KeyValuePair<TKey,TValue> Structure

Définition

generic <typename TKey, typename TValue>
public value class KeyValuePair

[System.Serializable]
public struct KeyValuePair<TKey,TValue>

type KeyValuePair<'Key, 'Value> = struct

Public Structure KeyValuePair(Of TKey, TValue)

Paramètres de type

Héritage

Object

ValueType

KeyValuePair<TKey,TValue>

Attributs

SerializableAttribute

Exemples

L’exemple de code suivant montre comment énumérer les clés et les valeurs d’un dictionnaire, à KeyValuePair<TKey,TValue> l’aide de la structure.The following code example shows how to enumerate the keys and values in a dictionary, using the KeyValuePair<TKey,TValue> structure.

Ce code fait partie d’un exemple plus complet fourni pour Dictionary<TKey,TValue> la classe.This code is part of a larger example provided for the Dictionary<TKey,TValue> class.

// 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

La Dictionary<TKey,TValue>.Enumerator.Current propriété retourne une instance de ce type.The Dictionary<TKey,TValue>.Enumerator.Current property returns an instance of this type.

L' foreach instruction de la C# for eachlangue( dans C++retourne un objet du type des éléments dans la collection. For EachThe foreach statement of the C# language (for each in C++, For Each in Visual Basic) returns an object of the type of the elements in the collection. Étant donné que chaque élément d’une collection IDictionary<TKey,TValue> basée sur est une paire clé/valeur, le type d’élément n’est pas le type de la clé ou le type de la valeur.Since each element of a collection based on IDictionary<TKey,TValue> is a key/value pair, the element type is not the type of the key or the type of the value. Au lieu de cela, le KeyValuePair<TKey,TValue>type d’élément est.Instead, the element type is KeyValuePair<TKey,TValue>. Par exemple :For example:

for each(KeyValuePair<String^, String^> kvp in myDictionary)
{
    Console::WriteLine("Key = {0}, Value = {1}", kvp.Key, kvp.Value);
}

foreach( KeyValuePair<string, string> kvp in myDictionary )
{
    Console.WriteLine("Key = {0}, Value = {1}", kvp.Key, kvp.Value);
}

For Each kvp As KeyValuePair(Of String, String) In myDictionary
    Console.WriteLine("Key = {0}, Value = {1}", kvp.Key, kvp.Value)
Next kvp

L' foreach instruction est un wrapper autour de l’énumérateur, qui autorise uniquement la lecture, et non l’écriture, de la collection.The foreach statement is a wrapper around the enumerator, which allows only reading from, not writing to, the collection.

Constructeurs

Propriétés

Méthodes

S’applique à

Voir aussi

• IDictionary<TKey,TValue>
• Dictionary<TKey,TValue>.Enumerator
• DictionaryEntry