C#•13mo ago

✅ List of inherited objects

I know that C# is strongly typed programming language and there are some limitations when it comes to what you can put in lists, but can you create a list of objects where each object is inherited from single class and have same constructor and function?

16 Replies

mtreit•13mo ago

You can create a List that contains whatever you like Not sure what you're asking to be honest.

Anton•13mo ago

Not constructor, but method yes. Look into interfaces For creating objects people often use e.g. a factory delegate or class

arch_il•13mo ago

public class Foo
{
    public virtual void Update() { }

    public virtual void Draw() { }
}


public class InheritedFoo1 : Foo
{
    public override void Update() { }

    public override void Draw() { }
}

public class InheritedFoo2 : Foo
{
    public override void Update() { }

    public override void Draw() { }
}

public class Foo
{
    public virtual void Update() { }

    public virtual void Draw() { }
}


public class InheritedFoo1 : Foo
{
    public override void Update() { }

    public override void Draw() { }
}

public class InheritedFoo2 : Foo
{
    public override void Update() { }

    public override void Draw() { }
}

List<T> foos; where T : Foo

List<T> foos; where T : Foo

Something like this?

mg•13mo ago

It would just be List<Foo>

arch_il•13mo ago

I mean that List contains InheritedFoo1 and InheritedFoo2 inside same list. both of them have same Update() and Draw() functions but with different parameters.

mg•13mo ago

not if they have different parameters then they wouldn't be valid overrides

arch_il•13mo ago

they have same parameters and declarations, but different definitions

mg•13mo ago

that's valid

arch_il•13mo ago

I know, I just need to somehow put 2 classes with same function declarations inside one list

mg•13mo ago

If you declare List<Foo> foos;, you can add objects of any of the three types

arch_il•13mo ago

Really? Do I need any cast or anything? can List<Foo> contain InheritedFoo1 without any fancy shenanigans?

mg•13mo ago

you might have to cast i forget man is there a linqpad equivalent for linux yeah you don't need a cast

SinFluxx•13mo ago

I think List<Foo> is fine for the declaration, it will just be when you're accessing members that you'd need to cast to their concrete type

mg•13mo ago

yeah, which will also involve checking if they are in fact the concrete type you expect them to be which you can do with pattern matching e.g. if (myFoo is InheritedFoo1 inherited1)

arch_il•13mo ago

Thanks for help. I guess not everything needs fancy lines to work

mg•13mo ago

yw how does the bot know 👀

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✅ List of inherited objects