单例模式小例子

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace WindowsFormsapplication5{    class Class1    {        PRivate static Class1 mInstance;        //线程辅助对象        private static readonly object lockAssistant = new object();        /// <summary>        /// 单例        /// </summary>        /// <returns></returns>        public static Class1 Instance        {            get            {                if (mInstance == null)                {                    lock (lockAssistant)                    {                        if (mInstance == null)                        {                            mInstance = new Class1();                        }                    }                }                return mInstance;            }        }        public int  dd()         {            return 1;        }        public int cc()         {            return 2;        }    }}