C# Winform Dev 任意位置 拖动窗体

// 移动窗体
const int WM_NCLBUTTONDOWN = 0xA1;
const int HT_CAPTION = 0x2;
[DllImport("user32.dll")]
static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);

private void Form2_MouseDown(object sender, MouseEventArgs e)
{
　　if (e.Button == MouseButtons.Left & this.WindowState == FormWindowState.Normal)
　　{
　　　　// 移动窗体
　　　　this.Capture = false;
　　　　SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
　　}
}