C# winform 随意拖动窗体

1 先看效果

2.看代码

 	#region 鼠标按下
        private void lb_Title_MouseDown(object sender, MouseEventArgs e)
        {
            if (!MouseDown)
            {
                MouseDown = true;
                MOuseP = new Point(-e.X,-e.Y);     //e.？以WF窗口左上角原点为坐标轴
            }
        }
        #endregion
        #region 鼠标弹起
        private void lb_Title_MouseUp(object sender, MouseEventArgs e)
        {
            if (MouseDown)
            {
                MouseDown = false;
            }
        }
        #endregion
        #region 鼠标移动
        private void lb_Title_MouseMove(object sender, MouseEventArgs e)
        {
            if (MouseDown)
            {
                Point Mouse = Control.MousePosition;//以屏幕左上角原点为坐标轴
                Mouse.Offset(MOuseP); //偏移量
                this.Location = Mouse;//Mouse：form窗口左上角坐标
            }
        }
        #endregion
​

3 看原因图