事件转载自（http://www.cnblogs.com/zengshunyou/archive/2009/06/16/1504475.html）

IT淘沙者

用事件注册实现窗口之间传值

事件和数据定义:

 1using System;
 2using System.Collections.Generic;
 3using System.Text;
 4
 5namespace WindowsApplication1
 6{
 7    public class MyEventArgs : EventArgs
 8    {
 9        private string _eventTag;
10
11        public MyEventArgs(string eventTag)
12        {
13            this._eventTag = eventTag;
14        }
15
16        public string EventTag
17        {
18            get
19            {
20                return this._eventTag;
21            }
22        }
23    }
24
25    public class MyData
26    {
27        public delegate void DataChanged(object sender, MyEventArgs e);
28        public event DataChanged DataChangedEvent;
29
30        private string _data;
31
32        public MyData(string data)
33        {
34            this._data = data;
35        }
36
37        public string Data
38        {
39            get
40            {
41                return this._data;
42            }
43            set
44            {
45                this._data = value;
46
47                if (this.DataChangedEvent != null)
48                {
49                    MyEventArgs myeventArags = new MyEventArgs(this._data);
50
51                    DataChangedEvent(this, myeventArags);
52                }
53            }
54        }
55    }
56}
57

父窗体MainForm代码如下:

 1using System;
 2using System.Collections.Generic;
 3using System.ComponentModel;
 4using System.Data;
 5using System.Drawing;
 6using System.Text;
 7using System.Windows.Forms;
 8
 9namespace WindowsApplication1
10{
11    public partial class MainForm : Form
12    {
13        private MyData _data = new MyData("Init value");
14
15        public MainForm()
16        {
17            InitializeComponent();
18            _data.DataChangedEvent += new MyData.DataChanged(_data_DataChangedEvent);
19            SForm1 f1 = new SForm1();
20            SForm2 f2 = new SForm2();
21
22            f1.Data = _data;
23            f2.Data = _data;
24
25            f1.Show();
26            f2.Show();
27        }
28
29        void _data_DataChangedEvent(object sender, MyEventArgs e)
30        {
31            this.textBox1.Text = e.EventTag;
32        }
33
34        private void button1_Click(object sender, EventArgs e)
35        {
36            this._data.Data = this.textBox1.Text;
37        }
38
39
40    }
41}

子窗体SForm1代码(SForm2的代码和SForm1的代码相同):

 1using System;
 2using System.Collections.Generic;
 3using System.ComponentModel;
 4using System.Data;
 5using System.Drawing;
 6using System.Text;
 7using System.Windows.Forms;
 8
 9namespace WindowsApplication1
10{
11    public partial class SForm1 : Form
12    {
13        private MyData _data;
14
15        public SForm1()
16        {
17            InitializeComponent();
18        }
19
20        void _data_DataChangedEvent(object sender, MyEventArgs e)
21        {
22            this.textBox1.Text = e.EventTag;
23        }
24
25        public MyData Data
26        {
27            set
28            {
29                this._data = value;
30                this._data.DataChangedEvent += new MyData.DataChanged(_data_DataChangedEvent);
31            }
32        }
33
34        private void button1_Click(object sender, EventArgs e)
35        {
36            this._data.Data = this.textBox1.Text;
37        }
38    }
39}