移动窗体

首先将窗体的FormBorderStyle设置为None,不然在移动的时候会出现晃动。
上代码：

#region 拖动窗体的实现
        private Point mouseOff;//鼠标移动位置变量
        private bool leftFlag;//标签是否为左键
        private void FrmMain_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                mouseOff = new Point(-e.X, -e.Y);//得到变量的值
                leftFlag = true;//点击左键按下时标注为true
            }
        }

        private void FrmMain_MouseMove(object sender, MouseEventArgs e)
        {
            if (leftFlag)
            {
                Point mouseSet = Control.MousePosition;
                mouseSet.Offset(mouseOff.X, mouseOff.Y);//设置移动后的位置
                Location = mouseSet;
            }
        }  

        private void FrmMain_MouseUp(object sender, MouseEventArgs e)
        {
            if (leftFlag)
            {
                leftFlag = false;//释放鼠标后，标注为false
            }
        }
        #endregion