Winform利用委托进行窗体间的传值

在form1.cs中

1.委托的定义

//定义一个委托
public delegate void AddUsrEventHandler(object sender, AddUsrEventHandlerArgs e);

2.事件的定义

　　　　 //委托实例
public event AddUsrEventHandler UserAdded;

3.事件的引发

　　　　//按下btn之后触发事件
this.UserAdded(this,new AddUsrEventHandlerArgs(user));

在form2.cs中

1.登记事件

　　　　//登记一个事件
frm.UserAdded += new AddUsr.AddUsrEventHandler(frm_UserAdded);//按两下TAB键会自动生成

2.事件处理

//事件处理函数（回调函数）
void frm_UserAdded(object sender, AddUsr.AddUsrEventHandlerArgs e)
{
//throw new NotImplementedException();

User user = e.Current;

ListViewItem item = new ListViewItem(new  string []{user.UserName,user.PassWorld,user.Memo});
listViewUsr.Items.Add(item);
}

整个demo实现代码为

form1.cs

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 FrmLogin
{
public partial class AddUsr : Form
{
//定义一个委托
public delegate void AddUsrEventHandler(object sender, AddUsrEventHandlerArgs e);

//委托实例
public event AddUsrEventHandler UserAdded;

public AddUsr()
{
InitializeComponent();
}

private void buttonOK_Click(object sender, EventArgs e)
{
if (UserAdded != null)
{
User user =new User();
user.UserName = this.textBoxUsrName.Text.Trim();
user.PassWorld = this.textBoxPaswd.Text;
user.Memo = this.textBoxMemo.Text.Trim();
//按下btn之后触发事件
this.UserAdded(this,new AddUsrEventHandlerArgs(user));
}
}
//传递参数的类型
public  class AddUsrEventHandlerArgs : EventArgs
{
public User Current {set; get;}
public AddUsrEventHandlerArgs(User user)
{
this.Current = user;
}
}

}
}

form2.cs

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 FrmLogin
{
public partial class FrmUsrList : Form
{
public FrmUsrList()
{
InitializeComponent();
}

private void btnAdd_Click(object sender, EventArgs e)
{
AddUsr frm = new AddUsr();
//1.登记一个事件
frm.UserAdded += new AddUsr.AddUsrEventHandler(frm_UserAdded);//按两下TAB键会自动生成

frm.ShowDialog();
}
//2.事件处理函数（回调函数）
void frm_UserAdded(object sender, AddUsr.AddUsrEventHandlerArgs e)
{
//throw new NotImplementedException();

User user = e.Current;

ListViewItem item = new ListViewItem(new  string []{user.UserName,user.PassWorld,user.Memo});
listViewUsr.Items.Add(item);
}

}
}

实现效果

form1.cs form2.cs