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;using System.Threading; //線程操作的類在這個命名空間下.namespace C02多線程{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();            //關閉控件的跨線程訪問檢查             TextBox.CheckForIllegalCrossThreadCalls = false;        }        PRivate void button1_Click(object sender, EventArgs e)        {            int sum = 0;            for (int i = 0; i < 999999999; i++)            {                sum += i;            }            MessageBox.Show("ok");        }        private void button2_Click(object sender, EventArgs e)        {            //創建1個線程對象 并為這個線程對象指定要執行的方法.            Thread thread = new Thread(TestThread);            //設置線程為后臺線程.            thread.IsBackground = true;            //開啟線程            thread.Start();            //線程默認情況下都是前臺線程.            //要所有的前臺線程退出以后 程序才會退出.            //后臺線程 只要所有的前臺線程結束 后臺線程就會立即結束.            //進程里默認的線程我們叫做主線程或者叫做UI線程.             //線程什么時候結束 該線程執行的方法執行完以后  線程就自動退出.            //多個線程訪問同一資源  可能造成不同步的情況. 這個叫做 線程重入.            //th.Abort(); 強行停止線程.            //Thread.Sleep(1000);//將當前線程暫停 單位毫秒            //Thread.CurrentThread;得到當前線程的引用            //線程調用帶參數的方法             //創建1個ParameterizedThreadStart委托對象.為這個委托對象綁定方法.            //將委托對象通過構造函數傳入線程對象            //啟動線程的時候調用Start()的重載 將參數傳入.        }        //準備讓線程去調用.        private void TestThread()        {            int sum = 0;            for (int i = 0; i < 999999999; i++)            {                sum += i;            }            MessageBox.Show("ok");        }        private void CountNunm()        {            //使用lock加鎖  請聯想你上廁所的情況            lock (this)            {                for (int i = 0; i < 10000; i++)                {                    int num = int.Parse(textBox1.Text.Trim());                    num++;                    //Thread.Sleep(500);//將當前線程暫停                   // Thread.CurrentThread.Abort();                    //Thread th = Thread.CurrentThread;                    //th.Abort();                    //if (num == 5000)                    //{                    //    th.Abort();                    //}                    textBox1.Text = num.ToString();                }            }        }        Thread th;        private void button3_Click(object sender, EventArgs e)        {            th = new Thread(CountNunm);            th.Name = "哈哈線程";            th.IsBackground = true;            th.Start();            //Thread th1 = new Thread(CountNunm);            //th1.IsBackground = true;            //th1.Start();        }        private void button4_Click(object sender, EventArgs e)        {            //ThreadStart s = new ThreadStart(CountNunm);             //Thread th = new Thread(CountNunm);             ParameterizedThreadStart s = new ParameterizedThreadStart(TestThreadParsms);            Thread t = new Thread(s);            t.IsBackground = true;            t.Start("你好啊");           }        private void TestThreadParsms(object obj)        {            Console.WriteLine(obj.ToString());        }    }}