Question

I have a list of Func’s in a class called ValidationMethods. I use these in a Validator class by passing them into Validator.Validate(Func). I was wondering if there is a way to wrap each func so that I can overload Validate to take an IEnumerable and specify a where class to filter based on some enum value.

I am doing this in an effort to make the API more closely follow the open / close principle where the Validator can take in more validation types as the need arises without modification of the validator.

Answer 1

I hope I understand you correctly. You want an enum to filter the funcs:

enum Category {
  F1,
  F2
}

Then a wrapper for each func:

class FWrap<TIn, TOut> //depending on your arities
{
  public Func<TIn, TOut> Fnc {get; set;} 
  public Category Cat {get; set;}

  //some constructor and stuff
}

After that, there shouldn’t be any problem:

IEnumerable<FWrap<t1,t2>> funcs = getFuncs();
validators = funcs.Where(f => f.Cat == Category.F1)

and so on… I hpe thats what you expected.