《C#高级编程》 读书心得1--核心C# 几点你可能没注意，但很基础的小东西。

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《C#高级编程》 读书心得1--核心C# 几点你可能没注意，但很基础的小东西。

<div class="postbody"><div id="cnblogs_post_body">这是本系列读书心得第一篇。
其实所谓核心C#也就是C#的语法基础，相信大家应该已经非常熟悉了，在这里说一下在书中看到，大家可能平时没有太注意到的。此篇比较基础，也是第一次写读书心得，请勿喷啊。
变量以及其作用域。
     首先声明变量：可以直接用int i; 其实它是声明一个名为i 的System.Int32的一个实例。 像int, long这样的关键字都是指向.NET预定义类型，也就是说用他们声明的变量是他们所指向的.NET预定义类型的一个实例。在.net中一共有15个这样的预定义类型，13个值类型，2个引用类型（object和string）。如int 对应的System.Int32, long对应System.Int64。 就像大学的时候我们C语言的老师一直都说int变量的值范围为-32768~32767，是因为当时的C语言编译环境为16位。 还要强调一点就是string字符串在C#中为引用类型，也就是说一个string变量是存储在托管堆上的，而像int这样的值类型是存储在堆栈上。
    我们在int上按F12跳转到定义就会看到它其实是一个结构体：public struct Int32， 所一它存储在堆栈上，而string的定义是public sealed class String是一个类。
    在定义一个string a后，并没有为其初始化a的值为null，而int a后a默认为0。 再有string a="123" 声明了一个string类型，然后对其再次赋值a="456"，会再次创建一个值为456的实例，而不是修改值为123的实例。int a=9之后int b=a 这样在内存中会生成两个值为9的int结构体实例在堆栈中。还有bool变量只接受true或者false，而不会接受0或者1不会对其隐式类型转换。bool变量的默认值为false。
    关于int对应System.Int32,bool对应System.Boolean等其实都是结构，他们都是继承于System.ValueType, 而System.VauleType又继承与System.Object. 所以他们的实例都可以进行ToString()这样的操作。String就直接继承与System.object。
    关于变量的作用域有这样一个有趣的事，请看下面两段代码
<div class="cnblogs_code"> 1     class Program1 2     { 3         private static void Main(string[] args) 4         { 5             int j = 20; 6             for (int i = 0; i < 10; i++) 7             { 8                 int j = 30; 9                 Console.WriteLine(j + 1);10             }11         }12     }

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Author: Meghjeet SagacitiArticle Tools:The hair derives its nourishment from the rind, the glands around as easily as in the follicle. Hair requires sebum and some extent of moisture. The general concept that applying oil in the chief causes hair increase is still to be proven. The almost significant points to be noted in hair care are cleanliness, scalp hygiene, haircut and tone. Your character of hair is the best circumstance element when it comes to hair care franklin marshall. As you may get noticed, not everyone has the same hair character. Some have thick hair, some have crude hair and others have brittle hair mercurial vapor. Naturally, hair care for each of these varies.
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