UIElement到图像文件（WP7）

System.Windows.Media.Imaging

StackPanel stack = new StackPanel();
List<Rectangle> recList = new List<Rectangle>();

recList

foreach(var x in recList)
     stack.Children.Add(x);

WriteableBitmap

WriteableBitmap wb = new WriteableBitmap(stack, null);
MemoryStream ms = new MemoryStream();

wb.SaveJpeg(ms, myWidth, myHeight, 0, 100);

MemoryStream

 BitmapImage bmp = new BitmapImage();
 bmp.SetSource(ms);
 image1.Source = bmp;

using (var isoFileStream = new IsolatedStorageFileStream(\"myPicture.jpg\", FileMode.OpenOrCreate, IsolatedStorageFile.GetUserStoreForApplication())) 
{                     
    wb.SaveJpeg(isoFileStream, myWidth, myHeight, 0, 100);                    
}