关于函数:其他类成员构造函数属性索引器析构函数

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讲了底层实现，咱们持续讲语法。

从语法的角度，当运行 new Student()生成对象的时候，实际上是调用了 Student 类中的

构造函数（constructor）

构造函数是在类中，和类名雷同的、像办法一样能够带参数，但没有返回的，用于创立类的实例的……飞哥，等等，你等等，你说的这玩意儿在哪里呢？我在 Student 类里看不到啊！

Good question！带着脑子听课，才是正确的姿态。

实际上，如果一个类没有显式的申明任何构造函数，默认就自带一个无参的无内容的构造函数。所以你看不到，然而飞哥能够把它写进去给你瞅一眼：

internal class Student {// 无参构造函数 public /没有返回 / Student(/ 能够有参数/) // 和类同名 {// 像办法一样，也能够有内容} }

咱们挨着讲，首先，想一想，为什么构造函数没有返回？如果办法没有返回值，还要给个 void，构造函数是咋回事？其实构造函数是有返回值的，它必然返回以后类的一个实例（对象）！这是不可更改的铁律，所以，C# 在语法设计的时候就罗唆省略之，既节俭了代码输出，有能够和办法进行辨别，赞一个！^_^

接下来，既然能够有参数，有能够有内容，咱们加上试试：

class Student {public Student(string name) // 有参构造函数 {Console.WriteLine($” 你好！{name}同学，源栈欢送你……”); } }

构造函数有参数了，调用的时候就得给参数：

Student ywq = new Student(“ 于维谦 ”);

演示：

同时你会发现再也不能应用 new Student()调用无参的构造函数了。这是因为：一旦申明了任何构造函数，之前默认自带的无参构造函数隐没。

如果你还想保留无参构造函数，须要在类中显式申明。即一个类中能够有多个参数不同的构造函数，如下所示：

internal class Student {public Student() {} public Student(string name){} public Student(string name, int age){}}

调用的时候，按办法重载规定进行匹配。

演示：

给构造函数传参干嘛呢？它通常用于给字段赋值，就像这样：

private string name; public Student(string name) {this.name = name; // 增加 this 辨别字段 name 和参数 name}

这里要先说一下：同一个类中的所有同类（动态 / 实例）成员之间都能够相互拜访，动态和实例之间拜访后文会讲。

另外因为构造函数的参数 name 和字段 name 重名了，所以咱们须要在字段 name 后面显式的加上一个 this.，通知编译器：这是以后对象的 name。在类中应用实例成员，实际上都隐式的自带了一个 this.，除非这种呈现混同的情景，个别都能够省略。

留神：this 是只读（readonly）的、不能赋值的。不要混同 this.name= 和 this=

另外，还有一种很罕用的做法，也能够防止这种混同：对立给 private 字段增加一个下划线（_），这也是接下来咱们教材将应用的命名标准。

this 还能够用于构造函数的复制，咱们先看代码：

public Student(string name) {this.name = name; // 代码行 1} public Student(string name, int age) {this.name = name; // 代码行 2 this.age = age;}

代码行 1 和代码行 2 有些反复，是不是？所以咱们能够这样写：

public Student(string name) // 构造函数 1 {this.name = name;} public Student(string name, int age) : this(name) // 应用 this()调用构造函数 1 { this.age = age;}

这样，当运行 Student(name, age)之前，会首先运行 Student(name)，这在构造函数外部的逻辑简单，代码量大的时候尤其有用。

演示：

留神字段 name 的 private 修饰符，同学们有没有想过，它都 private 了，怎么给它赋值呢？哈哈，利用构造函数赋值就是一种罕用的形式。

再想一想，为什么不间接在字段申明时间接赋值呢？

有时候咱们会感觉拜访修饰符还是有些毛糙，理论开发中，咱们会有这样的需要：只是让字段不能被批改，然而能够被读取。这就须要通过这两个修饰符来实现了：

只读（readonly）和常量（const）

他们都是只能读不能改的：

internal readonly string at = “ 源栈 ”; internal const string BELONG = “ 源栈 ”; // 倡议 const 名称全大写 internal readonly string name; //internal const string BELONG; // 报错 internal readonly Teacher fg = new Teacher(); //internal const Teacher xy = new Teacher(); // 报错 public Student(string name) {this.name = name;}

然而，留神他们的语法区别：

  • const 一旦申明，就要赋值；readonly 可用延后到 constructor
  • const 只能是 int/bool/string 等根本类型；readonly 能够是其余类型（如 Teacher）
  • const 默认 static，由类名间接调用；readonly 默认是实例成员，由对象调用

    Console.WriteLine(Student.BELONG); Console.WriteLine(new Student().name);

此外，const 还可用于办法体内润饰变量，readonly 不行。

语法背地，const 是在编译时实现赋值，而 readonly 是在运行时赋值。

演示：

internal class Teacher {public Teacher() {int[] arr = new int[5]; arr[10] = 10; // 运行时谬误 } } // 配合：internal readonly Teacher fg = new Teacher(); // 编译通过，运行时报错

如果咱们须要对字段的读写进行更简单的管制，比方：

  • 学生的 age 不能大于 100，不能小于 0
  • 学生的姓名主动加上（源栈）后缀

怎么办？这就须要：

属性（Property）

属性实质上是一种办法。比方，下面的需要首先能够通过办法实现：

private int _age; internal void setAge(int age) {// 对传入的 age 值进行验证 if (age < 0 || age > 100) {Console.WriteLine(“ 给 age 的赋值超过了 ”); return; } _age = age; // 最终还是利用字段存储 } internal int getAge() { return _age; // 返回字段_age 的值}

咱们能够看到，最终存储数据的还是字段_age，但因为它是公有的，所以内部无奈间接获取，只能通过 setAge()和 getAge()办法进行赋值和取值。而咱们就在办法体中实现任何咱们想要实现的逻辑。

所以，咱们又说属性（这里还只有办法）是对字段的封装。

因为封装字段如此罕用，以致于造成了一种常规：类的字段都应该是公有的，必须进行封装。在其余面向对象的语言（比方 Java）中，就是间接应用如上文所示的办法进行封装（但被专门称之为 getter 和 setter）。但 C# 一开始就专门定义了属性，如下所示：

private int _age; // 依然须要字段_age public int Age // 通常和字段同名，但首字母大写 {get { return _age;} // 当须要获取属性值的时候，返回字段_age 的值 set {_age = value;} // 当给属性赋值的时候，将值寄存到_age 中 }

而后，就能够像应用字段一样应用属性（尽管属性实质上是办法）：

Student zjq = new Student(); zjq.Age = 25; // 赋值，运行属性中的 set{} Console.WriteLine(zjq.Age); // 取值，运行属性中的 get{}

所以咱们常常说，办法是对象的行为（动作），属性是对象的状态（数据）。

要在属性中实现上述 age 赋值时的过滤要求，只须要在 Age 属性的 set{}中增加代码即可：

set {if (value < 0 || value > 100) // 用 value 代表付给属性的值 {Console.WriteLine(“ 给 age 的赋值超过了正当范畴 ”); return; // 完结赋值过程 } _age = value; }

如果要在属性中为取值增加逻辑，只须要在 get 中增加代码：

private string _name; public string Name {get { return _name + “(源栈)”; } set {_name = value;} }https://github.com/hdfgfgh546…
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