C#中无边框窗体拖动

        //定义一个bool变量标识是否拖动窗体
        private bool isMove = false;
        //记录鼠标的位置
        private Point point;

        /// <summary>
        /// 窗体的鼠标按下事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            isMove = true;
            //记录鼠标的位置
            point = e.Location;
        }        

        /// <summary>
        /// 窗体的鼠标移动事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Form1_MouseMove(object sender, MouseEventArgs e)
        {
            //是否移动窗体
            if (isMove)
            {
                //记录鼠标移动后的值
                Point p = e.Location;
                //计算鼠标按下和移动后的距离
                int x = p.X - point.X;
                int y = p.Y - point.Y;
                //窗体的位置
                this.Location = new Point(this.Location.X + x, this.Location.Y + y);
            }
        }

        /// <summary>
        /// 鼠标弹起事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Form1_MouseUp(object sender, MouseEventArgs e)
        {
            //不允许在移动窗体
            isMove = false;
        }

Demo下载地址：

无边框拖动窗体.zip