题目：模拟窗口卖票，四个窗口同时对外开放售票，需要按顺序售出。
要求：输出每一张票的售出时间和售出窗口，不能出现票未售出或者被售出多次的情况。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;
using System.IO;
using System.Reflection;
using System.Diagnostics; namespace SellTicketsSynchronously
{
class Program
{
//入口
static void Main(string[] args)
{
Ticket tc = new Ticket();
Thread sellWindowA = new Thread(new ParameterizedThreadStart(SellTicket));
Thread sellWindowB = new Thread(new ParameterizedThreadStart(SellTicket));
Thread sellWindowC = new Thread(new ParameterizedThreadStart(SellTicket));
Thread sellWindowD = new Thread(new ParameterizedThreadStart(SellTicket));
sellWindowA.Name = "Window A";
sellWindowB.Name = "Window B";
sellWindowC.Name = "Window C";
sellWindowD.Name = "Window D";
sellWindowA.Start(tc);
sellWindowB.Start(tc);
sellWindowC.Start(tc);
sellWindowD.Start(tc);
sellWindowA.Join();
sellWindowB.Join();
sellWindowC.Join();
sellWindowD.Join();
Console.WriteLine("Tickets has been sold out. Press any key to quit:");
Console.ReadLine();
}
//卖票方法
public static void SellTicket(object obj)
{
Ticket ticket = obj as Ticket;
while (ticket.NumOfTickets>)
{
lock (ticket)
{
if (ticket.NumOfTickets > )
{
try
{
ticket.NumOfTickets--;
Console.WriteLine( DateTime.Now.ToString()+":"+Thread.CurrentThread.Name + " sells a ticket, " + ticket.NumOfTickets + " tickets left.");
}
catch (Exception ex)
{
WriteLog(ex);
}
}
}
Random random = new Random();
Thread.Sleep(random.Next(,));
}
}
//打log方法
private static void WriteLog(Exception ex)
{
string logUrl = Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory) + "\\SellTicketslog.txt";
if (File.Exists(@logUrl))
{
using (FileStream fs = new FileStream(logUrl, FileMode.Append))
{
using (StreamWriter sw = new StreamWriter(fs, Encoding.Default))
{
try
{
sw.Write(ex);
}
catch (Exception ex1)
{
WriteLog(ex1);
}
finally
{
sw.Close();
fs.Close();
}
}
}
}
else
{
using (FileStream fs = new FileStream(logUrl, FileMode.CreateNew))
{
using (StreamWriter sw = new StreamWriter(fs, Encoding.Default))
{
try
{
sw.Write(ex);
}
catch (Exception ex1)
{
WriteLog(ex1);
}
finally
{
sw.Close();
fs.Close();
}
}
}
}
}
}
//票类
class Ticket
{
public int NumOfTickets { get; set; }
public Ticket(int num)
{
this.NumOfTickets = num;
}
}
}
运行结果：
不知道这么写会不会有问题，求指点。
————————修改版——————————
经过园友指点，我改用了Task写了这段代码，其间得到了园友的帮助，非常感谢！
修改后的代码如下（蓝色字体为修改的部分）：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;
using System.IO;
using System.Reflection;
using System.Diagnostics; namespace SellTicketsSynchronously
{
class Program
{
//入口
static void Main(string[] args)
{
Ticket tc = new Ticket(10);
WaitForAllSales(tc);
Console.WriteLine("Tickets has been sold out. Press any key to quit:");
Console.ReadLine();
}
//售罄方法
private static void WaitForAllSales(Ticket tc)
{
//创建一个Task类型的泛型list
List<Task> tasks = new List<Task>();
for (int i = 1; i <= 4; i++)
{
//将所有的售票task存入list
tasks.Add(Task.Run(() => { SellTicket(string.Format("Window"+i), tc); }));
}
//等待所有的task都完成
Task.WaitAll(tasks.ToArray());
}
//卖票方法
public static void SellTicket(string windowName, object obj)
{
string nameOfWindow = windowName;
Ticket ticket = obj as Ticket;
while (ticket.NumOfTickets > )
{
lock (ticket)
{
if (ticket.NumOfTickets > )
{
try
