目标：在子窗口Form2上单击按钮时向Form1传递一组自定义参数，并显示在父窗口Form1上。
方法：有很多方法，这里只介绍委托和事件的实现方式。
思路：Form2中定义事件，Form1创建Form2并订阅事件；Form2触发事件后传递参数到Form1，Form1处理参数。
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Form1代码如下：
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;
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namespace FormDataInteractive
{
/// <summary>
/// powered by shadu {at} foxmail.com
/// </summary>
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
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private void button1_Click(object sender, EventArgs e)
{
// 创建Form2，并添加事件处理函数
Form2 frm = new Form2();
frm.DataChange += new Form2.DataChangeHandler(DataChanged);
frm.ShowDialog();
}
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public void DataChanged(object sender, DataChangeEventArgs args)
{
// 更新窗体控件
textBox1.Text = args.name;
textBox2.Text = args.pass;
}
}
}
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Form2代码如下：
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;
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namespace
FormDataInteractive
{
????public
partial
class
Form2 : Form
????{
????????// 定义委托
????????// public delegate void DataChangeHandler(string x); 一次可以传递一个string
????????public
delegate
void
DataChangeHandler(object
sender, DataChangeEventArgs args);
????????// 声明事件
????????public
event
DataChangeHandler DataChange;
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????????// 调用事件函数
????????public
void
OnDataChange(object
sender, DataChangeEventArgs args)
????????{
????????????if
(DataChange != null)
????????????{
????????????????DataChange(this, args);
????????????}
????????}
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????????public
Form2()
????????{
????????????InitializeComponent();
????????}
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????????private
void
button1_Click(object
sender, EventArgs e)
????????{
????????????// 触发事件， 传递自定义参数
????????????OnDataChange(this, new
DataChangeEventArgs(textBox1.Text, textBox2.Text));
????????}
????}
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????/// <summary>
????/// 自定义事件参数类型，根据需要可设定多种参数便于传递
????/// </summary>
????public
class
DataChangeEventArgs : EventArgs
????{
????????public
string
name { get; set; }
????????public
string
pass { get; set; }
????????public
DataChangeEventArgs(string
s1, string
s2)
????????{
????????????name = s1;
????????????pass = s2;
????????}
????}
}
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