[Débutant] Convertir un icone mahapps en Bitmap

Bonjour,
Je voudrais convertir un icone mahappas en type System.drawing.bitmap pour pouvoir
l'afficher en curseur.

Voici le code qui ne fonctionne pas.

Merci.
Code:
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        public Bitmap GetBitmap(System.Windows.Media.Imaging.BitmapSource bitmapsource)
        {
            //convert image format
            var src = new System.Windows.Media.Imaging.FormatConvertedBitmap();
            src.BeginInit();
            src.Source = bitmapsource;
            src.DestinationFormat = System.Windows.Media.PixelFormats.Bgra32;
            src.EndInit();
 
            //copy to bitmap
            Bitmap bitmap = new Bitmap(src.PixelWidth, src.PixelHeight, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
            var data = bitmap.LockBits(new Rectangle(Point.Empty, bitmap.Size), System.Drawing.Imaging.ImageLockMode.WriteOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
            src.CopyPixels(System.Windows.Int32Rect.Empty, data.Scan0, data.Height * data.Stride, data.Stride);
            bitmap.UnlockBits(data);
 
            return bitmap;
        }
 
        private void button2_Click(object sender, EventArgs e)
        {
            //var icon = new MahApps.Metro.IconPacks.PackIconFontAwesome();
            //icon.Kind = MahApps.Metro.IconPacks.PackIconFontAwesomeKind.AccusoftBrands;
 
            var icon = new MahApps.Metro.IconPacks.PackIconModern();
            icon.Kind = MahApps.Metro.IconPacks.PackIconModernKind.CabinetFiles;
 
            Geometry geo = Geometry.Parse(icon.Data);
            GeometryDrawing gd = new GeometryDrawing();
            gd.Geometry = geo;
            gd.Brush = System.Windows.Media.Brushes.Yellow;//icon.BorderBrush;
            gd.Pen = new System.Windows.Media.Pen(System.Windows.Media.Brushes.Red, 96);
 
            DrawingImage geoImage = new DrawingImage(gd);
            //geoImage.Freeze();
            var img = new System.Windows.Controls.Image();
            img.Source = geoImage;
 
            var bitmap = new System.Windows.Media.Imaging.RenderTargetBitmap(256, 256, 32, 32, PixelFormats.Default);
 
            bitmap.Render(img);
 
            var bmp = GetBitmap(bitmap);
            bmp.Save("e:\\tmp\\a.bmp", ImageFormat.Bmp);
 
            SBmp = bmp;
            panel1.Invalidate();
        }
 
        private void panel1_Paint(object sender, PaintEventArgs e)
        {
            if (SBmp!=null)
            {
                e.Graphics.DrawImage(SBmp, 0, 0);
            }
        }