c# - How to specify a list selection method? -

i've got method computes list. @ points in algorithm single element list needs chosen. doesn't matter element chosen, i'd leave user decide.

right now, i've added extension method ilist<t>.random() takes random element. .first() have worked equally well. supposing want let user pick method used, or perhaps entirely different method, how look?

i thinking using enum limited options, , wrap each of these calls in switch , call appropriate function. but maybe some sort of lambda function more appropriate?

this method needs used in 2 different places, once on list<char> , once on list<string>. want use same method both.

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this isn't gui app. i'm trying decide how design api.

specifically, want have field like

public func<ilist<t>, t> selectelement = list => list.first(); 

which used in method,

 public string reverse(string pattern, ilist<object> args = null, idictionary<string, object> kwargs = null) 

but generic fields aren't possible. i'm looking alternative solution. 1 make selectelement method argument reverse(), make generic... hoping keep @ class-level re-usability. don't want pass more args function if can it.

edit: full source code

how this:

     public class myclass     {         public static class c<t>         {             public static func<ilist<t>, t> selectelement;         }          public int test(ilist<int> list)         {             return c<int>.selectelement(list);         }     }      static class program     {         static void main(string[] args)         {             myclass.c<char>.selectelement = xs => xs.first();             myclass.c<int>.selectelement = xs => xs.first();              var list = new list<int>(new int[] { 1, 2, 3 });              var c = new myclass();              var v = c.test(list);             console.writeline(v);         }     }