WPF 窗口自定义拉伸

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   //自定义窗体拉伸

         public HwndSource _HwndkaifaSource;
         private const int WM_SYSCOMMAND = 0x112;
         [DllImport("user32.dll", CharSet = CharSet.Auto)]
         private static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);

         private Dictionary<ResizeDirection, Cursor> cursors = new Dictionary<ResizeDirection, Cursor>
         {
             {ResizeDirection.Top, Cursors.SizeNS},
             {ResizeDirection.Bottom, Cursors.SizeNS},
             {ResizeDirection.Left, Cursors.SizeWE},
             {ResizeDirection.Right, Cursors.SizeWE},
             {ResizeDirection.TopLeft, Cursors.SizeNWSE},
             {ResizeDirection.BottomRight, Cursors.SizeNWSE},
             {ResizeDirection.TopRight, Cursors.SizeNESW},
             {ResizeDirection.BottomLeft, Cursors.SizeNESW}
         };

Register user32.dll

 public enum ResizeDirection
         {
             /// <summary>
             /// 左
             /// </summary>
             Left = ,
             /// <summary>
             /// 右
             /// </summary>
             Right = ,
             /// <summary>
             /// 上
             /// </summary>
             Top = ,
             /// <summary>
             /// 左上
             /// </summary>
             TopLeft = ,
             /// <summary>
             /// 右上
             /// </summary>
             TopRight = ,
             /// <summary>
             /// 下
             /// </summary>
             Bottom = ,
             /// <summary>
             /// 左下
             /// </summary>
             BottomLeft = ,
             /// <summary>
             /// 右下
             /// </summary>
             BottomRight = ,
         }

ResizeDirection

         void Window_MouseMove(object sender, MouseEventArgs e)
         {

             if (Mouse.LeftButton != MouseButtonState.Pressed)
             {
                 FrameworkElement element = e.OriginalSource as FrameworkElement;
                 if (element != null && !element.Name.Contains("Resize")) this.Cursor = Cursors.Arrow;
             }

         }

         private void ResizePressed(object sender, MouseEventArgs e)
         {

             FrameworkElement element = sender as FrameworkElement;
             ResizeDirection direction = (ResizeDirection)Enum.Parse(typeof(ResizeDirection), element.Name.Replace("Resize", ""));

             this.Cursor = cursors[direction];
             if (e.LeftButton == MouseButtonState.Pressed) ResizeWindow(direction);

         }

         private void ResizeWindow(ResizeDirection direction)
         {

             SendMessage(_HwndkaifaSource.Handle, WM_SYSCOMMAND, (IntPtr)( + direction), IntPtr.Zero);

         }

Event

  this.SourceInitialized += delegate(object sender, EventArgs e)
  {
       this._HwndkaifaSource = PresentationSource.FromVisual((Visual)sender) as HwndSource;
 };
          this.MouseMove += new MouseEventHandler(Window_MouseMove);

construction

XAML 属性 :MouseMove="ResizePressed" MouseDown="ResizePressed"