A .Select() that I believe should work but it doesn't.

using System;
using System.Text.RegularExpressions;
using System.Linq;


namespace test
{
    class Program
    {
        static void Main()
        {
            MatchCollection matchCollection = Regex.Matches("", "");
            matchCollection.Select(n => n); // works
            GroupCollection groupCollection = matchCollection[1].Groups;
            groupCollection.Select(n => n); // Doesn't work
        }
    }
}

'GroupCollection' does not contain a definition for 'Select' and no accessible extension method 'Select' accepting a first argument of type 'GroupCollection' could be found (are you missing a using directive or an assembly reference?)

public class MatchCollection : ICollection<Match>, IEnumerable<Match>, IEnumerable, IList<Match>, IReadOnlyCollection<Match>, IReadOnlyList<Match>, ICollection, IList

public class GroupCollection : ICollection<Group>, IEnumerable<Group>, IEnumerable, IEnumerable<KeyValuePair<string, Group>>, IList<Group>, IReadOnlyCollection<KeyValuePair<string, Group>>, IReadOnlyCollection<Group>, IReadOnlyDictionary<string, Group>, IReadOnlyList<Group>, ICollection, IList