C#：鼠标移动None Form界面

加入命名空间：

using System.Runtime.InteropServices;
using System.Security.Cryptography;

[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;
        #endregion

        private void frm_MouseMove(object sender, MouseEventArgs e)　　//设置form的MouseMove动作为这个就可用了
        {
            //鼠标按下时即可移动None
            ReleaseCapture();
            SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
        }

来自：百度还是博客园的大神，很久，忘记了