C#鼠标拖动任意控件(winform)

 1         using System.Runtime.InteropServices;   2         //并为控件 添加 MouseDown 事件  3  4         // C#鼠标拖动任意控件  5  6         // 利用Windows的API函数：SendMessage 和 ReleaseCapture  7         const uint WM_SYSCOMMAND = 0x0112; 8         const uint SC_MOVE = 0xF010; 9         const uint HTCAPTION = 0x0002;10 11         [DllImport("user32.dll", EntryPoint = "SendMessageA")]12         private static extern int SendMessage(IntPtr hwnd, uint wMsg, uint wParam, uint lParam);13         [DllImport("user32.dll")]14         private static extern int ReleaseCapture();15 16         void ControlMouseDown(object sender, MouseEventArgs e)17         {18             ReleaseCapture();19             SendMessage((sender as Control).Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);20         }