C#

UCLAdam wrote:

Am I approaching this right with an abstract base class or should I be taking a different approach?

UCLAdam wrote:

But I also just want to be able to call _profiles.CurrentProfile.Rename(...).

namespace bla 
{
    abstract class DuckBase
    {
        abstract public void Rename();
    }
    class RubberDuck: DuckBase
    {
        // implementation 1
        override public void Rename()
        {
            Console.WriteLine("Squeek");
        }
    }
    class MallardDuck : DuckBase
    {
        // implementation 2
        public override void Rename()
        {
            Console.WriteLine("Quack");
        }
    }

    class Program
    {
        // These are the type of ducks we support. You could also use a string or 
        //  an int to identify them, just choose an enum for this example
        enum KindaDuck { RubberDuck, MallardDuck };

        // this is what's called a factory-method; it returns an actual implementation 
        //  of a "DuckBase"-object
        DuckBase DuckFactory(KindaDuck DuckType)
        {
            switch (DuckType)
            {
                case KindaDuck.MallardDuck: return new MallardDuck();
                case KindaDuck.RubberDuck: return new RubberDuck();
            }
            throw new IndexOutOfRangeException(DuckType.ToString() + " is not a known duck.");
        }

        static void Main(string[] args)
        {
            DuckBase ducky = new RubberDuck();
            ducky.Rename();
            Console.ReadKey(); 
        } 
    }
}

Bastard Programmer from Hell
if you can't read my code, try converting it here[^]

UCLAdam wrote:

Thanks Eddy, your reply really helped.

UCLAdam wrote:

I thought it would probably have to be a strategy-pattern to decide which derived class gets instantiated.

I know it must be intentional, but just checking that in your example the DuckFactory isn't actually being used?

static void Main(string[] args)
{
    // here the enum determines which object is created; you could program the same
    //  with a string. (Say, DuckFactory("MallardDuck"))
    DuckBase ducky = DuckFactory(KindaDuck.MallardDuck);
    ducky.Rename();
    Console.ReadKey();
}

Bastard Programmer from Hell
if you can't read my code, try converting it here[^]

Jun Du wrote:

Any info or suggestions?

--edit
Another downvote for the collection. Was it that really that annoying that I did not check? Here's[^] your article - you're welcome

Bastard Programmer from Hell
if you can't read my code, try converting it here[^]

Member 8461599 wrote:

It should be in a try block?

Bastard Programmer from Hell
if you can't read my code, try converting it here[^]

try
 {
     ...
 }
 catch (Exception e)
 {
 }

Bernhard Hiller wrote:

You are not able to catch them here,

alexalexalex1907 wrote:

can you help me to code this?

Bastard Programmer from Hell
if you can't read my code, try converting it here[^]