C#: Implement a abstract property in an interface to implement a child

Question

I couldn't find the answer in the internet so I gonna ask for your help. I have an abstract class:

public abstract class AbstractClass
{
    String Name { get; }        
}

Child Class 1:

public class ApplicationDetailsModel : AbstractClass
{
   // This will implement unique properties
}

And each class that implements IComponent will implement a child of "AbstactClass".

An example implementation:

public class ExampleClass : IComponent
{
    public ApplicationDetailsModel DetailsModel;
}

And an interface

public interface IComponent : IPageViewModel
{
    AbstractClass DetailsModel { get; }
}

This example does not compile because the interface forces to implement

AbstractClass DetailsModel = new ApplicationDetailsModel();

Is there a correct way to force an implementation of a child property of a specific abstract class in an interface?

Nkosi · Accepted Answer · 2018-02-02 15:51:11Z

6

Make your interface generic with a constraint

public interface IComponent<T> : IPageViewModel
    where T : AbstractClass
{
    T DetailsModel {get;}
}

By example:

public class ExampleClass : IComponent<ApplicationDetailsModel>{
{
    public ApplicationDetailsModel DetailsModel { get; private set; }
}

Nkosi

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answered Feb 2, 2018 at 15:48

Dave

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1 Comment

It looks like this is the solution I was looking for. Thanks. I'll try this out and if it works I'll mark this as the accepted answer.