using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace china.sichuan.deyang.Singleton
{
    /// <summary>
    /// 推荐的单例模式实现类
    /// </summary>
    public class Singleton
    {
        private static Singleton singleton = new Singleton();

        /// <summary>
        /// 构造函数，限制产生多个对象
        /// </summary>
        private Singleton()
        {
            //// 这句是提示信息
            Console.WriteLine("调用Singleton的构造函数");
        }

        /// <summary>
        /// 通过该方法获得实例对象
        /// </summary>
        /// <returns></returns>
        public static Singleton GetInstance()
        {
            return singleton;
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace china.sichuan.deyang.Singleton
{
    class Program
    {
        static void Main(string[] args)
        {
             
            Singleton singleton1 = Singleton.GetInstance();
            Singleton singleton2 = Singleton.GetInstance();
            Console.WriteLine(singleton1 == singleton2 ? "singleton1与singleton2是同一个对象" : "singleton1与singleton2不是同一个对象");
            Console.Read();
        }
    }
}