Creating a List of Lists in C#

Question

I seem to be having some trouble wrapping my head around the idea of a Generic List of Generic Lists in C#. I think the problem stems form the use of the <T> argument, which I have no prior experience playing with. Could someone provide a short example of declaring a class which is a List, that therein contains another List, but where the type of the object contained therein is not immediately known?

I've been reading through the MS documentation on Generics, and I am not immediately sure if I can declare a List<List<T>>, nor how exactly to pass the <T> parameter to the inside list.

Edit: Adding information

Would declaring a List<List<T>> be considered legal here? In case you are wondering, I am building a class that allows me to use a ulong as the indexer, and (hopefully) steps around the nasty 2GB limit of .Net by maintaining a List of Lists.

public class DynamicList64<T>     {         private List<List<T>> data = new List<List<T>>();          private ulong capacity = 0;         private const int maxnumberOfItemsPerList = Int32.MaxValue;            public DynamicList64()         {             data = new List<List<T>>();         }  

Answer 1

A quick example:

List<List<string>> myList = new List<List<string>>(); myList.Add(new List<string> { "a", "b" }); myList.Add(new List<string> { "c", "d", "e" }); myList.Add(new List<string> { "qwerty", "asdf", "zxcv" }); myList.Add(new List<string> { "a", "b" });  // To iterate over it. foreach (List<string> subList in myList) {     foreach (string item in subList)     {         Console.WriteLine(item);     } } 

Is that what you were looking for? Or are you trying to create a new class that extends List<T> that has a member that is a `List'?