Solving a specific design question using generics: correct in this case?

Let's say I have an interface IAutoTask and few other classes implementing that interface, RegularTextAnswerTask, SelectAnswerTask, JoinPairsTask etc. Each of these classes defines an EvaluateAnswer method returning an int - but the parameter for the method differs.

public sealed class SelectAnswerTask : IAutoTask
{

    public int EvaluateAnswer(int[] answer);

}

public sealed class RegularTextAnswerTask : IAutoTask
{

    public int EvaluateAnswer(string 开发者_StackOverflow中文版answer);

}

public sealed class JoinPairsTask : IAutoTask
{

    public int EvaluateAnswer(int[,] answer);

}

Now, what should the definition of the interface look like? I came up with:

public interface IAutoTask<AnswerType>
{

    int EvaluateAnswer(AnswerType answer);

}

And modifying the implementors as follows:

public sealed class SelectAnswerTask : IAutoTask<int[]>
{

    public void EvaluateAnswer(int[] answer)
    {

    }

}

etc.

Do you consider this approach to be a correct one?

Your approach is acceptable, although the best design choice also depends on the way you expect the consumers of your class (i.e. those that use _____AnswerTask) to use it.

Naming conventions for Generic Type Parameters suggest a slight modification to your interface definition:

public interface IAutoTask<TAnswer>
{

    int EvaluateAnswer(TAnswer answer);

}