Winform利用委托进行窗体间的传值

时间:2022-10-10 06:57:17

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

Winform利用委托进行窗体间的传值      Winform利用委托进行窗体间的传值