[RESOLVED] Inheritance namespace already contains definition error

Hi All,

I'm years out of practice and started to re-learn programming. I thought a fun way to learn inheritance is have the user choose a species and a list of sub-species will appear and so on and so forth.

I had my base and derived class in the same file as my opening form but then it complained I can only have 1 partial class in a file so I split it into a second .cs file. Now I get

Quote:

---

Error The namespace '<global namespace>' already contains a definition for 'kelf'

---

when I try to run the program.

I ran the search and it only found 4 instances of kelf (all listed in the same new Fox.cs file).

Fox.cs

Code:

---


public abstract class kelf
{
    private string name;
    private string species;
    private int gestPeriod;

    public kelf(string species)
    {
        this.species = species;
    }

    ~kelf()
    {

    }

    public string GetSpecies()
    {
        return this.species;
    }

}
public class kelf : Foxes
{
    /*public Fox()
    {

    }
    public void test()
    {
        messagebox(this.species);
    }*/
}

---

form1.cs

Code:

---

using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Inheritance
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if(cmbAnimals.Text == "")
            {
                MessageBox.Show("You must choose a top level species");
            }
            else
            {
                //Animal tiger = new Animal(lblAnimal.Text);
            }

        }

        private void cmbAnimals_SelectedIndexChanged(object sender, EventArgs e)
        {
            switch(cmbAnimals.Text.ToUpper())
            {
                case "CANIDAE": lblAnimal.Text = "FOX chosen";
                    //Fox newFox = new Fox();
                break;
                case "GIRAFFA CAMELOPARDALIS": lblAnimal.Text = "Giraffa camelopardalis";
                break;
                case "PANTHERA TIGRIS": lblAnimal.Text = "Panthera tigris";
                break;
                default: break;
            }
        }

    }

}

---

In the solution Explorer my Fox.cs is a direct sub-node of the solution if that makes any difference.
So it goes

Solution
-Properties
-References
-Form1.cs
--Form1.Designer.cs
--Form1.resx
-Fox.cs
-Program.cs

I tried looking up this error and it says my project has this class name somewhere else but I ran the search and it only found the 4 cases there. I checked syntax for Inheritance and it seemed correct to me. I'm not sure what I did wrong so any suggestions would be great/

Reading the code and observing the ".cs" file extension, I guess that this is C# code, not C++ code written for Microsoft Visual C++.

I've moved the thread into the C# forum.

The problem is simple - you've declared an abstract kelp class and then another kelp class that is derived from a Foxes class. You've simply reversed the order of the derived class declaration.

So instead of

Code:

---

public class kelf : Foxes
{
  ...
}

---

you should have..

Code:

---

public class Foxes : kelf
{
  ...
}

---

Btw, generally the names of classes in C# are declared PascalCased, so the name kelf should be Kelf if you follow the usual convention.

Well originally it was Foxes but I changed the name on the 4 cases to see if it made any difference at some point during my struggles lol.

Thanks so much! So easy and I looked http://msdn.microsoft.com/en-us/libr...ce(VS.90).aspx for so long trying to figure it out and it was staring at me the whole time.

Much, much appreciated!

I meant originally kelf was named Animals. My original reply is awaiting approval but I noticed the mistake after hitting submit.