C# 实现拖动无边框窗体

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    Point mouseOff;//鼠标移动位置变量            bool leftFlag;//标签是否为左键            private void Form1_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 Form1_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 Form1_MouseUp(object sender, MouseEventArgs e)            {                if (leftFlag)                {                    leftFlag = false;//释放鼠标后标注为false;                }            }

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