c#之枚举，结构体

1.枚举

2.结构体

例子1：    
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _038_结构体 {
    //我们可以把结构体当成，几个类型组成了一个新的类型
    //比如下面的这个就是使用了3个float类型的变量，来表示一个坐标类型
    struct Position//position 表示结构体名 
    {
        public float x;
        public float y;
        public float z;
    }

    enum Direction
    {
        West,
        North,
        East,
        South
    }

    struct Path
    {
        public float distance;
        public Direction dir;
    }
    class Program {
        static void Main(string[] args)
        {
            //通过三个float类型的变量来表示一个敌人的坐标
            //float enemy1X = 34;
            //float enemy1Y = 1;
            //float enemy1Z = 34;


            //float enemy2X = 34;
            //float enemy2Y = 1;
            //float enemy2Z = 34;

            //当使用结构体声明变量的时候，相当于使用结构体中所有的变量去声明
            //Position enemy1Position;
            //enemy1Position.x = 34;//可以通过.加上属性名来访问结构体中指定的变量
            ////使用结构体让程序变得更清晰
            //Position enemy2Position;

            Path path1;
            path1.dir = Direction.East;
            path1.distance = 1000;
        }
    }
}


例子2：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _012结构体
{
    public struct Student
    {

        public string _name;            //public 是访问修饰符，访问范围是公共的，一般条件满足别处都可以调用
        public Sex _sex;
        public int _age;

    }
    public enum Sex
    {
        男,
        女

    }
    class Program
    {

        static void Main(string[] args)
        {
            //大学管理系统 来一个就需要录入信息，信息有姓名，性别，年龄。。。。。。
            //string zsName = "张三";
            /ar zsSex = '男';
            //int zsAge = 20;

            //string lsName = "李四";
            /ar lsSex = '女';
            //int lsAge = 25;

            //string wwName = "王五";
            /ar wwSex = '女';
            //int wwAge = 26;
            //学校招了10000人，需要定义30000个变量
            //public struct 结构名{ 字段，属性，方法  }

            Student zsPerson;
            zsPerson._name = "张三";
            zsPerson._sex = Sex.男;
            zsPerson._age = 20;
            Student lsPerson;
            lsPerson._name = "李四";
            lsPerson._sex = Sex.女;
            lsPerson._age = 25;
            Console.WriteLine(lsPerson._age);



        }
    }
}

枚举：代码规范，把同类放在一起
 public enum Sex
    {
        男,//默认代表0
        女=10,
        middle
    }
    class Program
    {

        static void Main(string[] args)
        {
            //大学管理系统：现在招生，文法系招生性别记录男女，机电系性别记录爷们娘们
            //数学系记录1，0  国贸记录boy girl
            //学校下达一个规定，性别只能用男女，其他学院必须调用学校教务处的性别，不能随便自己定义，于是产生了枚举：规范代码，把同类的放在一起
            //public enum 枚举名{ 值，值，值}

            #region 枚举转换Int
               //Sex math = Sex.男;
               //int num = (int)math;
               //Console.WriteLine(num);
            #endregion
            #region int转枚举
            //int num = 11; 
            //Sex s = (Sex)num;//int转换枚举后，如果有对应的枚举，就显示其内容，如果没有就显示源数字
            //Console.WriteLine(s);
            #endregion
            #region String转枚举
            //string str = "middle";
            //Sex o= (Sex)Enum.Parse(typeof(Sex),str);
            //Console.WriteLine(o);
            #endregion
            #region 把枚举转换为字符串
            Sex s = Sex.middle;
            string str = s.ToString();
            Console.WriteLine(s);
            #endregion
        }
    }

例子：
public enum Season
    {


       春, 
　　　　夏,
 　　  秋, 
      冬
    }
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("请输入季节");
            string season = Console.ReadLine();
            Season s;
            switch (season)
            {
                case "春":
                case "夏":
                case "秋":
                case "冬": s = (Season)Enum.Parse(typeof(Season), season); Console.WriteLine(s); break;
                default: Console.WriteLine("您输入的不是季节"); break;
            }

        }
    }

例子：
using System;

namespace _002_student结构
{
    public struct Student
    {
        public long _nums;
        public string _name;
        public Sex _sex;
        public int _grade;
    }
    public enum Sex
    {
        男,
        女
    }
    class Program
    {
        static void Main(string[] args)
        {
            Student person1;
            person1._nums = 154090201026;
            person1._name = "huangwei";
            person1._sex = Sex.男;
            person1._grade = 100;

            Console.WriteLine(person1._name);
            Student person2;
            person2._nums = 154210;
            person2._name = "alin";
            person2._sex = Sex.女;
            person2._grade = 99;
            Console.WriteLine(person2._grade);
        }
    }
}

using System;

namespace _009_枚举
{
    public struct Class
    {
        public int _num;
        public string _name;
        public Sex _sex;
        public int _xuehao; 
    }
    public enum Sex
    {
        男,
        女
    }
    class Program
    {
        static void Main(string[] args)
        {
            Class person1;
            person1._num = 34;
            person1._name="黄伟";
            person1._sex = Sex.男;
            person1._xuehao = 10086;

            Class person2;
            person2._num = 34;
            person2._name = "小明";
            person2._sex = Sex.女;
            person2._xuehao = 55555;

            Console.WriteLine("姓名"+"\t"+"班级人数"+"\t"+"性别"+"\t"+"学号");
            Console.WriteLine(person1._name+"\t"+person1._num+"\t"+"        "+person1._sex+"\t"+person1._xuehao);
        }
    }
}