关于Singleton设计模式的计数器代码实例(拷贝粘贴即可学习)

Counter.cs:
    class Counter
    {
        //存储唯一的实例
        static Counter uniCounter = new Counter();
        //存储计数值。
        private int totNum = 0;
       
        //用private访问修饰符是防止用new关键字来实例化本类
        private Counter()
        {
            //这里假设因为某种因素而耽搁了100毫秒
            Thread.Sleep(100);
        }

        static public Counter instance()
        {
            return uniCounter;
        }

        //计数加1
        public void Inc()
        {
            totNum ++;
        }
 
        //获得当前计数值
        public int GetCounter()
        {
            return totNum;
        }
    }

Couter的客户端程序：
class MutileClient
    {
        public MutileClient()
        {
        }

        public void DoSomeWork()
        {
            Counter myCounter = Counter.instance();
            for (int i = 1; i < 5; i++)
            {
                myCounter.Inc();
                Console.WriteLine("线程{0}报告: 当前counter为: {1}", Thread.CurrentThread.Name.ToString(), myCounter.GetCounter().ToString());
            }
        }
        public void ClientMain()
        {
            Thread thread0 = Thread.CurrentThread;
            thread0.Name = "Thread 0";
            Thread thread1 = new Thread(new ThreadStart(this.DoSomeWork));
            thread1.Name = "Thread 1";
            Thread thread2 = new Thread(new ThreadStart(this.DoSomeWork));
            thread2.Name = "Thread 2";
            Thread thread3 = new Thread(new ThreadStart(this.DoSomeWork));
            thread3.Name = "Thread 3";
            thread1.Start();
            thread2.Start();
            thread3.Start();
            //线程0也只执行和其他线程相同的工作。
            DoSomeWork();
        }

    }

测试类：
class App
    {
        public static void Main()
        {
            //测试有关Singleton方面的Counter
            MutileClient myClient = new MutileClient();
            myClient.ClientMain();
            System.Console.ReadLine();
        }
    }