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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)

Protected Sub BaseSet ( _
	name As String, _
	value As Object _


Type: System.String

The String key of the entry to set. The key can be Nothing.

Type: System.Object

The Object that represents the new value of the entry to set. The value can be Nothing.


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]
         Return Me.BaseGet(index)
      End Get 
         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]
         Return Me.BaseGet(key)
      End Get 
         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]()
         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:")

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

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

   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

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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