NameObjectCollectionBase.BaseAdd Method
Adds an entry with the specified key and value into the NameObjectCollectionBase instance.
Assembly: System (in System.dll)
'Declaration Protected Sub BaseAdd ( _ name As String, _ value As Object _ ) 'Usage Dim name As String Dim value As Object Me.BaseAdd(name, value)
Parameters
- name
- Type: System.String
The String key of the entry to add. The key can be Nothing.
- value
- Type: System.Object
The Object value of the entry to add. The value can be Nothing.
| Exception | Condition |
|---|---|
| NotSupportedException | The collection is read-only. |
If Count already equals the capacity, the capacity of the NameObjectCollectionBase is increased by automatically reallocating the internal array, and the existing elements are copied to the new array before the new element is added.
If Count is less than the capacity, this method is an O(1) operation. If the capacity needs to be increased to accommodate the new element, this method becomes an O(n) operation, where n is Count.
The following code example uses BaseAdd to create a new NameObjectCollectionBase with elements from an IDictionary.
Imports System Imports System.Collections Imports System.Collections.Specialized Public Class MyCollection Inherits NameObjectCollectionBase Private _de As New DictionaryEntry() ' Gets a key-and-value pair (DictionaryEntry) using an index. Default Public ReadOnly Property Item(index As Integer) As DictionaryEntry Get _de.Key = Me.BaseGetKey(index) _de.Value = Me.BaseGet(index) Return _de End Get End Property ' Adds elements from an IDictionary into the new collection. Public Sub New(d As IDictionary) Dim de As DictionaryEntry For Each de In d Me.BaseAdd(CType(de.Key, [String]), de.Value) Next de End Sub 'New End Class 'MyCollection Public Class SamplesNameObjectCollectionBase Public Shared Sub Main() ' Creates and initializes a new MyCollection instance. Dim d = New ListDictionary() d.Add("red", "apple") d.Add("yellow", "banana") d.Add("green", "pear") Dim myCol As New MyCollection(d) ' Displays the keys and values of the MyCollection instance. Dim i As Integer For i = 0 To myCol.Count - 1 Console.WriteLine("[{0}] : {1}, {2}", i, myCol(i).Key, myCol(i).Value) Next i End Sub 'Main End Class 'SamplesNameObjectCollectionBase 'This code produces the following output. ' '[0] : red, apple '[1] : yellow, banana '[2] : green, pear
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.