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;
        }
    }
}