CODEWITHSUNDEEP
c#inheritance
who-aditya-nawandar
who-aditya-nawandar

Reputation: 1242

How to call derived class function not present in base class?

This is the code. If I want to call DerivedFunction1() in CallFunction(), how can I do that?

namespace Inheritance_Console
 {

class Base
{

}

class DerivedClass1 : Base
{
    public void DerivedFunction1() // this fucntion is to be called...
    {

    }
}

class DerivedClass2 : Base
{
    public void DerivedFunction2()
    {

    }
}

class Program
{
    static void Main(string[] args)
    {
        Base objBase = new DerivedClass1();

        CallFunction(objBase);
    }

    static void CallFunction(Base objBase)
    {
     //......here  

  objBase. //DerivedFunction1 is not accessible here.

    }
}

}

This is not an actual implementation, its an interview question. I don't know what more details to add. Please ask if you think something else is needed here.

Upvotes: 0

Views: 49

Answers (1)

rory.ap
rory.ap

Reputation: 35318

You need to cast it into a DerivedClass1:

if (objBase is DerivedClass1) ((DerivedClass1) objBase).DerivedFunction1();

Note how I'm checking if it's actually a DerivedClass1 first to avoid the invalid cast exception.

Upvotes: 2

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