我有这堂课，
public class ImageBox : Grid
{
Image imgclose; public String path;
List<ImageBox> ImageBoxes;
public ImageBox(string label,List<ImageBox> ImBox)
{
this.ImageBoxes = ImBox;
imgclose = new Image();
imgclose.Source = new System.Windows.Media.Imaging.BitmapImage(new Uri("pack://application:,,,/Close.ico"));
imgclose.Width = 20; imgclose.Height = 20; imgclose.Cursor = Cursors.Hand; imgclose.HorizontalAlignment = System.Windows.HorizontalAlignment.Right; imgclose.VerticalAlignment = System.Windows.VerticalAlignment.Top;
imgclose.Visibility = System.Windows.Visibility.Hidden;
imgclose.MouseLeftButtonDown += new MouseButtonEventHandler(imgclose_MouseLeftButtonDown);
this.MouseEnter += new MouseEventHandler(Blank_MouseEnter);
this.MouseLeave += new MouseEventHandler(Blank_MouseLeave);
this.Height = 100; this.Width = 100;
try
{
System.Windows.Forms.OpenFileDialog open = new System.Windows.Forms.OpenFileDialog();
path = open.FileName.Replace(Directory.GetCurrentDirectory(), "");
this.Background = new System.Windows.Media.ImageBrush(new System.Windows.Media.Imaging.BitmapImage(new Uri(label)));
path = label;
}
catch(Exception e)
{
MessageBox.Show(e.ToString());
}
Grid.SetColumn(imgclose, 0); Grid.SetRow(imgclose, 1);
this.Children.Add(imgclose);
ContextMenu contextMenu1 = new ContextMenu();
MenuItem conitem1 = new MenuItem() { Header = "Send to back" }; conitem1.Click += new System.Windows.RoutedEventHandler(conitem1_Click);
MenuItem conitem2 = new MenuItem() { Header = "Bring to Front" }; conitem2.Click += new System.Windows.RoutedEventHandler(conitem2_Click);
contextMenu1.Items.Add(conitem1); contextMenu1.Items.Add(conitem2);
this.ContextMenu = contextMenu1;
}
void conitem1_Click(object sender, EventArgs e)
{
Canvas.SetZIndex(this, (Canvas.GetZIndex(this) - 1));
}
void conitem2_Click(object sender, EventArgs e)
{
Canvas.SetZIndex(this, (Canvas.GetZIndex(this) + 1));
}
void Blank_MouseEnter(object sender, MouseEventArgs e)
{
imgclose.Visibility = System.Windows.Visibility.Visible;
}
void Blank_MouseLeave(object sender, MouseEventArgs e)
{
imgclose.Visibility = System.Windows.Visibility.Hidden;
}
void imgclose_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
if (System.Windows.MessageBox.Show("Are you sure?", "Confirm", System.Windows.MessageBoxButton.OKCancel, System.Windows.MessageBoxImage.Question) == System.Windows.MessageBoxResult.OK)
{
ImageBoxes.Remove(this);
(this.Parent as System.Windows.Controls.Canvas).Children.Remove(this);
}
else
{
}
}
}
此类显示图像（从对话框中选择）。
如何修改它以使其播放视频文件？更准确地说，我应该如何修改该行
this.Background = new System.Windows.Media.ImageBrush(new System.Windows.Media.Imaging.BitmapImage(new Uri(label)));
path = label;
以便它播放视频文件。