C#學習筆記(6)委托

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 demo6
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        delegate string StartWorkDelegate();    	//定義委托StartWorkDelegate
        delegate void OffWorkDelegate(string s);	//定義委托OffWorkDelegate
        private void button1_Click(object sender, EventArgs e)  	//單擊上班按鈕執行的動作
        {
            StartOffWork sw = new StartOffWork();   		//實例化StartOffWork類
            /*實例化委托StartWorkDelegate*/
            StartWorkDelegate SWork = new StartWorkDelegate(sw.StartWork);//
            //    StartWorkDelegate SWork = sw.StartWork; 		//也可以使用這條語句實例化  
            label2.Text = SWork();  						//調用委托，結果顯示在窗體上
        }
        private void button2_Click(object sender, EventArgs e)
        {
            /*實例化委托OffWorkDelegate*/
            //OffWorkDelegate OWork = new OffWorkDelegate(StartOffWork.OffWork);
            OffWorkDelegate OWork = StartOffWork.OffWork;     	//關聯到靜態方法
            OWork("19:30"); 						//調用委托，參數為下班時間
        }
        private void timer1_Tick_1(object sender, EventArgs e)  //timer1的Tick事件代碼
        {
            label1.Text = "現在時間：" + DateTime.Now.ToString();
        }
    }
    public class StartOffWork       				//定義管理上下班類StartOffWork
    {
        public string StartWork()   					//實例方法
        {
            if (DateTime.Now <= Convert.ToDateTime("20:30"))		//判斷是否已經上班
            { return "挺早的！"; }   					//返回字符串“挺早的！”
            else
            { return "你遲到了，下次可要來早點哦！"; }
        }
        public static void OffWork(string offworktime) //靜態方法
        {
            if (DateTime.Now > Convert.ToDateTime(offworktime)) 	//判斷是否到了下班時間
            { MessageBox.Show("辛苦了！"); }  			//彈出消息框
            else
            { MessageBox.Show("還沒到下班時間!"); }
        }
    }
}