NameObjectCollectionBase.BaseAdd Method
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).
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.