子窗口打开全屏化显示

 private void HtmlSet_click(object sender, RoutedEventArgs e) // 主窗口中打开子窗口
        {
                Mouse.SetCursor(Cursors.Wait);
                HtmlSetDevice ChildHtmlSetDevice = new HtmlSetDevice();
                ChildHtmlSetDevice.Owner = this;
                ChildHtmlSetDevice.Show();        
        } 
  public HtmlSetDevice() //  子窗口 进行全屏化显示设置
        {
            InitializeComponent();
            this.WindowState = System.Windows.WindowState.Normal;
            //this.WindowStyle = System.Windows.WindowStyle.None;  // 没有边框
            this.ResizeMode = System.Windows.ResizeMode.NoResize;
            this.Topmost = true;
            this.Left = 0.0;
            this.Top = 0.0;
            this.Width = System.Windows.SystemParameters.PrimaryScreenWidth;
            this.Height = System.Windows.SystemParameters.PrimaryScreenHeight;
        }