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SortedDictionary.Keys Property

Gets a collection containing the keys in the SortedDictionary.

Namespace: System.Collections.Generic
Assembly: System (in system.dll)

'Declaration
Public ReadOnly Property Keys As KeyCollection
'Usage
Dim instance As SortedDictionary(Of TKey, TValue)
Dim value As KeyCollection

value = instance.Keys

/** @property */
public KeyCollection get_Keys ()

public function get Keys () : KeyCollection

Not applicable.

Property Value

A SortedDictionary.KeyCollection containing the keys in the SortedDictionary.

The keys in the SortedDictionary.KeyCollection are sorted according to the Comparer property and are in the same order as the associated values in the SortedDictionary.ValueCollection returned by the Values property.

The returned SortedDictionary.KeyCollection is not a static copy; instead, the SortedDictionary.KeyCollection refers back to the keys in the original SortedDictionary. Therefore, changes to the SortedDictionary continue to be reflected in the SortedDictionary.KeyCollection.

Getting the value of this property is an O(1) operation.

The following code example shows how to enumerate the keys in the dictionary using the Keys property, and how to enumerate the keys and values in the dictionary.

This code is part of a larger example that can be compiled and executed. See SortedDictionary.

    ' To get the keys alone, use the Keys property.
    Dim keyColl _
        As SortedDictionary(Of String, String).KeyCollection = _
        openWith.Keys
    
    ' The elements of the KeyCollection are strongly typed
    ' with the type that was specified for dictionary keys.
    Console.WriteLine()
    For Each s As String In keyColl 
        Console.WriteLine("Key = {0}", s)
    Next s

...

    ' When you use foreach to enumerate dictionary elements,
    ' the elements are retrieved as KeyValuePair objects.
    Console.WriteLine()
    For Each kvp As KeyValuePair(Of String, String) In openWith
        Console.WriteLine("Key = {0}, Value = {1}", _
            kvp.Key, kvp.Value)
    Next kvp

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, 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

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