C#多线程操作控件的两种安全方式（委托方式和BackgroundWorker控件方式）

实现的功能是

1、按button2之后，label2会每100毫秒显示一次数字，数字从0到99。（委托方式实现）

2、按button3之后，模拟耗时操作5秒后label3显示为当前时间。（BackgroundWorker方式实现）

3、在1、2执行的时候，按button1可以将label1的内容改为textbox1的内容。（此处为主线程控制，用于显示多线程未死锁主线程）

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 WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        private delegate void SetState(int x);//代理
        public Form1()
        {
            InitializeComponent();
            Thread.CurrentThread.Name = "Main";//主线程命名
            Console.WriteLine(Thread.CurrentThread.Name);
        }

        private void TempFunction() //中转函数，用来连续多次调用目标函数并模拟延时
        {
            for (int i = 0; i < 100;i++ )
            {
                ThreadFunction(i);
                Thread.Sleep(100);
            }
        }
        private void ThreadFunction(int x) //实际控件操作函数
        {
            if (label2.InvokeRequired) //用委托来操作
            {
                SetState ss = new SetState(ThreadFunction);
                Invoke(ss,new object[]{x});
                Console.WriteLine(Thread.CurrentThread.Name);
            }
            else //普通方式操作
            {
                label2.Text = x.ToString();
                label2.Update();
                Console.WriteLine(Thread.CurrentThread.Name);
            }
            
        }

        private void button1_Click(object sender, EventArgs e) //主线程的按钮操作，用来显示区别所在
        {
            label1.Text = textBox1.Text;
        }

        private void button2_Click(object sender, EventArgs e) //按下按钮后开始多线程操作
        {
            Thread th1 = new Thread(new ThreadStart(TempFunction));
            th1.IsBackground = true;
            th1.Name = "kidfruit";
            th1.Start();
        }

        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e) //使用BackgroundWorker控件
        {
            Thread.Sleep(5000); //模拟操作延时
        }

        private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) //BackgroundWorker耗时操作结束后
        {
            label3.Text = DateTime.Now.ToLongTimeString();
        }

        private void button3_Click(object sender, EventArgs e) //开始BackgroundWorker的耗时操作
        {
            backgroundWorker1.RunWorkerAsync();
        }


    }
}