怎样在C#中实现父窗体向子窗体传值和子窗体向父窗体传值

Posted 2023-05-05

具体是在Form1和Form2中各有一个textbox和button，点击Form1的button将Form1的textbox中的值传入Form2中的textbox中。点击Form2中的button将Form2中的textbox中的值传入Form1中的textbox中，如图：

子窗体按钮事件
ChildWindow child = new ChildWindow() textbox1.Text="我的名字是父窗体给的！" ;//第1步，给子窗体传值了

child.ShowDialog();//第2步，调用ShowDialog

if (child.DialogResult==true)//第3步，然后对DialogResult进行判断

this.Title = child.Title;//子窗体给父窗体传值

父窗体按钮事件
textbox2.Text= "我要给子窗体传值";
this.DialogResult = true;//第3步，首先会话结束 参考技术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 传值练习

public partial class Form1 : Form

public Form1()

InitializeComponent();

//1、利用构造函数由父窗体向子窗体传值
private void button1_Click(object sender, EventArgs e)

Form2 f2 = new Form2(this.textBox1.Text);
f2.Show();


//利用方法由子窗体向父窗体传值
public void chuanzhi(string data)

this.textBox1.Text = data;




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 传值练习

public partial class Form2 : Form

public Form2()

InitializeComponent();

//1、利用构造函数由父窗体向子窗体传值
public Form2(string name)

InitializeComponent();
this.textBox1.Text = name;


//2、利用方法由子窗体向父窗体传值
private void button1_Click(object sender, EventArgs e)

Form1 f1 = new Form1();
f1.chuanzhi(this.textBox1.Text);
f1.Show();



本回答被提问者采纳 参考技术B Form1的代码:
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 MyURLRecond

public partial class Form1 : Form

public Form1()

InitializeComponent();

public Form1(string message)

InitializeComponent();
textBox1.Text = message;


private void button1_Click(object sender, EventArgs e)

Form2 form2 = new Form2(textBox1.Text.Trim());
form2.ShowDialog();
form2.Dispose();



Form2的代码:
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 MyURLRecond

public partial class Form2 : Form

public Form2()

InitializeComponent();

public Form2(string message)

InitializeComponent();
textBox1.Text = message;


private void button1_Click(object sender, EventArgs e)

Form1 form1 = new Form1(textBox1.Text.Trim());
form1.ShowDialog();
form1.Dispose();

c# 不同窗体之间传值和调用

1.子窗体事件刷新父窗体界面值

   子窗体定义委托和事件  

 //声明一个委托
        public delegate void DisplayUpdateDelegate(string str);
        //声明事件
        public event DisplayUpdateDelegate ShowUpdate;
        private void Form2_Load(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (ShowUpdate != null)
            {
                ShowUpdate(textBox1.Text.ToString());
            }
        }

父窗体 

   private void button3_Click(object sender, EventArgs e)
        {
            Form2 _frm2 = new Form2();
            _frm2.ShowUpdate += new Form2.DisplayUpdateDelegate(ShowMessage);
            _frm2.Show();
        }

        private void ShowMessage(string str)
        {
            textBox1.Text = str;
        }

 

2.父窗体的事件刷新子窗体的值

   父窗体代码

  

  public delegate void ChangeSonWindowDelegate(string str);
        ChangeSonWindowDelegate _changeSonWindow;
        private void button1_Click(object sender, EventArgs e)
        {

            Form2 _frm2 = new Form2();
             _changeSonWindow = new ChangeSonWindowDelegate(_frm2.ShowMessage);
            _frm2.Show();

        }
     
        private void button2_Click(object sender, EventArgs e)
        {

            _changeSonWindow(textBox1.Text);

        }

子窗体代码 

        public void ShowMessage(string str)
        {
            textBox1.Text = str;

        }