WPF Image and HDC

I had a DLL exporting a function drawing to a HDC. I needed to use that function in my WPF application. This solution needs a reference to System.Drawing.

System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(100, 100);
using (var g = System.Drawing.Graphics.FromImage(bmp))
{
  IntPtr hdc = g.GetHdc();
  //use hdc to draw here
}
var img = new System.Windows.Controls.Image
{
  Source = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap
  (
    bmp.GetHbitmap(), 
    IntPtr.Zero, 
    Int32Rect.Empty,
    System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions()
  )
};
//use img in wpf