C# WinForm 窗体/控件移动

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#region 窗体移动      [System.Runtime.InteropServices.DllImport("user32.dll", EntryPoint = "ReleaseCapture")]      private static extern void ReleaseCapture();      [System.Runtime.InteropServices.DllImport("user32.dll", EntryPoint = "SendMessage")]      private static extern void SendMessage(int hwnd, int wMsg, int wParam, int lParam);      public static void WinControl_MouseDown(this Control c, MouseEventArgs e)      {          if (e.Button == MouseButtons.Left)          {              if (c is Form)              {                  Form f = (Form)c;                  if (f.WindowState != FormWindowState.Normal)                  {                      return;                  }              }              ReleaseCapture();              SendMessage((int)c.Handle, 0xA1, 2, 0);            }      }      #endregion 窗体移动