窗体移动

#region 窗体移动
private Point mouseOff;//鼠标移动位置变量
private bool leftFlag;//标签是否为左键
private void Frm_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
mouseOff = new Point(-e.X, -e.Y);
leftFlag = true;
}
}
private void Frm_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 Frm_MouseUp(object sender, MouseEventArgs e)
{
if (leftFlag)
{
leftFlag = false;

}
}

#endregion

原文：https://www.cnblogs.com/GY66520/p/12129546.html