C# 在C中将位图转换为可写位图#

我在应用程序中使用c#。我已将位图直接转换为可写位图。 我不想将位图转换为其他格式

    pdftron.PDF.PDFDraw draw = new pdftron.PDF.PDFDraw();
        using (System.Drawing.Bitmap gdiBitmap = draw.GetBitmap(_pdfDoc.GetPage(page)))
        {

            // System.Drawing.Bitmap myBitmap = BitmapFromWriteableBitmap(target);
            using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(gdiBitmap))
            {
                System.Drawing.Color customColor = System.Drawing.Color.FromArgb(50, System.Drawing.Color.Red);
                System.Drawing.SolidBrush shadowBrush = new System.Drawing.SolidBrush(customColor);
                g.FillRectangles(shadowBrush, new System.Drawing.Rectangle[] { rectangle });
            }
}

---

现在我必须将其转换为可写位图。

首先，您需要从

位图创建
位图源代码，然后您可以从中创建
可写位图

System.Windows.Media.Imaging.BitmapSource bitmapSource =
  System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
  gdiBitmap.GetHbitmap(), IntPtr.Zero, Int32Rect.Empty,
  System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions());
System.Windows.Media.Imaging.WriteableBitmap writeableBitmap = new System.Windows.Media.Imaging.WriteableBitmap(bitmapSource);