1   //自定义窗体拉伸 2  3         public HwndSource _HwndkaifaSource; 4         private const int WM_SYSCOMMAND = 0x112; 5         [DllImport("user32.dll", CharSet = CharSet.Auto)] 6         private static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam); 7  8         private Dictionary<ResizeDirection, Cursor> cursors = new Dictionary<ResizeDirection, Cursor> 9         {10             {ResizeDirection.Top, Cursors.SizeNS},11             {ResizeDirection.Bottom, Cursors.SizeNS},12             {ResizeDirection.Left, Cursors.SizeWE},13             {ResizeDirection.Right, Cursors.SizeWE},14             {ResizeDirection.TopLeft, Cursors.SizeNWSE},15             {ResizeDirection.BottomRight, Cursors.SizeNWSE},16             {ResizeDirection.TopRight, Cursors.SizeNESW},17             {ResizeDirection.BottomLeft, Cursors.SizeNESW}18         };

 1 public enum ResizeDirection 2         { 3             /// <summary> 4             /// 左 5             /// </summary> 6             Left = 1, 7             /// <summary> 8             /// 右 9             /// </summary>10             Right = 2,11             /// <summary>12             /// 上13             /// </summary>14             Top = 3,15             /// <summary>16             /// 左上17             /// </summary>18             TopLeft = 4,19             /// <summary>20             /// 右上21             /// </summary>22             TopRight = 5,23             /// <summary>24             /// 下25             /// </summary>26             Bottom = 6,27             /// <summary>28             /// 左下29             /// </summary>30             BottomLeft = 7,31             /// <summary>32             /// 右下33             /// </summary>34             BottomRight = 8,35         }

 1         void Window_MouseMove(object sender, MouseEventArgs e) 2         { 3  4             if (Mouse.LeftButton != MouseButtonState.Pressed) 5             { 6                 FrameworkElement element = e.OriginalSource as FrameworkElement; 7                 if (element != null && !element.Name.Contains("Resize")) this.Cursor = Cursors.Arrow; 8             } 9 10         }11 12         private void ResizePressed(object sender, MouseEventArgs e)13         {14 15             FrameworkElement element = sender as FrameworkElement;16             ResizeDirection direction = (ResizeDirection)Enum.Parse(typeof(ResizeDirection), element.Name.Replace("Resize", ""));17 18             this.Cursor = cursors[direction];19             if (e.LeftButton == MouseButtonState.Pressed) ResizeWindow(direction);20 21         }22 23         private void ResizeWindow(ResizeDirection direction)24         {25 26             SendMessage(_HwndkaifaSource.Handle, WM_SYSCOMMAND, (IntPtr)(61440 + direction), IntPtr.Zero);27 28         }

1  this.SourceInitialized += delegate(object sender, EventArgs e)2  {3       this._HwndkaifaSource = PresentationSource.FromVisual((Visual)sender) as HwndSource;4 };5          this.MouseMove += new MouseEventHandler(Window_MouseMove);