KeyValuePair<TKey,TValue> 構造体

定義

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

public struct KeyValuePair<TKey,TValue>

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

type KeyValuePair<'Key, 'Value> = struct

[<System.Serializable>]
type KeyValuePair<'Key, 'Value> = struct

Public Structure KeyValuePair(Of TKey, TValue)

型パラメーター

継承

Object

ValueType

KeyValuePair<TKey,TValue>

属性

SerializableAttribute

例

次のコード例は、構造体を使用して、ディクショナリ内のキーと値を列挙する方法を示して KeyValuePair<TKey,TValue> います。The following code example shows how to enumerate the keys and values in a dictionary, using the KeyValuePair<TKey,TValue> structure.

このコードは、クラスに用意されている大規模な例の一部です Dictionary<TKey,TValue> 。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

注釈

プロパティは、 Dictionary<TKey,TValue>.Enumerator.Current この型のインスタンスを返します。The Dictionary<TKey,TValue>.Enumerator.Current property returns an instance of this type.

foreachC# 言語のステートメント ( for each C++ では For Each Visual Basic) は、コレクション内の要素の型のオブジェクトを返します。The 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. に基づくコレクションの各要素 IDictionary<TKey,TValue> はキーと値のペアであるため、要素の型はキーの型でも、値の型でもありません。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. 代わりに、要素の型は KeyValuePair<TKey,TValue> です。Instead, the element type is KeyValuePair<TKey,TValue>. 次に例を示します。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

foreachステートメントは、列挙子のラッパーであり、コレクションへの書き込みではなく読み取りのみを許可します。The foreach statement is a wrapper around the enumerator, which allows only reading from, not writing to, the collection.

コンストラクター

プロパティ

メソッド

適用対象

こちらもご覧ください

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