DictionaryEntry 構造体

定義

設定または取得できる、ディクショナリのキー/値ペアを定義します。Defines a dictionary key/value pair that can be set or retrieved.

public value class DictionaryEntry
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public struct DictionaryEntry
type DictionaryEntry = struct
Public Structure DictionaryEntry
継承
DictionaryEntry
属性

次の例は、 DictionaryEntryを使用してオブジェクトをHashtable反復処理する方法を示しています。The following example demonstrates the use of DictionaryEntry to iterate through a Hashtable object.

// A simple example for the DictionaryEntry structure.
using namespace System;
using namespace System::Collections;

public ref class Example
{
public:
    static void Main()
    {
        // Create a new hash table.
        //
        Hashtable^ openWith = gcnew Hashtable();

        // Add some elements to the hash table. There are no
        // duplicate keys, but some of the values are duplicates.
        openWith->Add("txt", "notepad.exe");
        openWith->Add("bmp", "paint.exe");
        openWith->Add("dib", "paint.exe");
        openWith->Add("rtf", "wordpad.exe");

        // When you use foreach to enumerate hash table elements,
        // the elements are retrieved as DictionaryEntry objects.
        Console::WriteLine();
        for each (DictionaryEntry de in openWith)
        {
            Console::WriteLine("Key = {0}, Value = {1}", de.Key, de.Value);
        }
    }
};

int main()
{
    Example::Main();
}

/* This code example produces output similar to the following:

Key = rtf, Value = wordpad.exe
Key = txt, Value = notepad.exe
Key = dib, Value = paint.exe
Key = bmp, Value = paint.exe
 */
// A simple example for the DictionaryEntry structure.
using System;
using System.Collections;

class Example
{
    public static void Main()
    {
        // Create a new hash table.
        //
        Hashtable openWith = new Hashtable();

        // Add some elements to the hash table. There are no 
        // duplicate keys, but some of the values are duplicates.
        openWith.Add("txt", "notepad.exe");
        openWith.Add("bmp", "paint.exe");
        openWith.Add("dib", "paint.exe");
        openWith.Add("rtf", "wordpad.exe");

        // When you use foreach to enumerate hash table elements,
        // the elements are retrieved as DictionaryEntry objects.
        Console.WriteLine();
        foreach (DictionaryEntry de in openWith)
        {
            Console.WriteLine("Key = {0}, Value = {1}", de.Key, de.Value);
        }
    }
}

/* This code example produces output similar to the following:

Key = rtf, Value = wordpad.exe
Key = txt, Value = notepad.exe
Key = dib, Value = paint.exe
Key = bmp, Value = paint.exe
 */
'A simple example for the DictionaryEntry structure.
Imports System.Collections

Module Example

    Sub Main()

        ' Create a new hash table.
        '
        Dim openWith As New Hashtable()

        ' Add some elements to the hash table. There are no
        ' duplicate keys, but some of the values are duplicates.
        openWith.Add("txt", "notepad.exe")
        openWith.Add("bmp", "paint.exe")
        openWith.Add("dib", "paint.exe")
        openWith.Add("rtf", "wordpad.exe")

        ' When you use For Each to enumerate hash table elements,
        ' the elements are retrieved as DictionaryEntry objects.
        Console.WriteLine()
        For Each de As DictionaryEntry In openWith
            Console.WriteLine("Key = {0}, Value = {1}", _
                de.Key, de.Value)
        Next de

    End Sub

End Module

' This code example produces output similar to the following:
'
'Key = rtf, Value = wordpad.exe
'Key = txt, Value = notepad.exe
'Key = dib, Value = paint.exe
'Key = bmp, Value = paint.exe

注釈

メソッドIDictionaryEnumerator.Entryは、この型のインスタンスを返します。The IDictionaryEnumerator.Entry method returns an instance of this type.

重要

新しい開発にはDictionaryEntry構造を使用しないことをお勧めします。We don't recommend that you use the DictionaryEntry structure for new development. 代わりに、ジェネリックKeyValuePair<TKey,TValue>構造体をDictionary<TKey,TValue>クラスと共に使用することをお勧めします。Instead, we recommend that you use a generic KeyValuePair<TKey,TValue> structure along with the Dictionary<TKey,TValue> class. 詳細については、「GitHub で非ジェネリックコレクションを使用することはできません。」を参照してください。For more information, see Non-generic collections shouldn't be used on GitHub.

C# Foreachステートメントと各ステートメントのVisual Basic には、コレクション内の各要素の型が必要です。The C# foreach statement and the Visual Basic For Each statement require the type of each element in the collection. の各要素IDictionary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 the IDictionary 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DictionaryEntryです。Instead, the element type is DictionaryEntry. 次に例を示します。For example:

for each (DictionaryEntry de in openWith)
{
    Console::WriteLine("Key = {0}, Value = {1}", de.Key, de.Value);
}
foreach (DictionaryEntry de in openWith)
{
    Console.WriteLine("Key = {0}, Value = {1}", de.Key, de.Value);
}
For Each de As DictionaryEntry In openWith
    Console.WriteLine("Key = {0}, Value = {1}", _
        de.Key, de.Value)
Next de

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が許可されます。The foreach statement is a wrapper around the enumerator, which only allows reading from, not writing to, the collection.

コンストラクター

DictionaryEntry(Object, Object)

指定したキーと値を使用して、DictionaryEntry 型のインスタンスを初期化します。Initializes an instance of the DictionaryEntry type with the specified key and value.

プロパティ

Key

キー/値ペア内のキーを取得または設定します。Gets or sets the key in the key/value pair.

Value

キー/値ペア内の値を取得または設定します。Gets or sets the value in the key/value pair.

メソッド

Deconstruct(Object, Object)

適用対象

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