C#中单例模式的三种写法示例

第一种最简单,但没有考虑线程安全,在多线程时可能会出问题,不过俺从没看过出错的现象,表鄙视我……

public class Singleton

{

    private static Singleton _instance = null;

    private Singleton(){}

    public static Singleton CreateInstance()

    {

        if(_instance == null)

        {

            _instance = new Singleton();

        }

        return _instance;

    }

}


第二种考虑了线程安全,不过有点烦,但绝对是正规写法,经典的一叉

public class Singleton

{

    private volatile static Singleton _instance = null;

    private static readonly object lockHelper = new object();

    private Singleton(){}

    public static Singleton CreateInstance()

    {

        if(_instance == null)

        {

            lock(lockHelper)

            {

                if(_instance == null)

                     _instance = new Singleton();

            }

        }

        return _instance;

    }

}


第三种可能是C#这样的高级语言特有的,实在懒得出奇

public class Singleton

{

    private Singleton(){}

    public static readonly Singleton instance = new Singleton();

}


哦,shit!

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