Visual Basic 2005 in a Nutshell, Third Edition

Collection.Count Property | 201

The Language

Reference

This is the Title of the Book, eMatter Edition

Copyright © 2006 O’Reilly & Associates, Inc. All rights reserved.

Usage at a Glance

• If you do not specify a before or after value, the member is appended to the end

of the collection (in index order).

• If you do not specify a

key value, you will only be able to access the item by posi-

tion or by iteration using the

For Each...Next statement.

• The before or after argument can refer to an index or a key. For instance,

consider the following code:

Dim someNames As New Collection( )

someNames.Add("Donna", "111")

someNames.Add("Steve", "222")

someNames.Add("Bill", "333", "222")

MsgBox(someNames.Item(2))

This code adds “Bill” just before “Steve.” The following statement could also be

used to achieve the same ordering of items.

someNames.Add("Bill", "333", 2)

• Key values must be unique, or an error occurs.

• You can use named parameters to add items.

unitedStates.Add(Key:="MT", Item:="Montana")

Version Differences

Visual Basic 2005 adds support for generics to several collection-style classes. Generics

are discussed in Chapter 10.

See Also

Collection Class, Collection.Count Property, Collection.Item Property, Collection.

Remove Method

Collection.Count Property

Class

Microsoft.VisualBasic.Collection

Syntax

Dim result As Integer = objectVariable.Count

objectVariable (required; Collection)

The instance of a

Collection ...