处置在C＃中的循环中创建的对象

大家好，
我已提取视频的总框架和保存在输出目录。现在，我已经随着帧没有显示在WPF窗口的ListBox中的所有farmes。在每一帧。

int FramesCount = 0;

List<stackpanel> splist = new List<stackpanel>();				

System.IO.DirectoryInfo myimagesdir = new System.IO.DirectoryInfo(@"E:\\tmp");

foreach(System.IO.FileInfo myimagesfile in myimagesdir.GetFiles("*.jpg"))

{

    FramesCount = FramesCount + 1;

    StackPanel sp = new StackPanel();

    sp.Height = 100; sp.Width = 125;			

									

    Image img = new Image();

    img.Height = 80; img.Width = 100;

    BitmapImage bitimg = new BitmapImage();

					

    bitimg.BeginInit();

    bitimg.UriSource = new Uri(myimagesfile.FullName);

    bitimg.CacheOption = BitmapCacheOption.OnLoad;

					

    bitimg.EndInit();

    img.Source = bitimg;

				

    TextBlock tb = new TextBlock();

    tb.Height = 20; tb.Width = 30; tb.FontSize = 15;

    tb.Text = FramesCount.ToString();

    sp.Children.Add(tb);					

    sp.Children.Add(img);

    splist.Add(sp);								

}

			

Frameslistbox.ItemsSource = splist;