C#子視窗與父視窗互動（使用委託和事件）

標籤：

目標：在子視窗Form2上單擊按鈕時向Form1傳遞一組自訂參數，並顯示在父視窗Form1上。

方法：有很多方法，這裡只介紹委託和事件的實現方式。

思路：Form2中定義事件，Form1建立Form2並訂閱事件；Form2觸發事件後傳遞參數到Form1，Form1處理參數。

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Form1代碼如下：

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)

{

// 建立Form2，並添加事件處理函數

Form2 frm = new Form2();

frm.DataChange += new Form2.DataChangeHandler(DataChanged);

frm.ShowDialog();

}

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public void DataChanged(object sender, DataChangeEventArgs args)

{

// 更新表單控制項

textBox1.Text = args.name;

textBox2.Text = args.pass;

}

}

}

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Form2代碼如下：

usingSystem;

usingSystem.Collections.Generic;

usingSystem.ComponentModel;

usingSystem.Data;

usingSystem.Drawing;

usingSystem.Linq;

usingSystem.Text;

usingSystem.Windows.Forms;

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namespaceFormDataInteractive

{

????publicpartialclassForm2 : Form

????{

????????// 定義委託

????????// public delegate void DataChangeHandler(string x); 一次可以傳遞一個string

????????publicdelegatevoidDataChangeHandler(objectsender, DataChangeEventArgs args);

????????// 聲明事件

????????publiceventDataChangeHandler DataChange;

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????????// 呼叫事件函數

????????publicvoidOnDataChange(objectsender, DataChangeEventArgs args)

????????{

????????????if(DataChange != null)

????????????{

????????????????DataChange(this, args);

????????????}

????????}

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????????publicForm2()

????????{

????????????InitializeComponent();

????????}

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????????privatevoidbutton1_Click(objectsender, EventArgs e)

????????{

????????????// 觸發事件， 傳遞自訂參數

????????????OnDataChange(this, newDataChangeEventArgs(textBox1.Text, textBox2.Text));

????????}

????}

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????/// <summary>

????/// 自訂事件參數類型，根據需要可設定多種參數便於傳遞

????/// </summary>

????publicclassDataChangeEventArgs : EventArgs

????{

????????publicstringname { get; set; }

????????publicstringpass { get; set; }

????????publicDataChangeEventArgs(strings1, strings2)

????????{

????????????name = s1;

????????????pass = s2;

????????}

????}

}

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C#子視窗與父視窗互動（使用委託和事件）