The C # constructor uses

Role: helps us initialize the image (assigning values to each property of the image in turn)

Constructors are a special method

1, the constructor does not return a value, even void can not write

2. The constructor name should be the same as the class name

3. Constructors are executed when creating a pair of images

4. Constructors can be overloaded

There is a constructor (hidden) in the default class, and if you create a constructor, whether it is a parameter or no argument, his default parameterless constructor disappears, and if you need to re-write it without a parameter

Students class

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;usingSystem.Threading.Tasks;namespaceclasslibrary1{ Public classStudents {//create a pair of images using         PublicStudents (stringNameintAgeCharGenderintEnglist,intChinese,intmath) {             This. Name =name;  This. Age =Age ;  This. Gender =gender;  This. Englist =englist;  This. Chinese =Chinese;  This. Math =Math; }         PublicStudents (stringNameintAge ) {             This. Name =name;  This. Age =Age ; }        Private string_name;  Public stringName {Get{return_name;} Set{_name =value;} }        Private int_age;  Public intAge {Get{return_age;} Set            {                if(Value <0|| Value > -) {Value=0; } _age=value; }        }        Private Char_gender;  Public CharGender {Get {                if(_gender! ='male'&& _gender! ='female') {_gender='male'; }                return_gender; }            Set{_gender =value;} }        Private int_chinese;  Public intChinese {Get{return_chinese;} Set{_chinese =value;} }        Private int_math;  Public intMath {Get{return_math;} Set{_math =value;} }        Private int_english;  Public intEnglist {Get{return_english;} Set{_english =value;} }         Public voidSayHello () {Console.WriteLine ("My name is {0}, I am {1} sex, I am {2} years old this year", This. Name, This. Gender, This.        Age); }         Public voidShowscore () {Console.WriteLine ("My name is { 0}, my total score is {1}, my average result is {2}", This. Name, This. Chinese + This. Math + This. Englist, ( This. Chinese + This. Math + This. Englist)/3); }    }}

Program Class

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;usingSystem.Threading.Tasks;namespaceclasslibrary1{ Public Static classProgram { Public Static voidMain (string[] args) {Students ZS=NewStudents ("Zhang San", +,'male', -, A, -); Zs.           SayHello (); Zs.           Showscore (); Students ls=NewStudents ("John Doe", -,'female', the, the, +); Ls.           SayHello (); Ls.            Showscore ();        Console.readkey (); }    }}

The C # constructor uses