单例模式

  class SingleObject
    {
        private SingleObject() { }//设置构造函数为私有，这样就无法通过外部实例化
        private static SingleObject _singleobject;
        private static readonly object obj = new object();
        public static SingleObject getInstance()
        {
            lock (obj)//如果存在多线程访问，加锁
            {
                if (_singleobject == null)
                {

                    _singleobject = new SingleObject();

                }
                return _singleobject;
            }
        }
    }

  static void Main(string[] args)
        {

            SingleObject.getInstance().Name = "hello Single Pattern";
            Console.WriteLine(SingleObject.getInstance().Name);
            Console.ReadKey();

        }