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哈哈哈~看代码：）想必单件模式大家都非常熟悉：）

namespace Singleton1
{
    class Program
    {
        static void Main(string[] args)
        {
            for (int i = 0; i < 10; i++)
            {
                Factory.RecordCount();
            }

            Factory.Display();

            global::System.Console.Read();
        }
    }

static class Factory
    {
        private static object objLock = typeof(Factory);
        private static long longCount = 0;public static void RecordCount()
        {
            lock (objLock)
            {
                longCount++;
            }
        }public static void Display()
        {
            lock (objLock)
            {
                global::System.Console.WriteLine(longCount);
            }
        }
    }
}