best way to create object

Question

This seems to be very stupid and rudimentary question  but i tried to google it  but couldn t a find a satisfactory answer   public class Person       public string Name   get  set        public int Age   get  set        public Person         public Person string name  int age                Name   name          Age   age              Other properties  methods  events        My question is if i have class like this  what is the best way to create an object   Person p new Person  abc  15    OR   Person p new Person    p Name  abc   p Age 15    What is the difference between these two methods and what is the best way to create objects

User · Answer

If you think less code means more efficient  so using construct function is better  You also can use code like   Person p new Person    Name  abc   Age 15

User · Answer

Really depends on your requirement  although lately I have seen a trend for classes with at least one bare constructor defined   The upside of posting your parameters in via constructor is that you know those values can be relied on after instantiation   The downside is that you ll need to put more work in with any library that expects to be able to create objects with a bare constructor   My personal preference is to go with a bare constructor and set any properties as part of the declaration   Person p new Person        Name    Han Solo      Age   39      This gets around the  class lacks bare constructor  problem  plus reduces maintenance   I can set more things without changing the constructor

User · Answer

Depends on your requirment  but the most effective way to create is    Product obj   new Product                               ID   21                  Price   200                  Category    XY                   Name    SKR

User · Answer

In my humble opinion  this is just a matter of deciding if the arguments are optional or not  If an Person object shouldn t  logically  exist without Name and Age  they should be mandatory in the constructor  If they are optional   i e  their absence is not a threat to the good functioning of the object   use the setters   Here s a quote from Symfony s docs on constructor injection      There are several advantages to using constructor injection          If the dependency is a requirement and the class cannot work without it then injecting it via the constructor ensures it is present when the class is used as the class cannot be constructed without it    The constructor is only ever called once when the object is created  so you can be sure that the dependency will not change during the object s lifetime          These advantages do mean that constructor injection is not suitable for working with optional dependencies  It is also more difficult to use in combination with class hierarchies  if a class uses constructor injection then extending it and overriding the constructor becomes problematic     Symfony is one of the most popular and respected php frameworks

User · Answer

Decide if you need an immutable object or not   If you put public properties in your class  the state of every instance can be changed at every time in your code  So your class could be like this   public class Person       public string Name   get  set        public int Age   get  set        public Person         public Person string name  int age                Name   name          Age   age              Other properties  methods  events        In that case  having a Person string name  int age  constructor is not so useful   The second option is to implement an immutable type  For example   public class Person       public string Name   get  private set        public int Age   get  private set         public Person string name  int age                Name   name          Age   age              Other properties  methods  events        Now you have a constructor that sets the state for the instance  once  at creation time  Note that now setters for properties are private  so you can t change the state after your object is instantiated   A best practice is to define classes as immutable every time if possible  To understand advantages of immutable classes I suggest you read this article

User · Answer

There s not really a best way  Both are quite the same  unless you want to do some additional processing using the parameters passed to the constructor during initialization or if you want to ensure a coherent state just after calling the constructor  If it is the case  prefer the first one   But for readability maintainability reasons  avoid creating constructors with too many parameters   In this case  both will do

User · Answer

Or you can use a data file to put many person objects in to a list or array  You do need to use the System IO for this  And you need a data file which contains all the information about the objects    A method for it would look something like this   static void ReadFile         using StreamWriter writer   new StreamWriter   Data csv                  string line   null          line   reader ReadLine            while null    line   reader ReadLine                                          string   values   line Split                           string name   values 0                       int age   int Parse values 1                              Person person   new Person name  age

[c#] best way to create object

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