基础才是重中之重~LazyInitializer.EnsureInitialized对属性实现化的性能优化

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LazyInitializer.EnsureInitialized是frameworks4.0引入的新东西，实现对属性延时初始化的功能，它作用在System.Threading命名空间下，所以，它与多线程有着密切的关系，即当多人同步使用这个方法时，对存储的对象有着某种作用，这是msdn的相关说明：

这个方法可以用于多个执行者初始化Target目录对象。

在多个执行者同时存取这个方法的情况下，可能会建立多个T执行个体，但只有一个执行个体会存储至target。在些类情况下，这个方法将不会放置未储存的对象。如果这类对象必须被放置，则由呼叫端判断未使的对象，然后再对物件进行适当的放置。

对于概念不清楚的同步，没有关系，看下面的例子如完全明白了，呵呵

下面的实例介绍了对属性的两个初始化，并进行比较，延时初始化的好处，即在对象使用时再去初始化它，当一个方法体中，如果一个对象初始化了一次，不要再进行重复的初始化工作。

代码1，展现了性能不好的情况

代码2，展现了优化的情况

代码3，微软为了我们进行了封装，在多线程中表现更好

代码1：

  class TestLazyInitializer1
    {

        public People People
        {
            get
            {

                return new People();

            }
        }

        public void Print1()
        {
            Console.WriteLine(People.Name);
        }
        public void Print2()
        {
            Console.WriteLine(People.Name);
        }

    }

代码2：

 class TestLazyInitializer2
    {
        People _people;
        public People People
        {
            get
            {

                return _people == null
                    ? (_people = new People())
                    : _people;

            }
        }

        public void Print1()
        {
            Console.WriteLine(People.Name);
        }
        public void Print2()
        {
            Console.WriteLine(People.Name);
        }

    }

代码3：

 class TestLazyInitializer
    {
        private People _people;
        /// <summary>
        /// 延时初始化指定属性
        /// </summary>
        public People People
        {
            get
            {
                return LazyInitializer.EnsureInitialized(
                    ref _people, () =>
                    {
                        return new People();
                    });
            }
        }

        public void Print1()
        {
            Console.WriteLine(People.Name);
        }
        public void Print2()
        {
            Console.WriteLine(People.Name);
        }

    }

而它们运行的结果，我们可想而知了，当一个类中多次使用同一个对象时，性能不好的，返回的Name(当前时间)，肯定是不同的，而性能好的，只初始化一次的，返回的Name(当前时间)肯定是一个值，呵呵。

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" 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感谢阅读！

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