C#委托三部曲Demo

因同事委托还不太会用，所以我写了一个小的委托三部曲的Demo。

调用类里的函数自动随机改变值，通过委托刷新到主界面。

 

这是communication类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace DeledgateDemo
{
    public class Communication
    {
        /// <summary>
        /// 委托三部曲
        /// </summary>
        /// <param name="order">指令</param>
        /// <param name="value">值</param>
        public delegate void Evt_Result(string order, string value);//第一步，定义一个委托

        public Evt_Result _Result;//第二步，声明一个委托  //第三步，在主界面绑定委托函数

        public string Order;
        public int Value;
        public Random ra = new Random();//随机函数
        string[] s1 = { "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z" };

        //你通讯类里的接收函数
        public void OnServerReceive()
        {
            Order = s1[ra.Next(0,25)];
            Value = ra.Next(-10,20);
            _Result(Order,Value.ToString());//委托的调用
        }



    }
}

 

这个是主界面的代码，因为跨线程调用控件，我这里用了 InvokeRequired 

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

namespace DeledgateDemo
{
    public partial class FrmMain : Form
    {
        public Communication communication;

        public FrmMain()
        {
            InitializeComponent();

            communication = new Communication();

            communication._Result = Show_result;//第三步，绑定委托函数
        }


        /// <summary>
        /// 绑定的委托函数
        /// </summary>
        /// <param name="order">指令</param>
        /// <param name="value">值</param>
        public void Show_result(string order,string value)
        {
            if (InvokeRequired)
            {
                Invoke(new Communication.Evt_Result(Show_result) , new object[] { order, value });
                return;
            }
            else
            {
                string time = DateTime.Now.ToString("HH:mm:ss") + "_: ";
                if (listBox1.Items.Count > 50)
                {
                    listBox1.Items.RemoveAt(listBox1.Items.Count - 1);
                }
                listBox1.Items.Insert(0, time +"指令是："+ order+"  数值是："+value);
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //这里通过按钮触发通讯类里的接收函数，实际运行时，自动触发接收函数。
            communication.OnServerReceive();
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            communication.OnServerReceive();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (button2.Text=="连续触发")
            {
                timer1.Enabled = true;
                timer1.Interval = 10;
                timer1.Start();
                button2.Text = "停止";
            }
            else
            {
                timer1.Stop();
                button2.Text = "连续触发";
            }
        }
    }
}

非常简单的一个委托Demo。

源码连接，供初学者了解委托。

链接：https://pan.baidu.com/s/1tRRYuuzaCZGRcAiOyDSKGA
提取码：10lj