属性的运用和理解

1：属性快捷方式

//输入：prop，回车键，TAB键public int MyProperty { get; set; }

 //输入：propfull，回车键，TAB键
private int myVar;public int MyProperty{get { return myVar; }set { myVar = value; }}

2：定义属性（）

namespace ConsoleApp2
{class student{public string name { get; set; }private int age;public int Age{get { return age; }set { age = value; }}}
}

3：打开反汇编工具，将生成的exe文件拖入即可

4：含义： 

 5：断点调试属性是如何赋值的(1)

namespace ConsoleApp2
{class student{private int age=0;public int Age{get { return age; }set { age = value; }} }
}

class Program{static void Main(string[] args){student student = new student();student.Age = 10;}}
}

a:

 b:

c: 

d:

6: 断点调试属性是如何赋值的(2)

namespace ConsoleApp2
{class student{int age = 10;public int Age { get; set; } = 30;}
}

namespace ConsoleApp2
{class Program{static void Main(string[] args){student student = new student();student.Age = 10;}}
}

a:

b: 

c:

 

6:属性扩展方法

a:增加业务判度逻辑

namespace ConsoleApp2
{class student{private int age;public int Age{get { return age; }set {if (age<0){age = 1;}else{age = value;}               }}}
}

 b:设置只读字段功能（无私有字段）

namespace ConsoleApp2
{class student{//无私有字段，外界读取数据的入口public int Age{get {int result = 2;//此处的值可以是别的地方获取来的return result;}           }}
}

7:属性的初始化

namespace ConsoleApp2
{class student{public int Age { get; set; } = 10;public string  Name { get;  } = "苏苏";public DateTime time{get { return DateTime.Now; }}public DateTime time2 { get => DateTime.Now; }public DateTime time3=> DateTime.Now;}
}

8：构造方法和对象初始化顺序（先初始化字段和显示赋值的属性，原因：如果字段没有初始化，属性和私有字段在构造方法中无法调用），再构造方法

9：对象初始化器和构造方法对比 

对象初始化器：只能初始化属性

namespace ConsoleApp2
{class Program{static void Main(string[] args){student student = new student{Age = 10,MyProperty=1} ;}}
}

构造方法：初始化成员变量，属性，调用方法等

namespace ConsoleApp2
{class student{public student(){}public student(string name){this.name = name;}public student(string name,int age):this(name){this.age = age;}private string name = "苏苏";private int age=20;public int Age{get { return age; }set { age = value; }}public int MyProperty { get; set; } = 20;}
}