Generic Collections In vb.net 2005 Help

Generic Collections In vb.net 2005 Help

• Ejan

  First Of all Thanks for your reply.
  There is hardly any info whatsoever in the matter on vb.net .All in c# and things sometimes are done differently.
  
  To make sure I understand
  If I Inherit from Collection (of t) then I don't have to worry about implementing IEnumerable. Correct I dont even have to have a method like "GetEnumerator"
  So when do you have to implement the IEnumerator in the List one
  
  if i want to enhance the collection I could do:
  
  =========
  Imports system.Collection.ObjectModel
  
  Public Class MyCollectionBase(0f t)
     inherits Collection(0f t)
  
    ''//no need of implementing IEnumerable.For each taken care of already.
  
    end class
  ============
  
  Would I ask too much if you could provide an example of a collection you use that implements some additional functionalities like  Sorting,Filtering ,find etc .
  Cannot find examples and it's driving me mad.
  
  
  
  Thanks again for your reply.
  
  
  
  

• XBTester

  Thanks a lot for your help .
  You have clarified lots of doubts I had.
  
  I wish there was more info on vb.net 2005 especially on generics and what you can do with it.
  
  
  
  Thanks again
  
  

• eajam

  System.Collections.CollectionBase is similar to System.Collections.ObjectModel.Collection(Of T)
  
  and
  
  System.Collections.ArrayList is similar to System.Collections.Generic.List(Of T).
  
  You probably want to use the Collection(Of T) class. The different between that and CollectionBase, is that Collection(Of T) class allows you provide your own storage for the collection in the constructor, whereas the CollectionBase always uses an ArrayList.
  
  It is easy to inherit the Collection(Of T):
  
  

  Public Class MyObjectCollection
     Inherits Collection(Of MyObject)
  
  End Class

  Then to use:
  
  

  Dim collection As New MyObjectCollection()
  
  Collection(Of T) already does the hard work for you and implements IList(Of T), ICollection(Of T), IEnumerable(Of T), IList, ICollection and IEnumerable.

  
  
  

• Ilya Lehrman

  You don't have implement IEnumerable as Collection(Of T) already does it. And you don't need a class that IEnumerator as Collection(Of T) already worries about that.
  
  That's not saying that you can't implement those methods again if you want different implementations than the default, its just means that Collection(Of T) already does quite a lot.
  
  To implement sorting is easy, do the following:
  
  Public Class MyObjectCollection
      Inherits Collection<MyObject>
      
      Public ReadOnly Property InnerList As List<MyObject>
          Get
              Return CType(List,List<MyObject>
          End Get
      End Property
      
      Public Sub Sort(ByVal comparer As IComparer)
          InnerList.Sort(comparer)
      End Sub
      
      Public Class MyObjectCollection
      End Class
  End Class
  
  

• Jeffrey Litch

  If those two posts answered your questions, can you click the 'mark as correct answer' so that other users will be helped by them.
  
  Update: whoops, just noticed that you had already done that for the first one.

  
  
  
• Generic Collections In vb.net 2005 Help