"Class does not implement interface member" error on class implementing a generic interface

Question

I am getting this error while compiling the code and not able to figure out the exact reason:

Class does not implement interface member

This is my code:

interface IReview<T> where T : Review
{
    IEnumerable<T> Reviews { get; set; }

    void AddReview<T>(T item);  
}

class ReviewCollection : IReview<Review>
{
    IEnumerable<Review> _reviews;

    public IEnumerable<Review> Reviews
    {
        get { return _reviews; }
        set { _reviews = value; }
    }

    public void AddReview(Review item)
    {

    }
}

What is the issue with it?

Patrick Hofman · Accepted Answer · 2015-02-04 07:42:53Z

3

Your definition of AddReview in the interface is wrong. It should read:

void AddReview(T item);

The generic type argument T is already provided by the class, and you don't want to deviate in your method (in this case). You now changed the meaning of T to be a local type parameter, not to use the one available on the class level.

answered Feb 4, 2015 at 7:42

Patrick Hofman

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Comments

Loetn · Accepted Answer · 2015-02-04 07:42:59Z

0

You didn't implement the generic method:

public void AddReview<Review>(Review item)
{    
}

Or you should change the signature of the method in your interface:

void AddReview(T item);

answered Feb 4, 2015 at 7:42

Loetn

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Comments

Quintonn · Accepted Answer · 2015-02-04 07:45:47Z

0

You might have to change this method:

public void AddReview(Review item)

To this:

public void AddReview<Review>(Review item)

answered Feb 4, 2015 at 7:45

Quintonn

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