[Casper-SC]

Нашёл решение:

Код:

        public static BitmapImage BitmapSourceToBitmapImage(BitmapSource bitmapSource)
        {
            PngBitmapEncoder encoder = new PngBitmapEncoder();
            MemoryStream memoryStream = new MemoryStream();
            BitmapImage bImg = new System.Windows.Media.Imaging.BitmapImage();
 
            encoder.Frames.Add(BitmapFrame.Create(bitmapSource));
            encoder.Save(memoryStream);
                 
            bImg.BeginInit();
            bImg.StreamSource = new MemoryStream(memoryStream.ToArray());
            bImg.EndInit();
 
            memoryStream.Close();
 
            return bImg;
        }