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  lt T gt  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 lt List lt T gt  gt   nor how exactly to pass the  lt T gt  parameter to the inside list   Edit  Adding information  Would declaring a List lt List lt T gt  gt  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 lt T gt                private List lt List lt T gt  gt  data   new List lt List lt T gt  gt              private ulong capacity   0          private const int maxnumberOfItemsPerList   Int32 MaxValue             public DynamicList64                         data   new List lt List lt T gt  gt

User · Answer

A quick example   List lt List lt string gt  gt  myList   new List lt List lt string gt  gt     myList Add new List lt string gt     a    b      myList Add new List lt string gt     c    d    e      myList Add new List lt string gt     qwerty    asdf    zxcv      myList Add new List lt string gt     a    b          To iterate over it  foreach  List lt string gt  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 lt T gt  that has a member that is a  List

User · Answer

you should not use Nested List in List   List lt List lt T gt  gt     is not legal  even if T were a defined type   https   msdn microsoft com en-us library ms182144 aspx

User · Answer

public class ListOfLists lt T gt    List lt List lt T gt  gt        var myList   new ListOfLists lt string gt

User · Answer

I have been toying with this idea too  but I was trying to achieve a slightly different behavior  My idea was to make a list which inherits itself  thus creating a data structure that by nature allows you to embed lists within lists within lists within lists   infinitely   Implementation    InfiniteList lt T gt  is a list of itself    public class InfiniteList lt T gt    List lt InfiniteList lt T gt  gt          This is necessary to allow your lists to store values  of type T       public T Value   set  get        T is a generic type parameter  It is there to ensure type safety in your class   When you create an instance of InfiniteList  you replace T with the type you want your list to be populated with  or in this instance  the type of the Value property   Example    The InfiniteList Value property will be of type string InfiniteList lt string gt  list   new InfiniteList lt string gt       A  working  example of this  where T is in itself  a List of type string     Create an instance of InfiniteList where T is List lt string gt  InfiniteList lt List lt string gt  gt  list   new InfiniteList lt List lt string gt  gt        Add a new instance of InfiniteList lt List lt string gt  gt  to  list  instance  list Add new InfiniteList lt List lt string gt  gt         access the first element of  list   Access the Value property  and add a new string to it  list 0  Value Add  Hello World

User · Answer

or this example  just to make it more visible   public class CustomerListList   List lt CustomerList gt         public class CustomerList   List lt Customer gt       public class Customer      public int ID   get  set       public string SomethingWithText   get  set        and you can keep it going  to the infinity and beyond

[c#] Creating a List of Lists in C#

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