[C# 学习]窗体间调用控件

一、方法1：

假如有两个窗体，Form_A和Form_B，每个窗体里都有一个按键，Button_A和Button_B，要实现单击Button_A显示窗体B，那么窗体A中Buttom_A的单击事件的程序应该是：

private void button_A_Click(object sender, EventArgs e)

{

    Form_B  f = new Form_B();

    f.Show();

}

如果希望单击窗体B中的按键Button_B，实现改变窗体A的背景色，那么你需要做：

1. Form_B 窗体的Class里添加如下代码：

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窗体中的Button_A单击事件变成：

private void button_A_Click(object sender, EventArgs e)

{

    Form_B f = new Form_B(this);

    f.Show();

}

完整程序如下

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：通过委托实现

1. 在Form_B的Class外定义一个委托类型

 public delegate void ChangeFormColor();

2. 在Form_B的Class内定义委托的方法

public event ChangeFormColor ChangeColor;

3. Button_B单击事件为

private void Button_B_Click(object sender, EventArgs e)

{

    ChangeColor();

}

4. Form_A中的单击事件为

private void Button_A_Click(object sender, EventArgs e)

{

    Form_B f = new Form_B();

    f.ChangeColor += new ChangeFormColor(f_ChangeColor);

    f.Show();

}

5. 编写改变Form_A 背景色的方法

void f_ChangeColor()

{

    this.BackColor = Color.Brown;

}

完整程序如下：

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();

        }

    }

} 

[C# 学习]窗体间调用控件