C#窗体随意移动

　　　　　//全区域移动
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);
protected override void OnMouseDown(MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
this.Capture = false;
SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
}
else
{
this.Close(); // 右键可以退出窗体
}
}
　　　　　
　　　　　
　　　　　

　　　　　//标题区域移动
　　　　　[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;

public void ShapedForm_MouseDown(object sender, MouseEventArgs e)
{
ReleaseCapture();
SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
}