what does that mean? [Baseclass] [name] = new [Subclass]

Question

I actually learn c# and i stuck at this theme:

what does this mean: [Baseclass] [name] = new [Subclass]

i only understand that i can use that as a parameter like

    public void DoSomething(Book _book)
    {
        if (_book is PokemonBook)
        {
            Console.WriteLine("It's a Pokemon-Book!");
        }
        else
        {
            Console.WriteLine("idk");
        }
    }

but i dont understand this [Baseclass] [name] = new [Subclass], when do is use this and what does it do?

and yes, it's a stupid question

you cannot assign BaseClass to the SubClass read more about Polymorphism — kriss, May 29 '20 at 10:03
Are you sure its not [Baseclass] [name] = new [Subclass] (for example `Animal giraffe = new Giraffe()`)? [Subclass] [name] = new [Baseclass] will not compile without an explicit cast. — InBetween, May 29 '20 at 10:03
das verstehe ich, aber nicht das: [Subclass] [name] = new [Baseclass] — Schon wieder am pasten naja, May 29 '20 at 10:04
Does this answer your question? [What is polymorphism, what is it for, and how is it used?](https://stackoverflow.com/questions/1031273/what-is-polymorphism-what-is-it-for-and-how-is-it-used) — Sinatr, May 29 '20 at 10:14

score 2 · Answer 1 · answered May 29 '20 at 10:09

2

You cannot do Subclass x = new BaseClass (even if you cast), But can do BaseClass x = new SubClass

This is essentially treating an instance of subclass as baseclass.

answered May 29 '20 at 10:09

moral

150
1
6

Such treating is called *polymorphism*. – Sinatr May 29 '20 at 10:16
You got it mate... – moral May 29 '20 at 10:24

Ali Zangeneh · Answer 2 · 2020-05-29T14:54:02.433

i think this link can help you to learn all about class

https://learn.microsoft.com/en-us/dotnet/csharp/tutorials/inheritance

and dont ask some question like this other Guys Use negative Point and with negative point you cant ask your Question here... why negative Point ? Bcs you must first try little Improve You Skill then try find you Answer With Search in GooGle or this site then if you are not find your Answer you must Qustion here and try to Read Question Rule

you can learn C# in Microsoft Site Easy ( you can find many Simple Example ) then you can come here and read many many many Code and ask and Answer and you Grow Faster

i hope my answer help you and dont forgot learn about OOP

what does that mean? [Baseclass] [name] = new [Subclass]

2 Answers2