必须保持打开状态，直到实际显示 BitmapImage。
using (var ms = new MemoryStream())
{
image.Save(ms, ImageFormat.Bmp);
ms.Seek(0, SeekOrigin.Begin);
var bitmapImage = new BitmapImage();
bitmapImage.BeginInit();
bitmapImage.CacheOption = BitmapCacheOption.OnLoad;
bitmapImage.StreamSource = ms;
bitmapImage.EndInit();
return bitmapImage;
}
