C#实现控件拖动窗口

1. 添加Using 声明

using System.Runtime.InteropServices;

2.在类中加入如下API代码：

 [DllImport("user32")]         private static extern bool ReleaseCapture();

 [DllImport("user32")]         private 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;

3.在需要拖动的Form或控件的MouseDown事件中加入以下代码：

ReleaseCapture();         
SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE +HTCAPTION,0);

完成;