IEnumerable doesn't have a Count method

Question

I have the following method:

public bool IsValid
{
  get { return (GetRuleViolations().Count() == 0); }
}

public IEnumerable GetRuleVio         


        

Answer 1

IEnumeration does not have a method called Count(). It's just a kind of "sequence of elements". Use for example List if you explicitly need the number of elements. If you use Linq keep in mind, that the extension method Count() may actually re-count the number of elements each time you call it.