NameObjectCollectionBase.BaseAdd Method (String, Object)

.NET Framework (current version)

Adds an entry with the specified key and value into the NameObjectCollectionBase instance.

Namespace: System.Collections.Specialized
Assembly: System (in System.dll)

Syntax

Protected Sub BaseAdd (
	name As String,
	value As Object
)

Parameters

name: Type: System.String
The String key of the entry to add. The key can be null.

value: Type: System.Object
The Object value of the entry to add. The value can be null.

Exceptions

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.

Examples

The following code example uses BaseAdd to create a new NameObjectCollectionBase with elements from an IDictionary.

C++

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 'NewNew

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

Version Information

Universal Windows Platform
Available since 10
.NET Framework
Available since 1.1