Unable to use WithSpecification on Specification<S,R> that is the result of Select

[ryanvade]

If I use Select as in the following specification I am unable to use WithSpecification because the types cannot be inferred.

// Note: this is a very basic example
public sealed class AToBSpec : Specification<A, B>
{
    
	public AToBSpec()
    {
 
		Query.Select(a => new B()
 {}).AsNoTracking();
    
  	}

}

And then attempt to use it as follows

List<B> b = context.A.WithSpecification(new AToBSpec()).ToList();

I receive the following error:

Cannot convert source type 'System.Collections.Generic.List<A>' to target type 'System.Collections.Generic.List<B>

If I include the following additional extension for WithSpecification I can make this work (well it compiles, I have not fully tested this yet). Does it make sense to include an override of WithSpecification that builds on Specification<S,R> so that you can use Select?

public static class DbSetExtensions
{
    
	public static IQueryable<TRSource> WithSpecification<TSource, TRSource>(this IQueryable<TSource> source, Specification<TSource, TRSource> specification, ISpecificationEvaluator? evaluator = null) where TSource : class
    {
        
		evaluator = evaluator ?? SpecificationEvaluator.Default;
        
		return evaluator.GetQuery(source, specification);
   
	}

}

I'm not sure if this is a good solution or if I am just missing something.

[fiseni]

Hey @ryanvade,
Thanks, we'll add this.