引自:http://www.cnblogs.com/icewwn/archive/2011/02/21/1960047.html
http://social.msdn.microsoft.com/forums/en-US/wpf/thread/0d04a373-b446-453a-869d-52958e976c81
方法一:
BitmapImage imgSource = new BitmapImage(new Uri("location",UriKind.Relative));
Image image = new Image();
image.Souce = imgSource;
方法二:
MemoryStream ms = new MemoryStream()
----初始化ms------
BitmapImage imgSource = new BitmapImage();
imgSouce.BeginInit();
imgSouce.StreamSouce = new MemoryStream(ms.ToArray());
imgSouce.EndInit();
Image image = new Image();
image.Souce = imgSource;