Working with System.Type and new

Suppose I have these classes:

class MyBaseClass { ... }
class DerivedClass1 : MyBaseClass { ... };
class DerivedClass2 : MyBaseClass { ... };

And I have a function like this:

ArrayList GetAllInDatabaseLike(MyBaseClass template);

that you can pass an instance of one of the derived classes, and it will fill the array list filled with new objects of DerivedClass1 or DerivedClass2.

I.e., if you say

GetAllInDatabaseLike(new DerivedClass1); it will return an array list full of new DerivedClass1 objects filled with data from the database,

and if you say

GetAllInDatabaseLike(new DerivedClass2); it will return an array list full of new DerivedClass2 objects filled with data from the database.

How do I ensure that it is able to create objects of the correct derived (not base!) class?

Can I say something like:

ArrayList[2] = new typeof(template);

Or do I have to do something via System.Type?
CDFA_IncAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

NipNFriar_TuckCommented:
What you would have to do is something like...

ArrayList[2] = Activator.CreateInstance( template.GetType() );

HTH
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
C#

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.