memoization

gistfile1.cs

public static class Memoization {
  public static Func<T,K> MemoizeFunction<T, K>(this Func<T, K> function) {
    var table = new Dictionary<T, K>();
      return (args) => {
        if (table.ContainsKey(args)) return table[args];
        var result = function(args);
        table[args] = result;
        return result;
      }; 
   }
}