【WPF】WriteableBitmap和BitmapImage的相互转换

public BitmapImage ConvertWriteableBitmapToBitmapImage(WriteableBitmap wbm)

{

    BitmapImage bmImage = new BitmapImage();

    using (MemoryStream stream = new MemoryStream())

    {

        PngBitmapEncoder encoder = new PngBitmapEncoder();

        encoder.Frames.Add(BitmapFrame.Create(wbm));

        encoder.Save(stream);

        bmImage.BeginInit();

        bmImage.CacheOption = BitmapCacheOption.OnLoad;

        bmImage.StreamSource = stream;

        bmImage.EndInit();

        bmImage.Freeze();

    }

    return bmImage;

}

public static class ImageHelpers

{

    public static BitmapImage ToBitmapImage(this WriteableBitmap wbm)

    {

        BitmapImage bmImage = new BitmapImage();

        using (MemoryStream stream = new MemoryStream())

        {

            PngBitmapEncoder encoder = new PngBitmapEncoder();

            encoder.Frames.Add(BitmapFrame.Create(wbm));

            encoder.Save(stream);

            bmImage.BeginInit();

            bmImage.CacheOption = BitmapCacheOption.OnLoad;

            bmImage.StreamSource = stream;

            bmImage.EndInit();

            bmImage.Freeze();

        }

        return bmImage;

    }

}

以上一个普通方法，第二个则是扩展方法。