C# 委托例子

2022-09-07 18:52:35

两个子窗口向一个主窗口发送信息

主窗口：

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 WindowsFormsApplication1

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

            Form2 fm2 = new Form2();

            fm2.msgSender = this.Receiver; //[3]将委托对象和方法关联

            fm2.Show();

            Form3 fm3 = new Form3();

            fm3.msgSender = this.Receiver; //[3]将委托对象和方法关联

            fm3.Show();

        }

        //[2]根据委托定义方法完成数据传递

        public void Receiver(string info)

        {

            this.label2.Text = info;

        }

    }

        //[1]声明委托，一般定义在外面

        public delegate void ShowInfo(string param);

}

子窗口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 WindowsFormsApplication1

{

    public partial class Form2 : Form

    {

        public Form2()

        {

            InitializeComponent();

        }

        //创建委托对象

        public ShowInfo msgSender;

        //通过委托传递数据

        private void button1_Click(object sender, EventArgs e)

        {

            msgSender(this.textBox1.Text);

        }

    }

}

子窗口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 WindowsFormsApplication1

{

    public partial class Form3 : Form

    {

        public Form3()

        {

            InitializeComponent();

        }

        //创建委托对象[从到主]

        public ShowInfo msgSender;

        private void button1_Click(object sender, EventArgs e)

        {

            msgSender(this.textBox1.Text);

        }

    }

}

主窗口向两个子窗口发送信息

上代码~~~~~~~~~~

主窗口：

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 WindowsFormsApplication1

{

    public partial class Form1 : Form

    {

        public Action<string> SendMsg { get; set; }

        public Form1()

        {

            InitializeComponent();

            Form2 fm2 = new Form2();

            SendMsg += fm2.Recevier;

            fm2.Show();

            Form3 fm3 = new Form3();

            SendMsg += fm3.Receiver; //[3]将委托对象和方法关联

            fm3.Show();

        }

        private void button1_Click(object sender, EventArgs e)

        {

            if (SendMsg != null)

            {

                SendMsg(this.textBox1.Text);//执行所有注册的委托

            }

        }

    }

}

子窗口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 WindowsFormsApplication1

{

    public partial class Form2 : Form

    {

        public Form2()

        {

            InitializeComponent();

        }

        public void Recevier(string info)

        {

            this.label1.Text = info;

        }

    }

}

子窗口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 WindowsFormsApplication1

{

    public partial class Form3 : Form

    {

        public Form3()

        {

            InitializeComponent();

        }

        public void Receiver(string info)

        {

            this.label1.Text = info;

        }

    }

}

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