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

Definizione

Ottiene una raccolta contenente le chiavi della classe 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

Valore della proprietà

Esempi

Esempio di codice seguente viene illustrato come enumerare le chiavi nel dizionario usando il Keys proprietà e su come enumerare le chiavi e valori nel dizionario.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.

Questo codice è parte di un esempio più grande che può essere compilato ed eseguito (openWith è il nome del dizionario usato in questo esempio).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). Vedere 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

Commenti

L'ordine delle chiavi nel Dictionary<TKey,TValue>.KeyCollection non è specificato, ma è stesso ordine dei valori associati nel Dictionary<TKey,TValue>.ValueCollection restituiti dal Values proprietà.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.

L'oggetto restituito Dictionary<TKey,TValue>.KeyCollection non è una copia statica; in alternativa, il Dictionary<TKey,TValue>.KeyCollection fa riferimento alle chiavi nel originale Dictionary<TKey,TValue>.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>. Di conseguenza, le modifiche apportate al Dictionary<TKey,TValue> continuano a essere riflessi nel Dictionary<TKey,TValue>.KeyCollection.Therefore, changes to the Dictionary<TKey,TValue> continue to be reflected in the Dictionary<TKey,TValue>.KeyCollection.

Ottenere il valore di questa proprietà è un'operazione o (1).Getting the value of this property is an O(1) operation.

Si applica a

Vedi anche