Dictionary<TKey,TValue>.Keys Dictionary<TKey,TValue>.Keys Dictionary<TKey,TValue>.Keys Dictionary<TKey,TValue>.Keys Property

Définition

Obtient une collection contenant les clés dans Dictionary<TKey,TValue>.Gets a collection containing the keys in the Dictionary<TKey,TValue>.

public:
 property System::Collections::Generic::Dictionary<TKey, TValue>::KeyCollection ^ Keys { System::Collections::Generic::Dictionary<TKey, TValue>::KeyCollection ^ get(); };
public System.Collections.Generic.Dictionary<TKey,TValue>.KeyCollection Keys { get; }
member this.Keys : System.Collections.Generic.Dictionary<'Key, 'Value>.KeyCollection
Public ReadOnly Property Keys As Dictionary(Of TKey, TValue).KeyCollection

Valeur de propriété

Exemples

L’exemple de code suivant montre comment énumérer les clés dans le dictionnaire à l' Keys aide de la propriété, et comment énumérer les clés et les valeurs dans le dictionnaire.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.

Ce code fait partie d’un exemple plus complet qui peut être compilé et exécutéopenWith (est le nom du dictionnaire utilisé dans cet exemple).This code is part of a larger example that can be compiled and executed (openWith is the name of the Dictionary used in this example). Consultez Dictionary<TKey,TValue>.See Dictionary<TKey,TValue>.

// To get the keys alone, use the Keys property.
Dictionary<String^, String^>::KeyCollection^ keyColl =
    openWith->Keys;

// The elements of the KeyCollection are strongly typed
// with the type that was specified for dictionary keys.
Console::WriteLine();
for each( String^ s in keyColl )
{
    Console::WriteLine("Key = {0}", s);
}
// To get the keys alone, use the Keys property.
Dictionary<string, string>.KeyCollection keyColl =
    openWith.Keys;

// The elements of the KeyCollection are strongly typed
// with the type that was specified for dictionary keys.
Console.WriteLine();
foreach( string s in keyColl )
{
    Console.WriteLine("Key = {0}", s);
}
' To get the keys alone, use the Keys property.
Dim keyColl As _
    Dictionary(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( KeyValuePair<String^, String^> kvp in openWith )
{
    Console::WriteLine("Key = {0}, Value = {1}",
        kvp.Key, kvp.Value);
}
// When you use foreach to enumerate dictionary elements,
// the elements are retrieved as KeyValuePair objects.
Console.WriteLine();
foreach( KeyValuePair<string, string> kvp in openWith )
{
    Console.WriteLine("Key = {0}, Value = {1}", 
        kvp.Key, kvp.Value);
}
' 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

Remarques

L’ordre des clés dans le Dictionary<TKey,TValue>.KeyCollection n’est pas spécifié, mais il s’agit du même ordre que les valeurs associées dans le Dictionary<TKey,TValue>.ValueCollection retourné par Values la propriété.The order of the keys in the Dictionary<TKey,TValue>.KeyCollection is unspecified, but it is the same order as the associated values in the Dictionary<TKey,TValue>.ValueCollection returned by the Values property.

Le retourné Dictionary<TKey,TValue>.KeyCollection n’est pas une copie statique; à la Dictionary<TKey,TValue>.KeyCollection place, fait référence aux clés dans le Dictionary<TKey,TValue>d’origine.The returned Dictionary<TKey,TValue>.KeyCollection is not a static copy; instead, the Dictionary<TKey,TValue>.KeyCollection refers back to the keys in the original Dictionary<TKey,TValue>. Par conséquent, les modifications Dictionary<TKey,TValue> apportées à continuent à Dictionary<TKey,TValue>.KeyCollectionêtre reflétées dans le.Therefore, changes to the Dictionary<TKey,TValue> continue to be reflected in the Dictionary<TKey,TValue>.KeyCollection.

L’obtention de la valeur de cette propriété est une opération O (1).Getting the value of this property is an O(1) operation.

S’applique à

Voir aussi