简洁的 c# 拖动无标题栏窗体

using System.Runtime.InteropServices;

[DllImport("user32.dll")]
    public static extern bool ReleaseCapture();
    [DllImport("user32.dll")]
    public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
    public const int WM_SYSCOMMAND = 0x0112;
    public const int SC_MOVE = 0xF010;
    public const int HTCAPTION = 0x0002;

MouseDown事件中加入如下代码:

private void Form1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
  {
   ReleaseCapture();
   SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
  }