[C# 學習]表單間調用控制項

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一、方法1：

假如有兩個表單，Form_A和Form_B，每個表單裡都有一個按鍵，Button_A和Button_B，要實現單擊Button_A顯示表單B，那麼表單A中Buttom_A的單擊事件的程式應該是：

private void button_A_Click(object sender, EventArgs e){    Form_B  f = new Form_B();    f.Show();}

 

如果希望單擊表單B中的按鍵Button_B，實現改變表單A的背景色，那麼你需要做：

1. Form_B 表單的Class裡添加如下代碼：

public Form_A fb;public Form_B(Form_A  f){    InitializeComponent();    fb = f;}private void button_B_Click(object sender, EventArgs e){    fb.BackColor = Color.Brown;}

 

2. Form_A表單中的Button_A單擊事件變成：

private void button_A_Click(object sender, EventArgs e){    Form_B f = new Form_B(this);    f.Show();}

 

完整程式如下

Form_A：

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 formExam{    public partial class Form_A : Form    {        public Form_A()        {            InitializeComponent();        }        private void Button_A_Click(object sender, EventArgs e)        {            Form_B f = new Form_B(this);            f.Show();        }        private void Form_A_Load(object sender, EventArgs e)        {        }    }}

 

Form_B:

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 formExam{    public partial class Form_B : Form    {        public Form_A fb;        public Form_B(Form_A f)        {            InitializeComponent();            fb = f;        }        private void Button_B_Click(object sender, EventArgs e)        {            fb.BackColor = Color.Brown;        }    }}

 

二、方法2：通過委託實現

1. 在Form_B的Class外定義一個委託類型

 public delegate void ChangeFormColor();

 

2. 在Form_B的Class內定義委託的方法

public event ChangeFormColor ChangeColor;

 

3. Button_B單擊事件為

private void Button_B_Click(object sender, EventArgs e){    ChangeColor();}

 

4. Form_A中的單擊事件為

private void Button_A_Click(object sender, EventArgs e){    Form_B f = new Form_B();    f.ChangeColor += new ChangeFormColor(f_ChangeColor);    f.Show();}

 

5. 編寫改變Form_A 背景色的方法

void f_ChangeColor(){    this.BackColor = Color.Brown;}

 

完整程式如下：

Form_A:

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 formExam{    public partial class Form_A : Form    {        public Form_A()        {            InitializeComponent();        }        private void Button_A_Click(object sender, EventArgs e)        {            Form_B f = new Form_B();            f.ChangeColor += new ChangeFormColor(f_ChangeColor);            f.Show();        }        void f_ChangeColor()        {            this.BackColor = Color.Brown;        }    }}

 

Form_B:

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 formExam{    public delegate void ChangeFormColor();        public partial class Form_B : Form    {        public event ChangeFormColor ChangeColor;        public Form_B()        {            InitializeComponent();        }        private void Button_B_Click(object sender, EventArgs e)        {            ChangeColor();        }    }}