Calling inheriting class methods via interface

Question

Given the scenario...

interface IBase{ 
  void Process(int value);
}

abstract class Base : IBase
{
 public virtual void Process(int value){ throw new NotImplementedException(); }
}

class Implemented: Base, IBase
{
 public void Process(int value)
 {
   // .. some code here.. 
 }
}

I'm trying to write a loop similar to the following.

foreach( Base b in CollectionOfImplemented )
{
 b.Process( // something will go here // );
}

Trying this, it keeps calling Base.Process, instead of Implemented.Process; but the type in the collection is Implemented, not Base. Boxing it seems to work, but I was hoping to see if I could find a more intelligent approach to it, since the Collection will contain other types of objects that also inherit from Base.

Jordão · Accepted Answer · 2010-05-25 17:28:41Z

9

You need to explicitly override Process in Implemented:

class Implemented: Base 
{ 
  public override void Process(int value) 
  { 
    // .. some code here..  
  } 
}

Or you won't get virtual method dispatching.

Also, if your base method is always going to throw that NotImplementedException, it should be marked as abstract instead.

answered May 25, 2010 at 17:28

Jordão

56.8k13 gold badges118 silver badges147 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Stephen Over a year ago

One of Visual Studio's excellent features is that within the child class, you can start typing the word "override" and Intellisense will show you which virtual methods can be overridden.

Chris · Accepted Answer · 2010-05-25 17:29:34Z

0

I think you need to specify "override" for Process in your Implemented class.

answered May 25, 2010 at 17:29

Chris

2,9912 gold badges34 silver badges48 bronze badges

Collectives™ on Stack Overflow

Calling inheriting class methods via interface

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related