关于单例模式的一个小demo，在多线程访问中，为了实例唯一，所以object锁定下。

 

using System;

using System.Collections.Generic;

using System.Text;

class Singleton

{

    private static object lockHelper = new object();

    private static volatile Singleton instance = null;

    private string _myName;

    public string MyName

    {

        get { return _myName; }

        set { _myName = value; }

    }

    private Singleton()

    {

        _myName = "leon";

    }

    public static Singleton GetInstance()

    {

        if (instance == null)

        {

            lock (lockHelper)

            {

                if (instance == null)

                {

                    instance = new Singleton();

                }

            }

        }

        return instance;

    }

}

class Program

{

    static void Main(string[] args)

    {

        Console.WriteLine(Singleton.GetInstance().MyName);

        Console.ReadLine();

    }

}