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NameObjectCollectionBase.BaseSet Method (String, Object)

Sets the value of the first entry with the specified key in the NameObjectCollectionBase instance, if found; otherwise, 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 BaseSet ( _
	name As String, _
	value As Object _
)
'Usage
Dim name As String
Dim value As Object

Me.BaseSet(name, value)
protected void BaseSet (
	String name, 
	Object value
)
protected function BaseSet (
	name : String, 
	value : Object
)
Not applicable.

Parameters

name

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

value

The Object that represents the new value of the entry to set. The value can be a null reference (Nothing in Visual Basic).

Exception typeCondition

NotSupportedException

The collection is read-only.

If the collection contains multiple entries with the specified key, this method sets only the first entry. To set the values of subsequent entries with the same key, use the enumerator to iterate through the collection and compare the keys.

This method is an O(1) operation.

The following code example uses BaseSet to set the value of a specific element.

Imports System
Imports System.Collections
Imports System.Collections.Specialized

Public Class MyCollection
   Inherits NameObjectCollectionBase

   ' Gets or sets the value at the specified index.
   Default Public Property Item(index As Integer) As [Object]
      Get
         Return Me.BaseGet(index)
      End Get
      Set
         Me.BaseSet(index, value)
      End Set
   End Property

   ' Gets or sets the value associated with the specified key.
   Default Public Property Item(key As [String]) As [Object]
      Get
         Return Me.BaseGet(key)
      End Get
      Set
         Me.BaseSet(key, value)
      End Set
   End Property

   ' Gets a String array that contains all the keys in the collection.
   Public ReadOnly Property AllKeys() As [String]()
      Get
         Return Me.BaseGetAllKeys()
      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)
      Console.WriteLine("Initial state of the collection:")
      PrintKeysAndValues2(myCol)
      Console.WriteLine()

      ' Sets the value at index 1.
      myCol(1) = "sunflower"
      Console.WriteLine("After setting the value at index 1:")
      PrintKeysAndValues2(myCol)
      Console.WriteLine()

      ' Sets the value associated with the key "red".
      myCol("red") = "tulip"
      Console.WriteLine("After setting the value associated with the key ""red"":")
      PrintKeysAndValues2(myCol)

   End Sub 'Main

   Public Shared Sub PrintKeysAndValues2(myCol As MyCollection)
      Dim s As [String]
      For Each s In  myCol.AllKeys
         Console.WriteLine("{0}, {1}", s, myCol(s))
      Next s
   End Sub 'PrintKeysAndValues2

End Class 'SamplesNameObjectCollectionBase 


'This code produces the following output.
'
'Initial state of the collection:
'red, apple
'yellow, banana
'green, pear
'
'After setting the value at index 1:
'red, apple
'yellow, sunflower
'green, pear
'
'After setting the value associated with the key "red":
'red, tulip
'yellow, sunflower
'green, pear


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

public class MyCollection extends NameObjectCollectionBase
{
    // Gets or sets the value at the specified index.
    /** @property 
     */
    public Object get_Item(int index)
    {
        return this.BaseGet(index) ;
    } //get_Item

    /** @property 
     */
    public void set_Item(int index,Object value )
    {
        this.BaseSet(index, value);
    } //set_Item

    // Gets or sets the value associated with the specified key.
    /** @property 
     */
    public Object get_Item(String key)
    {
        return this.BaseGet(key) ;
    } //get_Item

    /** @property 
     */
    public void set_Item(String key,Object value )
    {
        this.BaseSet(key, value);
    } //set_Item
   
    // Gets a String array that contains all the keys in the collection.
    /** @property 
     */
    public String[] get_AllKeys()
    {
        return this.BaseGetAllKeys() ;
    } //get_AllKeys
   
    // Adds elements from an IDictionary into the new collection.
    public MyCollection(IDictionary d)
    {
        IDictionaryEnumerator objEnum = d.GetEnumerator();

        while (objEnum.MoveNext()) {
            DictionaryEntry 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);

        Console.WriteLine("Initial state of the collection:");
        PrintKeysAndValues2(myCol);
        Console.WriteLine();

        // Sets the value at index 1.
        myCol.set_Item(1, "sunflower");
        Console.WriteLine("After setting the value at index 1:");
        PrintKeysAndValues2(myCol);
        Console.WriteLine();

        // Sets the value associated with the key "red".
        myCol.set_Item("red", "tulip");
        Console.WriteLine("After setting the value associated with the key" 
            + " \"red\":");
        PrintKeysAndValues2(myCol);
    } //main

    public static void PrintKeysAndValues2(MyCollection myCol)
    {
        String str = new String();

        for (int iCtr = 0; iCtr < myCol.get_Count(); iCtr++) {
            str = myCol.get_AllKeys()[iCtr];
            Console.WriteLine("{0} , {1}", str, (myCol.get_Item(str)).ToString());
        }
    } //PrintKeysAndValues2
} //SamplesNameObjectCollectionBase 

/*
This code produces the following output.

Initial state of the collection:
red, apple
yellow, banana
green, pear

After setting the value at index 1:
red, apple
yellow, sunflower
green, pear

After setting the value associated with the key "red":
red, tulip
yellow, sunflower
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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