Question

I have following interfaces

public interface IReport<TInput, TOutput>
{
    List<TOutput> GenerateReport(TInput input); 
}


public interface IReport<TOutput>
{
    List<TOutput> GenerateReport();
}

But now I want to have following interface

public interface IReport<TInput, TOutput>
{
    TOutput GenerateReport(TInput input); 
}

Is it possible to have like this ?

Thanks

Answer 1

No, that’s not possible because you already have an IReport<TInput, TOutput> interface defined. And you can’t move the TOutput GenerateReport(TInput input); to the first interface because it already provides a method with the same name and same input arguments. The output arguments are not taken into account when doing overloading method resolution.

But given the output arguments of your method I would simply use more meaningful names:

public interface IReport<TInput, TOutput>
{
    List<TOutput> GenerateReports(TInput input);
    TOutput GenerateReport(TInput input);
}