C#关于多线程及线程同步

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Form1.cs

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;using System.Threading;//包含头文件namespace lockExample{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void button1_Click(object sender, EventArgs e)        {            listBox1.Items.Clear();            Thread[] threads = new Thread[10];//使用new关键字在堆里创建对象，其生命期相当于全局变量，但访问的时候与普通变量一样            Account acc = new Account(1000, this);            for (int i = 0; i < 10; i++)            {                Thread t = new Thread(acc.DoTransactions);                t.Name = "线程" + i;                threads[i] = t;            }            for (int i = 0; i < 10; i++)            {                threads[i].Start();            }        }        delegate void AddListBoxItemDelegate(string str);//在类的内部也能声明代理        public void AddListBoxItem(string str)        {            if (listBox1.InvokeRequired)//如果是跨线程访问控件则为true            {                AddListBoxItemDelegate d = AddListBoxItem;//代理                listBox1.Invoke(d, str);//调用代理函数并传递参数            }            else            {                listBox1.Items.Add(str);//不是跨线程访问控件则直接访问该控件            }        }    }}

Account.cs

using System;using System.Collections.Generic;using System.Text;using System.Windows.Forms;using System.Threading;namespace lockExample{    class Account    {        private Object lockedObj = new Object();        int balance;        Random r = new Random();        Form1 form1;        public Account(int initial, Form1 form1)        {            this.form1 = form1;            this.balance = initial;        }        /// <summary>        /// 取款        /// </summary>        /// <param name="amount">取款金额</param>        /// <returns>余额</returns>        private int Withdraw(int amount)        {            if (balance < 0)            {                form1.AddListBoxItem("余额：" + balance + " 已经为负值了，还想取呵！");            }            //将lock (lockedObj)这句注释掉，看看会发生什么情况            lock (lockedObj)            {                if (balance >= amount)                {                    string str = Thread.CurrentThread.Name + "取款---";                    str+= string.Format("取款前余额：{0,-6}取款：{1,-6}", balance, amount);                    balance = balance - amount;                    str += "取款后余额：" + balance;                    form1.AddListBoxItem(str);                    return amount;                }                else                {                    return 0;                }            }        }        /// <summary>自动取款</summary>        public void DoTransactions()//Transaction--事务        {            for (int i = 0; i < 100; i++)            {                Withdraw(r.Next(1, 100));            }        }    }}