Use Delegate result as input in C# 2.0

Question

I have List<T> and I want to find two random name from that List<T> starting with some condition from List using .NET 2.0.

I know its very easy with LINQ but I am stuck with 2.0

I am wondering if I can do something like this

List<foo> list = new List<foo>();
List<foo> newlist = new List<foo>();
Random r = new Random();

list.Add(new foo("1"));
list.Add(new foo("A91"));
list.Add(new foo("A01"));
list.Add(new foo("A71"));
list.Add(new foo("B02"));
list.Add(new foo("B2"));
list.Add(new foo("B03"));
list.Add(new foo("23"));
list.Add(new foo("24"));

string[] searchList = { "A", "B", "C",};

foreach (string name in searchList)
{
   List<foo> templist = list.FindAll(delegate (foo f)
                        {
                             List<foo> templist1 = f.Name.StartsWith(name);
                             {
                                if(templist1.Count>0)
                               {
                                  while (templist.Count != 0)
                                 {
                                    ??.Add(templist1[r.Next(templist1.Count)]);

                                 }
                              retrun ??
                            }
                       }
                       });


 }

Answer 1

Not return, but yield return.

Answer 2

Putting aside that the way I'd personally approach being restricted to .NET 2.0 is by using the 3.5 System.Core dll and copying local (as mentioned by Nick Martyshchenko)...

The actual problem here seems to be that you are not returning the correct type in your anonymous delegate List<T>.FindAll takes a Predicate<T> delegate. Predicate returns a bool.

List<T>.FindAll is NOT like the LINQ where method at all. It is not lazy. That is, it is not an IEnumerable that yields on enumeration. FindAll returns a List<T> (already enumerated).

Maybe I'm not understanding your requirements here, but why not do this:

List<foo> templist = list.FindAll(delegate (foo f)
                    {
                         bool itemStartsWith = f.Name.StartsWith(name);

                         if(itemStartsWith)
                         {
                            return true;
                         }
                         return false;
                    });