asked on

I need to enforce an interface AND have base functionality in C#

I need to force child classes to override certain virtual functions and have a certain amount of functionality in the base class.

Since I need member variables and function bodies, I can not use an abstract class. Therefore I can not use an abstract method. Then, since the best I can do is virtual functions, those can be overridden optionally in the child classes.

What I think need is a pure virtual function. Am I right?

How do I implement this in the base class? I am having trouble using the format I expected to use and have seen on the web:

public virtual void DisplayCancelOpMessage() = 0;

I get a "; expected" error from the compiler.

Thanks for the help,
newbieweb

thanks,
newbieweb

ASKER CERTIFIED SOLUTION

OBonio

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

Avodah

A pure virtual function in c# is as follows:

public abstract void DisplayCancelOpMessage();

How i normally solve your dilemna is having an interface which is implemented by an abstract class then provide a body for the methods or properties i need to implement then declare the others as abstract / pure virtual if you prefer this C++ term.

SOLUTION

Anurag Thakur

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial