.net - Which is more efficient a method returning a Func<bool> or returning bool? -

i refactoring linq queries , trying determine efficient refactor.

the original line query similar to:

  static void main() {      var list = new list<string> { "a", "bb", "ccc" };      var shortlist = list.any(name => name.length == 1);   } 

i can refactor out string length check method follows:

  static void main() {      var list = new list<string> { "a", "bb", "ccc" };      var shortlist = list.any(name => isshort(name));   }    private static bool isshort(string name) {      return name.length == 1;   } 

or, can refactor out complete func method:

  static void main() {      var list = new list<string> { "a", "bb", "ccc" };      var shortlist = list.any(isshortfunc());   }    private static func<string, bool> isshortfunc() {      return name => name.length == 1;   } 

the question is, more efficient @ run time?

actually can better using method group conversion construct delegate:

static void main() {    var list = new list<string> { "a", "bb", "ccc" };    var shortlist = list.any(isshort); }  private static bool isshort(string name) {    return name.length == 1; } 

this have 1 less level of indirection first solution, , it's more readable (imo) second version. if don't have think in higher order functions, don't :)

i'd expect differences in efficiency absolutely miniscule though. should focusing on readability unless have evidence readable solution isn't performing need to.