{
ticket.NumOfTickets--;
Console.WriteLine(DateTime.Now.ToString() + ":" + nameOfWindow + " sells a ticket, " + ticket.NumOfTickets + " tickets left.");
}
catch (Exception ex)
{
WriteLog(ex);
}
}
}
Random random = new Random();
Thread.Sleep(random.Next(,));
}
}
//打log方法
private static void WriteLog(Exception ex)
{
string logUrl = Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory) + "\\SellTicketslog.txt";
if (File.Exists(@logUrl))
{
using (FileStream fs = new FileStream(logUrl, FileMode.Append))
{
using (StreamWriter sw = new StreamWriter(fs, Encoding.Default))
{
try
{
sw.Write(ex);
}
catch (Exception ex1)
{
WriteLog(ex1);
}
finally
{
sw.Close();
fs.Close();
}
}
}
}
else
{
using (FileStream fs = new FileStream(logUrl, FileMode.CreateNew))
{
using (StreamWriter sw = new StreamWriter(fs, Encoding.Default))
{
try
{
sw.Write(ex);
}
catch (Exception ex1)
{
WriteLog(ex1);
}
finally
{
sw.Close();
fs.Close();
}
}
}
}
}
}
//票类
class Ticket
{
public int NumOfTickets { get; set; }
public Ticket(int num)
{
this.NumOfTickets = num;
}
}
}
运行结果：
欢迎大家发散思维，继续提出宝贵意见！:)
------------------------------------------------------------------------------------------------------------
经过一位朋友细心的发现，上面这个程序逻辑是有问题的，一直都是售票窗口5在售票，修改后的代码如下：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;
using System.IO;
using System.Reflection;
using System.Diagnostics; namespace SellTicketsSynchronously
{
class Program
{
//入口
static void Main(string[] args)
{
Ticket tc = new Ticket(20);
WaitForAllSales(tc);
Console.ReadLine();
}
//售罄方法
private static void WaitForAllSales(Ticket tc)
{
//创建一个Task类型的泛型list
List<Task> tasks = new List<Task>();
System.Random ran = new Random();
while (tc.NumOfTickets > 0)
{
int i = ran.Next(1,6);
//将所有的售票task存入list
tasks.Add(Task.Run(() => { SellTicket(string.Format("Window" + i), tc); }));
Task.WaitAll(tasks.ToArray());
}
Console.WriteLine("Tickets has been sold out. Press any key to quit:");
}
//卖票方法
public static void SellTicket(string windowName, object obj)
{
string nameOfWindow = windowName;
Ticket ticket = obj as Ticket;
lock (ticket)
{
if (ticket.NumOfTickets > )
{
try
{
ticket.NumOfTickets--;
Console.WriteLine(DateTime.Now.ToString() + ":" + nameOfWindow + " sells a ticket, " + ticket.NumOfTickets + " tickets left.");
}
catch (Exception ex)
{
WriteLog(ex);
}
}
Random random = new Random();
Thread.Sleep(random.Next(,));
}
}
//打log方法
private static void WriteLog(Exception ex)
{
string logUrl = Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory) + "\\SellTicketslog.txt";
if (File.Exists(@logUrl))
{
using (FileStream fs = new FileStream(logUrl, FileMode.Append))
{
using (StreamWriter sw = new StreamWriter(fs, Encoding.Default))
{
try
{
sw.Write(ex);
}
catch (Exception ex1)
{
WriteLog(ex1);
}
finally
{
sw.Close();
fs.Close();
}
}
}
}
else
{
using (FileStream fs = new FileStream(logUrl, FileMode.CreateNew))
{
using (StreamWriter sw = new StreamWriter(fs, Encoding.Default))
{
try
{
sw.Write(ex);
}
catch (Exception ex1)
{
WriteLog(ex1);
}
finally
{
sw.Close();
fs.Close();
}
}
}
}
}
}
//票类
class Ticket
{
public int NumOfTickets { get; set; }
public Ticket(int num)
{
this.NumOfTickets = num;
}
}
}
本次修改了售罄方法和入口方法（橙色字体），运行结果如下：
欢迎继续提出意见！谢谢大家~