如下：class form1{}和class form2{}，其中form1中有一个button控件与一个textbox控件，我想要做到点击这个BUTTON时，form2中的某个变量能自动赋值为textbox的值

Form1:

using System; 
using System.Collections.Generic; 
using  
using System.Windows.Forms; 
 
namespace FormTest 
{ 
    public partial class Form1 : Form 
    { 
        private bool hasOpenForm = false; 
        public Form1() 
        { 
            InitializeComponent(); 
        } 
 
        private void button1_Click(object sender, EventArgs e) 
        { 
            if (!this.hasOpenForm) 
            { 
                this.hasOpenForm = true; 
                Form2 form = new Form2(); 
                form.StartPosition = FormStartPosition.CenterScreen; 
                form.OnTransferText += new EventHandler<Form2.TransferTestEventArgs>(form_OnTransferText); 
                form.FormClosed += new FormClosedEventHandler(form_FormClosed); 
                form.Show(); 
            } 
        } 
 
        void form_FormClosed(object sender, FormClosedEventArgs e) 
        { 
            this.hasOpenForm = false; 
        } 
 
        void form_OnTransferText(object sender, Form2.TransferTestEventArgs e) 
        { 
            this.textBox1.Text = e._Text; 
        } 
    } 
} 

Form2:

using System; 
using System.Collections.Generic; 
using  
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Windows.Forms; 
 
namespace FormTest 
{ 
    public partial class Form2 : Form 
    { 
        public event EventHandler<TransferTestEventArgs> OnTransferText; 
 
        public Form2() 
        { 
            InitializeComponent(); 
        } 
 
        private void Form2_Load(object sender, EventArgs e) 
        { 
            if (sender != null) 
            { 
                OnTransferText(this, new TransferTestEventArgs(this.textBox1.Text)); 
            } 
        } 
 
        public class TransferTestEventArgs : EventArgs 
        { 
            public readonly string _Text; 
 
            public TransferTestEventArgs(string Text) 
            { 
                _Text = Text; 
            } 
        } 
    } 
} 

form2:
 using System;  
using System.Collections.Generic;  
using   
using System.Data;  
using System.Drawing;  
using System.Linq;  
using System.Text;  
using System.Windows.Forms;  
 
namespace FormTest  
{  
    public partial class Form2 : Form  
    {  
        public event EventHandler<TransferTestEventArgs> OnTransferText;  
 
        public Form2()  
        {  
            InitializeComponent();  
        }  
 
        private void Form2_Load(object sender, EventArgs e)  
        {  
            if (sender != null)  
            {  
                OnTransferText(this, new TransferTestEventArgs(this.textBox1.Text));  
            }  
        }  
 
        public class TransferTestEventArgs : EventArgs  
        {  
            public static string _Text;
 ;  
 
            public TransferTestEventArgs(string Text)  
            {  
                _Text = Text;  
            }  
        }  
    }  
}  
form1中e._text改为form2._text;

精辟！

好！

好！

在Form2对象创建时候把Form1的textbox控件当做参数传给Form2(需要重写一个构造函数)，这样的方法最简单

我来解释一下2楼的方法
1，在Form2中自定义事件句柄OnTransferText，和传递text的消息TransferTestEventArgs
2，在Form1中创建Form2实例时候注册事件处理方法，就是对Form2.TransferTestEventArgs进行处理的方法form_OnTransferText
3，于是在当Form2中OnTransferText事件发生时，会调用Form1的form_OnTransferText进行处理
4，if (sender != null)  {  OnTransferText(this, new TransferTestEventArgs(this.textBox1.Text));} 是事件触发的地方
但是2楼写的方法是将Form2的textbox内容回传给Form1的textbox，跟楼主想要的不符啊
 

收到的鲜花

• zhoufeng1988 于 2009-09-24 11:52 送鲜花  2朵   附言：好人！ 对了，楼主的意思好像就是把Form2中 ...

**********************************************************方法1
中介方（定义委托）——如窗体Form1
C# code
    //定义委托
    public delegate void MyDel(String str);
 
 
服务方（定义事件，引发事件）－－Form1  
C# code
    public partial class Form1 : Form
    {
        //定义事件
        public event MyDel MyEvent;
 
        public Form1()
        {
            InitializeComponent();
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            Form2 f2 = new Form2(this);
            //引发事件  
            MyEvent(this.textBox1.Text);
            f2.Show();
        }
    }
 
 
客户方（订阅事件，处理事件） ——如窗体Form2
C# code
    public partial class Form2 : Form
    {
        public Form2(Form1 f1)
        {
            InitializeComponent();
            //订阅事件
            f1.MyEvent += new MyDel(f1_MyEvent);
        }
 
        //处理事件
        void f1_MyEvent(string str)
        {
            this.label1.Text = str;
        }
    }
**********************************************************方法2
在Form2窗体里做一个属性：
        private string TextCont;
        public string TextCont1
        {
            get { return TextCont; }
            set { TextCont = value; }
        }
然后按钮的click事件：
        private void button1_Click(object sender, EventArgs e)
        {
            this.TextCont1 = textBox_B.Text;
            DialogResult = DialogResult.OK;
        }
最后回到Form1窗体，按钮的click事件：
        private void button1_Click(object sender, EventArgs e)
        {
            Form2 f2 = new Form2();
            if (f2.ShowDialog() == DialogResult.OK)
                TextBox_A.Text = f2.TextCont1;
        }