Base class methods not accessible from outside parent class? [duplicate]

This question already has an answer here:

I wanted to code a dependency provider to register my dependencies. I inherit the ServiceCollection class, meaning I should get all the methods in that class, right? Wrong, so it seems.

Ad you can see, I inherit it, register it using the this. keyword, but without that it errors.

this.

public class DependencyProvider : ServiceCollection, IDependencyProvider

public DependencyProvider() : base()

Register();


public void Register()

this.AddSingleton<ICoreContext, CoreContext>();




Calling AddSingleton without this. throws an error saying it can't find the method, while adding this. it works as expected. What if I need access it on an instance of the class?

AddSingleton

this.

this

It also means that if I want to access any of the methods outside of this class, I have to duplicate the method inside the DependencyProvider class, which just isn't very efficient.

Here is the IDependencyProvider interface

IDependencyProvider

public interface IDependencyProvider : IServiceCollection

void Register();



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AddSingleton

ServiceCollection

AddSingleton

ServiceCollection

ServiceCollection

ServiceCollectionServiceExtensions.AddSingleton<ICoreContext, CoreContext>(this);

DependencyProvider

ServiceCollection

1 Answer
1

Like I answered you here, AddSingleton is an extension method on IServiceCollection. That means that if you want to use it inside DependencyProvider you need to either use this.AddSingleton or refer to the method directly ServiceCollectionServiceExtensions.AddSingleton.

AddSingleton

IServiceCollection

DependencyProvider

this.AddSingleton

ServiceCollectionServiceExtensions.AddSingleton

Calling AddSingleton without this. throws an error saying it can't find the method, while adding this. it works as expected. What if I need access it on an instance of the class?

Well, in that case you just use it as you'd expect:

var myProvider = new DependencyProvider();
myProvider.AddSingleton<ICoreContext, CoreContext>();