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NameObjectCollectionBase.BaseAdd Method

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

Namespace: System.Collections.Specialized
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)
protected void BaseAdd (
	String name, 
	Object value
)
protected function BaseAdd (
	name : String, 
	value : Object
)
Not applicable.

Parameters

name

The String key of the entry to add. The key can be a null reference (Nothing in Visual Basic).

value

The Object value of the entry to add. The value can be a null reference (Nothing in Visual Basic).

Exception typeCondition

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


import System.* ;
import System.Collections.* ;
import System.Collections.Specialized.* ;

public class MyCollection extends NameObjectCollectionBase
{   
    private DictionaryEntry _de =  new DictionaryEntry();

    // Gets a key-and-value pair (DictionaryEntry) using an index.
    /** @property 
     */
    public DictionaryEntry get_Item(int index)
    {
        _de.set_Key(this.BaseGetKey(index));
        _de.set_Value(this.BaseGet(index));
        return _de ;
    } //get_Item

    // Adds elements from an IDictionary into the new collection.
    public MyCollection(IDictionary d) 
    {
        IEnumerator objEnum = d.GetEnumerator();
        DictionaryEntry de;

        while (objEnum.MoveNext()) {
            de = (DictionaryEntry)(objEnum.get_Current());
            this.BaseAdd(((String)(de.get_Key())), de.get_Value());
        } 
            
    } //MyCollection
} //MyCollection

public class SamplesNameObjectCollectionBase
{
    public static void main(String[] args)
    {
        // Creates and initializes a new MyCollection instance.
        IDictionary d = new ListDictionary();
        d.Add("red", "apple");
        d.Add("yellow", "banana");
        d.Add("green", "pear");
        MyCollection myCol =  new MyCollection(d);
        
        // Displays the keys and values of the MyCollection instance.
        for (int i=0; i < myCol.get_Count(); i++) {
            Console.WriteLine("[{0}] : {1}, {2}", System.Convert.ToString(i),
                myCol.get_Item( i).get_Key(), myCol.get_Item( i).get_Value());
        } 
    } //main 
} //SamplesNameObjectCollectionBase

/*
This code produces the following output.

[0] : red, apple
[1] : yellow, banana
[2] : green, pear

*/

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0
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