Creating WPF BitmapImage from MemoryStream png, gif

Question

I am having some trouble creating a BitmapImage from a MemoryStream from png and gif bytes obtained from a web request. The bytes seem to be downlo

Answer 1

Add bi.CacheOption = BitmapCacheOption.OnLoad directly after your .BeginInit():

BitmapImage bi = new BitmapImage();
bi.BeginInit();
bi.CacheOption = BitmapCacheOption.OnLoad;
...

Without this, BitmapImage uses lazy initialization by default and stream will be closed by then. In first example you try to read image from possibly garbage-collected closed or even disposed MemoryStream. Second example uses file, which is still available. Also, don't write

var byteStream = new System.IO.MemoryStream(buffer);

better

using (MemoryStream byteStream = new MemoryStream(buffer))
{
   ...
}