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# 二、C# 实现代码
```C#
public enum ResizeDirection
{
Left = 1,
Right = 2,
Top = 3,
TopLeft = 4,
TopRight = 5,
Bottom = 6,
BottomLeft = 7,
BottomRight = 8
}
public partial class MainWindow : Window
{
private HwndSource _hwndSource;
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.BottomLeft,Cursors.SizeNWSE },
{ ResizeDirection.TopRight,Cursors.SizeNESW },
{ ResizeDirection.BottomRight,Cursors.SizeNESW },
};
public MainWindow()
{
InitializeComponent();
this.SourceInitialized += MainWindow_SourceInitialized;
this.MouseMove += MainWindow_MouseMove;
}
private void MainWindow_MouseMove(object sender, MouseEventArgs e)
{
if (e.OriginalSource is FrameworkElement element && !element.Name.Contains("Resize"))
Cursor = Cursors.Arrow;
}
private void MainWindow_SourceInitialized(object sender, EventArgs e)
{
_hwndSource = PresentationSource.FromVisual((Visual)sender) as HwndSource;
}
private void ResizePressed(object sender, MouseEventArgs e)
{
var 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(_hwndSource.Handle, WM_SYSCOMMAND, (IntPtr)(61440 + direction), IntPtr.Zero);
}
}
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