Help me impliment this class structure

[eggie5]

I have a class Category, that derives from the ServiceResource class.

//Base class for all resources
//Lots of these properties must be overridden by the derived class
//Starting to think it makes more sense for this to be an interface instead...
public class ServiceResource
{

    public string endpoint\_url; //this MUST be over ridden by the derived class
    

    //this takes the object and saves it via API call
    public ServiceResponse Save()
    {
        string post\_params = BuildParameters(); //this should call BuildParameters in the derived class

        ServiceRequest request = new ServiceRequest();

        ServiceResponse resp = request.Send("POST", this.endpoint\_url, post\_params);

        return resp;
    }

    public string BuildParameters()
    {
        throw new Exception("You must set this in the derived class");
        //this MUST overridded by descendent class so this class can make the requests to the API endpoint
    }
}

And the Category class:

public class Category : ServiceResource
{
private int id;
private string name;

        public string BuildParameters()
        {

            return "I am overriding base.BuildParameters()";
        }
        
        //Override base.endpoint\_url
        public string endpoint\_url = "/categories";

        public int Id
        {
            get { return id; }
            set { id = value; }
        }

        public string Name
        {
            get { return name; }
            set { name = value; }
        }
    }

Now I would like to be able to use the Category class like this:

Category c = new Category();
c.Name="new category";
c.Save();

Now when Save is called, it will call the method BuildParameters. However, I want it to call BuildParameters in the derived class and not the base class, same with endpoint_url. At this point, base.BuildParameters is called instead. How can I do this.

/\ |_ E X E GG

[kubben]

Try overriding the base class save in the child class and perhaps marking the base class save as abstract. That will force the child classes to override it. Hope that helps. Ben

[Paddy Boyd]

You also haven't marked your inherited method as overrides (although i've spent all day coding in VB.net and may not have that quite right...)