C# 表單 focus 偵測 事件 [C# winform focus EVENT]

資料來源: https://www.daniweb.com/programming/software-development/threads/349769/c-winform-getting-loosing-focus

http://kyleap.blogspot.com/2014/01/c-win-formgotfocuslostfocusfocusbutton.html

Code:[ 表單/元件 獲得駐點(焦點)的語法 Object.Focus(); ]

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace CS_VPOS
{
    public partial class SysMenu : Form
    {
        public SysMenu()
        {
            InitializeComponent();
            this.GotFocus += new EventHandler(SysMenu_GotFocus);//事件表沒有可以設定
            this.LostFocus += new EventHandler(SysMenu_LostFocus);
        }
        private void SysMenu_GotFocus(object sender, EventArgs e)
        {
            //
        }
        private void SysMenu_LostFocus(object sender, EventArgs e)//使用Show顯示才有可能被觸發
        {
            //把SHOW顯示效果變成ShowDialog ~ this.Focus();
            this.Close();//失去焦點就關閉視窗
        }
        private void SysMenu_Load(object sender, EventArgs e)
        {

        }
    }
}