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;
using System.Threading;
 
namespace WindowsFormsApplication3
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        
        public delegate void UpdateTxt(string msg);
        
        public UpdateTxt updateTxt;
 
        
        public void UpdateTxtMethod(string msg)
        {
            richTextBox1.AppendText(msg + "\r\n");
            richTextBox1.ScrollToCaret();
        }
 
        
        public void ThreadMethodTxt(int n)
        {
            this.BeginInvoke(updateTxt, "线程开始执行,执行" + n + "次,每一秒执行一次");
            for (int i = 0; i < n; i++)
            {
                this.BeginInvoke(updateTxt, i.ToString());
                
                Thread.Sleep(1000);
            }
            this.BeginInvoke(updateTxt, "线程结束");
        }
        
        private void button1_Click(object sender, EventArgs e)
        {
            Thread objThread = new Thread(new ThreadStart(delegate
            {
                ThreadMethodTxt(Convert.ToInt32(textBox1.Text.Trim()));
            }));
            objThread.Start();
        }
 
        private void Form1_Load_1(object sender, EventArgs e)
        {
            
            updateTxt = new UpdateTxt(UpdateTxtMethod);
        }
    }
}