事件

Form1中:一个lable1用来接受Form2中textbox1的信息,button1用来show出Form2

Form1中代码:

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

namespace WinTest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //单击该按钮时SHOW出第二个窗体
            Form2 fm2 = new Form2();
            fm2.myevent += new Form2.mydelegate(givevalue);//在SHOW出窗体的同时订阅FORM2的事件,调用givevalue()方法.
            fm2.ShowDialog();
        }
        public void givevalue(string text) //用于修改label的方法
        {
            this.label1.Text = text;
        }
    }
}


 1 Form2中:一个textbox1用来输入要传递的值,button1用来触发传递事件
Form2代码:

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

namespace WinTest
{
    public partial class Form2 : Form
    {
        public delegate void mydelegate(string text);//定义一个委托
        public event mydelegate myevent;//定义上诉委托类型的事件

        public Form2()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            //在单击该窗体上的按钮时触发事件
            if (myevent != null)
            {
                myevent(textBox1.Text);
            }
        }
    }
}
原文地址:https://www.cnblogs.com/xiaoyaodijun/p/3945896.html