子表單控制父表單的內容

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//父表單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 WindowsFormsApplication1{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        public void add(string str)        {            textBox1.Text = str;        }        private void button1_Click(object sender, EventArgs e)        {            Form2 f = new Form2();            //事件 賦予方法            f.mydev += add;            f.Show();        }        private void Form1_Load(object sender, EventArgs e)        {        }    }}

　　

//子表單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 WindowsFormsApplication1{    public partial class Form2 : Form    {        public Form2()        {            InitializeComponent();        }        public delegate void mydel(string str);        public event mydel mydev;        private void button1_Click(object sender, EventArgs e)        {
//觸發事件            mydev(textBox1.Text);        }    }}