Export (0) Print
Expand All

OrderedDictionary.Keys Property

Gets an ICollection object containing the keys in the OrderedDictionary collection.

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

'Declaration
Public ReadOnly Property Keys As ICollection

Property Value

Type: System.Collections.ICollection
An ICollection object containing the keys in the OrderedDictionary collection.

Implements

IDictionary.Keys

The returned ICollection object is not a static copy; instead, the ICollection refers back to the keys in the original OrderedDictionary collection. Therefore, changes to the OrderedDictionary continue to be reflected in the ICollection.

The following code example demonstrates the creation and population of an OrderedDictionary collection, and then prints the contents to the console. In this example, the Keys and Values properties are passed to a method that displays the contents. This code is part of a larger code example that can be viewed at OrderedDictionary.

' Creates and initializes a OrderedDictionary. 
Dim myOrderedDictionary As New OrderedDictionary()
myOrderedDictionary.Add("testKey1", "testValue1")
myOrderedDictionary.Add("testKey2", "testValue2")
myOrderedDictionary.Add("keyToDelete", "valueToDelete")
myOrderedDictionary.Add("testKey3", "testValue3")

Dim keyCollection As ICollection = myOrderedDictionary.Keys
Dim valueCollection As ICollection = myOrderedDictionary.Values

' Display the contents Imports the key and value collections
DisplayContents( _
    keyCollection, valueCollection, myOrderedDictionary.Count)
' Displays the contents of the OrderedDictionary from its keys and values 
Public Shared Sub DisplayContents( _
    ByVal keyCollection As ICollection, _
    ByVal valueCollection As ICollection, ByVal dictionarySize As Integer)

    Dim myKeys(dictionarySize) As [String]
    Dim myValues(dictionarySize) As [String]
    keyCollection.CopyTo(myKeys, 0)
    valueCollection.CopyTo(myValues, 0)

    ' Displays the contents of the OrderedDictionary
    Console.WriteLine("   INDEX KEY                       VALUE")
    Dim i As Integer 
    For i = 0 To dictionarySize - 1
        Console.WriteLine("   {0,-5} {1,-25} {2}", _
             i, myKeys(i), myValues(i))
    Next i
    Console.WriteLine()
End Sub

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.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.

Show:
© 2014 Microsoft