C#无边框窗体的拖动

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;
}
}