Task+ConcurrentQueue，看懂队列和多线程的作用

利用队列+多线程提高程序运行的效率，

直接上代码

static void Main(string[] args)
{ 
            // CreateTextNoTask();
            CreateTextHasTask(); 
}
 
        /// <summary>
        /// 没有多线程生成txt  
        /// </summary>
        public static void CreateTextNoTask()
        {
            DateTime beginTime = DateTime.Now;
            Console.WriteLine($"开始时间:{beginTime}");
            int count = 10000;//需要生成的txt数量
            int i = 1;
            int secondSpan = 0;
            while (i <= count)
            {
                using (StreamWriter streamWriter = File.AppendText($@"F:\test\2\txt_{i}_{Guid.NewGuid().ToString()}.txt"))
                {
                    for (int j = 0; j < 1000; j++)
                    {
                        streamWriter.WriteLine($@"{DateTime.Now}");
                    }
                }
                i++;
            }
            DateTime endTime = DateTime.Now;
            TimeSpan ts = endTime - beginTime;  //计算时间差
            secondSpan = (int)ts.TotalSeconds;  //将时间差转换为秒
            Console.WriteLine($"结束时间:{DateTime.Now}");
            Console.WriteLine($"耗时:{secondSpan} 秒！");
            Console.ReadKey();
        }
 
        /// <summary>
        /// 利用多线程生成txt
        /// </summary>
        public static void CreateTextHasTask()
        {
            DateTime beginTime = DateTime.Now;
            Console.WriteLine($"开始时间:{beginTime}");
            int secondSpan = 0;
            int count = 10000;//需要生成的txt数量
            int threadNum = 8; //定义线程数量
            int outItem = 0;
            ConcurrentQueue<int> queues = new ConcurrentQueue<int>();
            for (int q = 1; q <= count; q++)
            {
                queues.Enqueue(q);
            }
            List<Task> tasks = new List<Task>();
            for (int t = 0; t < threadNum; t++)
            {
                //Console.WriteLine($"开启一个新线程t={t}");
                tasks.Add(new Task(() =>
                {
                    while (true)
                    {
                        //业务处理
                        var isExit = queues.TryDequeue(out outItem);
                        //Console.WriteLine($"从队列中取出数据：{outItem}");
                        if (!isExit)
                        {
                            //Console.WriteLine($"----------------------队列中没数据啦----------------------");
                            break;
                        }
                        else
                        {
                            using (StreamWriter streamWriter = File.AppendText($@"F:\test\2\txt_{outItem}_{Guid.NewGuid().ToString()}.txt"))
                            {
                                for (int j = 0; j < 1000; j++)
                                {
                                    streamWriter.WriteLine($@"{DateTime.Now}");
                                }
                            }
                            //Console.WriteLine($"生成txt");
                        }
                    }
                }));
            }
            //Console.WriteLine($"tasks.ForEach(a => a.Start());");
            tasks.ForEach(a => a.Start());
            //Console.WriteLine($"Task.WaitAll(tasks.ToArray());");
            Task.WaitAll(tasks.ToArray());
 
            DateTime endTime = DateTime.Now;
            TimeSpan ts = endTime - beginTime;  //计算时间差
            secondSpan = (int)ts.TotalSeconds;  //将时间差转换为秒
            Console.WriteLine($"结束时间:{DateTime.Now}");
            Console.WriteLine($"耗时:{secondSpan} 秒！");
            Console.ReadKey();
        }