winform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);//得到变量的值
         leftFlag = true;    //点击左键按下是注释为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;//释放鼠标后标注为false；
     }
 }
 #endregion