C#通过委托与事件实现父窗体向多个子窗体传数据

C#通过委托与事件实现父窗体向多个子窗体传数据

按照5个步骤实现：
主窗体：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace EventDemo
{
    //【1】声明委托
    public delegate void delegateSendMsg(string msg);
    public partial class FrmMain : Form
    {
        //【2】定义一个事件
        private event delegateSendMsg SendMsgEvent;
        public FrmMain()
        {
            InitializeComponent();

            FrmClient1 objClient1 = new FrmClient1();
            FrmClient2 objClient2 = new FrmClient2();

            //【5】关联事件
            SendMsgEvent += new delegateSendMsg(objClient1.EventResponse);
            SendMsgEvent += new delegateSendMsg(objClient2.EventResponse);

            objClient1.Show();
            objClient2.Show();
        }

        private void bt_Send_Click(object sender, EventArgs e)
        {
            //【3】激发事件
            SendMsgEvent(tb_Msg.Text.Trim());
        }
    }
}

子窗体1：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace EventDemo
{
    public partial class FrmClient1 : Form
    {
        public FrmClient1()
        {
            InitializeComponent();
        }
        //【4】定义事件响应方法
        public void EventResponse(string msg)
        {
            tb_Msg.Text = msg;
        }
    }
}

子窗体2：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace EventDemo
{
    public partial class FrmClient2 : Form
    {
        public FrmClient2()
        {
            InitializeComponent();
        }
        //【4】定义事件响应方法
        public void EventResponse(string msg)
        {
            tb_Msg.Text = msg;
        }
    }
}

运行结果如下：