How do I call a method in derived class?

Question

Lets say I have some inheritance going on; I have a "Base" class and a "Derived" class.

 public Base obj;
 
 ...
 ...
 ...
 
 obj = new Derived();
 obj.SomeMethod(<parameters>);

SomeMethod exists in both classes, but takes different parameters. I want to call the derived SomeMethod for obj.

I'm trying to implement something that uses this and can't get it to work : ( "No overload for method SomeMethod takes 2 arguments". It looks like the method in the derived class can't be seen at all.

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Answer by Waz · Aug 01, 2011 at 07:27 PM

Correct, it cannot be seen since obj is a Base. Just because you know it is a Derived does not allow you to call subclass methods. Binding is static, not dynamic. You must assert your knowledge with a downcast:

 (obj as Derived).SomeMethod(...);

If you do this a lot, I would suggest that obj be private Derived and that the public interface be a getter that returns it as a Base.

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crump3ts · Aug 01, 2011 at 09:23 PM 0

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Thank you! : 3

How do I call a method in derived class?

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