如果（lastSnapshot！= NULL）// writableBitmap对象lastSnapshot
{
     使用（VAR pngStream = GetPngStream（lastSnapshot））//返回流类型
     使用（var文件= File.Create（Path.Combine（ImageFolder，ImageName.png）））
     {
         字节[] = binaryData新的字节[pngStream.Length]
         长读取动作= pngStream.Read（binaryData，0，（INT）pngStream.Length）;
         file.Write（binaryData，0，（int）的pngStream.Length）;
     }
}
 

i save a png file using savedialogfile.But i want to save it in application IMG folder.my code is as follows:

if (lastSnapshot != null)//writableBitmap object lastSnapshot
        {
            var dlg = new SaveFileDialog();
            dlg.DefaultExt = ".png";
            dlg.Filter = "PNG File|*.png";
            if (dlg.ShowDialog() == true)
            {
                using (var pngStream = GetPngStream(lastSnapshot))//return Stream type 
                using (var file = dlg.OpenFile())
                {
                    byte[] binaryData = new Byte[pngStream.Length];
                    long bytesRead = pngStream.Read(binaryData, 0, (int)pngStream.Length);
                    file.Write(binaryData, 0, (int)pngStream.Length);
                    file.Flush();
                    file.Close();
                }
            }
        }

how to do it.anyone helps me greatly appreciated.thanks in advance.save png file in application image folder in silverlight

if (lastSnapshot != null)//writableBitmap object lastSnapshot
{
     using (var pngStream = GetPngStream(lastSnapshot))//return Stream type 
     using (var file = File.Create(Path.Combine("ImageFolder", "ImageName.png")))
     {
         byte[] binaryData = new Byte[pngStream.Length];
         long bytesRead = pngStream.Read(binaryData, 0, (int)pngStream.Length);
         file.Write(binaryData, 0, (int)pngStream.Length);
     }
}