Inheritage with multiple abstract classes

[TMattC]

I´ve got a question regarding inheritage with multible abstract classes. Say I´ve got these classes:

public abstract class Animal
{
public abstract void MyMethod;
}

public abstract class Mammal : Animal
{
public abstract void MyMethod;
}

public class Dog : Mammal
{
public override void MyMethod()
{...}
}

Animal and Mammal are both abstract. Now I dont want the method MyMethod() implemented in Mammal, but I want it implemented in Dog. How can I do? I know the code above doesnt compile.

[TMattC]

Ahem, just found the answer by myself. I leave the method out altogether in the Mammal class.

[BillWoodruff]

Try this:

namespace YourNameSpace
{
public abstract class Animal
{
public string Name;

    public abstract string MyAbstractMethod();

    public virtual string MyVirtualMethod()
    {
        return string.Format("Animal: {0}", Name);
    }
}

public class Mammal : Animal
{
    public override string MyAbstractMethod()
    {
        return string.Format("Mammal: {0}", Name);
    }

    public new string MyVirtualMethod()
    {
        return string.Format("Mammal: {0}", Name);
    }
}

public class Dog : Mammal
{
    public new string MyAbstractMethod()
    {
        return string.Format("Dog: {0}", Name);
    }

    public new string MyVirtualMethod()
    {
        return string.Format("Dog: {0}", Name);
    }
}

}

Test it like this:

namespace YourNameSpace
{
private void TestAnimal()
{
Dog myDog = new Dog();
myDog.Name = "Spot";

    string dname = myDog.MyAbstractMethod();

    string mname = (myDog as Mammal).MyAbstractMethod();

    string aname = (myDog as Animal).MyAbstractMethod();

    string dname2 = myDog.MyVirtualMethod();

    string mname2 = (myDog as Mammal).MyVirtualMethod();

    string aname2 = (myDog as Animal).MyVirtualMethod();
    **// set a break-point here and observe variable values:
    // repeat until 'understanding' happens :)**
}

}

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