当去掉WinForm的边框时候，鼠标移动窗口的方法

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【方法一】窗体本身进行

#region 鼠标移动窗口

// 位置 - 用于记录鼠标位置
Point downPoint;
// 当鼠标按下时，记录鼠标位置
private void MainForm_MouseDown(object sender, MouseEventArgs e)
{
//Point FrmP = new Point(button1.Left, button1.Top);
////ScreenP返回相对屏幕的坐标 Point ScreenP=this.PointToScreen(FrmP);
downPoint = new Point(e.X, e.Y);
}
// 当鼠标移动是，改变窗体位置
private void MainForm_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
Location = new Point(Location.X + e.X - downPoint.X, Location.Y + e.Y - downPoint.Y);
}

#endregion

【方法二】在窗体控件上进行

#region //鼠标坐标
private int xpos;
private int ypos;
#region panel1在表面，鼠标移动窗体
private void panel1_MouseDown(object sender, MouseEventArgs e)
{
xpos = e.X;
ypos = e.Y;
}

private void panel1_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
this.Left += e.X - this.xpos;
this.Top += e.Y - this.ypos;
}
}
#endregion

【方法三】转载于博客园<小锋刚>

窗体的移动：

bool formMove = false;//窗体是否移动
Point formPoint;//记录窗体的位置

private void Form4_MouseDown(object sender, MouseEventArgs e)//鼠标按下
        {
            formPoint = new Point();
            int xOffset;
int yOffset;
            if (e.Button == MouseButtons.Left)
            {
                xOffset = -e.X - SystemInformation.FrameBorderSize.Width;
                yOffset = -e.Y - SystemInformation.CaptionHeight - SystemInformation.FrameBorderSize.Height;
                formPoint = new Point(xOffset, yOffset);
                formMove = true;//开始移动
            }
        }

private void Form4_MouseMove(object sender, MouseEventArgs e)//鼠标移动
        {
            if (formMove == true)
            {
                Point mousePos = Control.MousePosition;
                mousePos.Offset(formPoint.X, formPoint.Y);
                Location = mousePos;
            }
        }

private void Form4_MouseUp(object sender, MouseEventArgs e)//鼠标松开
        {
            if (e.Button == MouseButtons.Left)//按下的是鼠标左键
            {
                formMove = false;//停止移动
            }
        }

private void panel1_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
this.Left += e.X - this.xpos;
this.Top += e.Y - this.ypos;
}
}

#endregion

【案例】

拖动无边框窗体Form至桌面任何位置
首先建一个Windows应用程序
将Form1的 FormBorderStyle属性设置为None

        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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