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C#使用自定义事件实现子类中需要显示的内容传递到主界面中

程序员文章站 2022-06-10 21:09:55
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摘录的网址:https://www.cnblogs.com/xiii/p/7006901.html

自定义一个类的代码:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace WindowsFormsApplication2
{
    class Class1
    {
        public event EventHandler<MyEventArg> OnInput;

        public void taskStart()
        {
            Task task = new Task(dowork);
            task.Start();
        }
        public void dowork()
        {
            for (int i = 0; ; i++)
            {
                if (i%2==1)
                {
                    OnInput(this, new MyEventArg(i.ToString ()));
                }
                Thread.Sleep(500);
            }
        }       
    }
    public class MyEventArg : EventArgs
    {
        string _msg;
        public MyEventArg (string msg)
        {
            this._msg = msg;
        }
        public string Msg
        {
            get { return String.IsNullOrEmpty(_msg) ? "Not String!" : _msg; }
        }
    }
    
}

主界面的代码:

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 WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        private Class1 cl;
        public Form1()
        {
            InitializeComponent();
            cl = new Class1();
            cl.OnInput += cl_OnInput;//显示事件
        }

        private void button1_Click(object sender, EventArgs e)
        {
            cl.taskStart();
        }

        void cl_OnInput(object sender, MyEventArg e)
        {
            this.Invoke(new EventHandler(delegate { textBox1.Text = e.Msg; }));           
        }


    }
}