C#•9mo ago

❔ Generics

I want to start off by saying I have no clue what I'm talking about. With that out of the way I have a generic function that I want pass a type into, but I want to store that type in a variable and let it be subject to change. Below is an example in a console application which definitively doesn't work, but it demonstrates how I would want it to work.

Random randomClass = new Random();
List<Type> aList = new List<Type> { new A(), new B(), new C() };
int randomInteger = randomClass.Next(3);
Type type = aList[randomInteger];
typeFunc<type>();
static void typeFunc<T>() where T : A
{
    Console.WriteLine("This worked");
}

public class A
{
    
}
public class B : A
{

}
public class C : A
{

}

Random randomClass = new Random();
List<Type> aList = new List<Type> { new A(), new B(), new C() };
int randomInteger = randomClass.Next(3);
Type type = aList[randomInteger];
typeFunc<type>();
static void typeFunc<T>() where T : A
{
    Console.WriteLine("This worked");
}

public class A
{
    
}
public class B : A
{

}
public class C : A
{

}

How is this done? Thanks

9 Replies

reflectronic•9mo ago

you have to use reflection. it is not easy

DeadlyRemix•9mo ago

ok i'll look into it ty

reflectronic•9mo ago

typeof(X).GetMethod("typeFunc", ...).MakeGenericMethod(aList[randomInteger]).Invoke(thisObject, new[] { parameter1, });

typeof(X).GetMethod("typeFunc", ...).MakeGenericMethod(aList[randomInteger]).Invoke(thisObject, new[] { parameter1, });

DeadlyRemix•9mo ago

thank you i'll try and get to grips with this. also if i make a list like this

List<A> aList = new List<A> { new A(), new B(), new C() };

List<A> aList = new List<A> { new A(), new B(), new C() };

is it automatically casted to A and if so that means I lose infomation on what type it is right? and if so how would I store it instead? sorry for so many questions in one

reflectronic•9mo ago

you do not lose the type information permanently. for example, aList[0] is B would be false, but aList[1] is B would be true

DeadlyRemix•9mo ago

oh ok

reflectronic•9mo ago

you can also do aList[1].GetType() to get typeof(B), which you can do other comparisons with

DeadlyRemix•9mo ago

ok thank you

Accord•9mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ Generics