C#中一道关于多线程的基础练习题——模拟仓库存销过程

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;
using System.IO;

namespace MultiThreadStore
{
    class Program
    {
        //入口
        static void Main(string[] args)
        {
            Goods goods = new Goods();
            Thread storeGoods = new Thread(new ParameterizedThreadStart(store));
            Thread sellGoods = new Thread(new ParameterizedThreadStart(sell));
            storeGoods.Start(goods);
            sellGoods.Start(goods);
            Console.ReadLine();
        }
        //存货方法
        private static void store(object obj)
        {
            bool storeFlag = true;
            Random random = new Random();
            while (storeFlag)
            {
                try
                {
                    Goods goods = obj as Goods;
                    if (goods.Num < goods.MaxNum)
                    {
                        goods.Num++;
                        Console.WriteLine("Store a goods, " + goods.Num + " goods left!");
                    }
                    else 
                    {
                        Console.WriteLine("The store is full now.");
                    }
                    Thread.Sleep(random.Next(500, 1000));
                }
                catch (Exception ex)
                {
                    WriteLog(ex);
                    storeFlag = false;
                }
            }
        }
        //卖货方法
        public static void sell(object obj) 
        {
            bool sellFlag = true;
            Random random = new Random();
            while (sellFlag)
            {
                try
                {
                    Goods goods = obj as Goods;
                    if (goods.Num > 0)
                    {
                        goods.Num--;
                        Console.WriteLine("Sell a goods, " + goods.Num + " goods left!");
                    }
                    else 
                    {
                        Console.WriteLine("There are no goods now.");
                    }
                    Thread.Sleep(random.Next(1000, 4000));
                }
                catch (Exception ex)
                {
                    WriteLog(ex);
                    sellFlag = false;
                }
            }
        }
        //打log方法
        private static void WriteLog(Exception ex)
        {
            string logUrl = Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory) + "\\MuliThreadStorelog.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();
                        }
                    }
                }
            }
        }
    }
    //货品类
    class Goods 
    {
        public int Num { get; set; }
        public int MaxNum { get; set; }
        public Goods() 
        {
            Num = 10;
            MaxNum = 50;
        }     
    }
}