Why is my inherited class not hiding my base class method?

Question

I have a project which uses Autofac to instantiate the objects

builder.RegisterType<AbcWebWorkContext>().As<IWorkContext>().InstancePerHttpRequest();

This AbcWebWorkContext is a subclass of WebWorkContext :

public partial class AbcWebWorkContext : WebWorkContext

In my AbcWebWorkContext I would like to hide a method and a property from the parent class

protected new Customer GetCurrentCustomer(){ //do stuff }
new public Customer CurrentCustomer { //do studd }

But when someone calls

_workContext.CurrentCustomer

The base class property is called. If I call it like this

((AbcWebWorkContext) _workContext).CurrentCustomer

it works.

I would like to know why I am not able to hide the parent method. I can't change the called class because it is in NopCommerce 's core, which I would not like to change.

Why is it not hiding the method?

Base class declaration of the methods:

protected Customer GetCurrentCustomer() { // do stuff }
public Customer CurrentCustomer{ // do stuff }

calling GetType() on _workcontext will output

{Name = "AbcWebWorkContext" FullName = "Nop.Web.Framework.AbcWebWorkContext"}

The type hierarchy is IWorkContext (interface) « WebWorkContext « AbcWebWorkContext

_workContext is declared as IWorkContext and Autofac generates an instance as AbcWebWorkContext (as shown above)

Answer 1

The new keyword means that the subclass's method hides the baseclass's CurrentCustomer instead of overriding, so WebWorkContext.CurrentCustomer is a completely different method than AbcWebWorkContext.CurrentCustomer .

You must declare the base class's method as

virtual Customer CurrentCustomer { ... }

And the subclass's method

override Customer CurrentCustomer { ... }

I suggest you read more about polymorphism in c# .

If the methods you're using are actually defined in an interface, IWebWorkContext , you simply encapsulate the base class rather than inheriting from it, like this:

class AbcWebWorkContext : IWebWorkContext
{
    private WebWorkerContext _inner = new WebWorkerContext();

    public Customer CurrentCustomer { ... }
}

If you can't make the base class's method virtual, you have to do something much less elegant, like reflection:

var prop = _workContext.GetType().GetProperty("CurrentCustomer");
var value = (Customer)prop.GetValue(_workContext, new object[0]);

Answer 2

I'm not sure if I got your questions right, but I think you need to add a virtual modifier to the method in base class and add a override modifier to method in the subclass.

Find out more on MSDN