DictionaryEntry Struktura

Definicja

Definiuje parę klucz/wartość słownika, która może być ustawiona lub pobrana.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
Dziedziczenie
DictionaryEntry
Atrybuty

Przykłady

Poniższy przykład ilustruje użycie DictionaryEntry do iteracji Hashtable przez obiekt.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

Uwagi

IDictionaryEnumerator.Entry Metoda zwraca wystąpienie tego typu.The IDictionaryEnumerator.Entry method returns an instance of this type.

Ważne

Nie zaleca się używania DictionaryEntry struktury do nowych celów programistycznych.We don't recommend that you use the DictionaryEntry structure for new development. Zamiast tego zaleca się użycie struktury ogólnej KeyValuePair<TKey,TValue> wraz Dictionary<TKey,TValue> z klasą.Instead, we recommend that you use a generic KeyValuePair<TKey,TValue> structure along with the Dictionary<TKey,TValue> class. Aby uzyskać więcej informacji, zobacz kolekcje nieogólne nie mogą być używane w serwisie GitHub.For more information, see Non-generic collections shouldn't be used on GitHub.

C# Instrukcja foreach i Visual Basic dla każdej instrukcji wymagają typu każdego elementu w kolekcji.The C# foreach statement and the Visual Basic For Each statement require the type of each element in the collection. Ponieważ każdy element IDictionary jest parą klucz/wartość, typ elementu nie jest typem klucza ani typem wartości.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. Zamiast tego typ elementu to DictionaryEntry.Instead, the element type is DictionaryEntry. Na przykład: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 Instrukcja to otoka wokół modułu wyliczającego, która umożliwia odczyt z kolekcji.The foreach statement is a wrapper around the enumerator, which only allows reading from, not writing to, the collection.

Konstruktory

DictionaryEntry(Object, Object)

Inicjuje wystąpienie DictionaryEntry typu z określonym kluczem i wartością.Initializes an instance of the DictionaryEntry type with the specified key and value.

Właściwości

Key

Pobiera lub ustawia klucz w parze klucz/wartość.Gets or sets the key in the key/value pair.

Value

Pobiera lub ustawia wartość w parze klucz/wartość.Gets or sets the value in the key/value pair.

Metody

Deconstruct(Object, Object)

Dotyczy

Zobacz też