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Enumerations and structures in C ＃

2022-04-22 07:50:00 【Dream back to Datang knock code】

enumeration :

1. Enumeration

use enum Keyword modification , Add enumeration name

enum Enum name

{

value 1,

value 2,

value 3,

````

}

2. When to use enumerations

Use enumeration when determining the number and value of values , Development of standardized procedures

3. Enumeration assignment

Enum name Variable name = Enum name . value ;

Day nowDay = Day. Monday ;

Structure :

Declaration of a structure use struct Keyword modification , Add structure name

The use of structures :

Different types of data can be stored in the structure , Generally, the structure is used when each individual has some attributes in common

struct Student

{

Variable type Variable name ;

}

Methods in structures :

Methods in structures

<1> If the method is static, you cannot use non static attributes in the structure

<2> If the method is non static, you can make the static and non static attributes in the structure

<3> Calling a static method requires " Structure name . Method name " To call , Non static methods call directly with variable names

<4> Calling a static property requires " Structure name . Property name " To call , Non static attributes call directly with variable names

Code example

using System;

using System.Reflection;

namespace Chapter 10 enumeration and structure

{

#region enumeration

// Enumeration use enum Keyword modification , Add enumeration name

// The default stored in the enumeration type is int Type of , And the following value is always the previous value plus one ;

enum Day : int // The enumeration name can be followed by a limit , But the type of restriction can only be plastic int ,long ,short etc. ;

{

Monday =0,

Tuesday =1, // The value in the enumeration can be changed by an equal sign

Wednesday ,

Thursday ,

Friday ,

Saturday ,

Sunday

}

#endregion

#region Structure

// Declaration of a structure use struct Keyword modification , Add structure name

// Different types of data can be stored in the structure , It's usually

struct Student

{

public string name;

public Xingb xingbie; // Structs can be used with enumerations

public int age;

public string banji;

public bool youden;

}

enum Xingb

{

male ,

Woman

}

#endregion

class Program

{

#region Methods in structures

// Define a structure

struct Teacher

{

public static string name;

public int age;

// Non static methods can use static properties

public void Jieshao()

{

Console.WriteLine( " Hello , I am a :"+name+ " I this year "+age);

}

// Non static properties cannot be used in static methods

public static void Kecheng()

{

Console.WriteLine( " I'll teach you Chinese "+name);

}

#endregion

static void Main( string[] args)

{

#region enumeration

// Xiao Fei often travels , But every time I go out, I'm always tangled about the date ,

// Use enumeration to help Xiaofei randomly choose the day to travel

Random _ran = new Random();

// Because enumeration starts from 0 Start , Followed by the preceding number plus 1, So the value is 0 To 7, But does not include 7.

int _numDay = _ran.Next(0,7);

#region Enumeration and int Conversion of types

Day nowDay = Day. Monday ;

// Enumeration types can be converted to int type

int num = ( int)nowDay;

// Because the enumeration type is integer by default , And the first value is from 0 Start , So Monday turns into int The type value is 0

Console.WriteLine(num);

//int Convert to enumeration type ( Here we use random numbers to determine Xiaofei's travel time )

Day _nowDay1 = (Day)_numDay; //int When converting enumeration, pay attention to whether the value in enumeration exists

// Print Xiaofei's travel time

Console.WriteLine(_nowDay1 );

#endregion

#region Enumeration type and string Conversion between types

// Convert enumeration to string

Day strDay = Day. Wednesday ;

// Enumeration can use .ToString(); Method

string _strDay1 = strDay.ToString();

Console.WriteLine(_strDay1);

// take string Type is converted to enumeration

// Here we use the random number above , First convert the random number into string, Easy to learn string Convert to enumeration

string _strDay2 = _numDay.ToString();

//string There was a Parse Method can string Convert to enumeration

// This method requires two parameters , One is the type , One is string Variable of type

// We need to get this enumeration type Use here typeof( type ) Method to get the enumeration type

// The following code just converts the type to enumeration , But we need to convert to Day Type used

// So I added a strong turn

Day str3NowDay = (Day)Enum.Parse( typeof(Day),_strDay2);

// The string in the above code can be the string value in the enumeration Such as " Monday ", If the string is a numeric value , There is no... In the enumeration

// The numerical value will not report an error , But if it is " Monday " This type of value , If there is no in the enumeration, an exception will be reported

// The printed result is the same as above

Console.WriteLine(str3NowDay);

#endregion

#region Structure

// To use a structure, first declare a structure type

Student stu1;

// Assign a value to the structure , The variable in the assignment structure outside the structure must be Public( Open ) Embellished

stu1.name = " Zhang San ";

stu1.age = 16;

stu1.xingbie = Xingb. male ;

stu1.banji = " Class 1, grade 6 ";

stu1.youden = false;