C# - Outputting image to response output stream giving GDI+ error

Question

When outputting an image to the output stream, does it require temporary storage? I get the \"generic GDI+\" error that is usually associated with folder permission error wh

Answer 1

PNGs (and other formats) need to be saved to a seekable stream. Using an intermediate MemoryStream will do the trick:

using (Bitmap image = new Bitmap(context.Server.MapPath("images/stars_5.png")))
{
   using(MemoryStream ms = new MemoryStream())
   {
      image.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
      ms.WriteTo(context.Response.OutputStream);
   }
}