DictionaryEntry Estructura

Definición

Define un par clave-valor de diccionario que se puede establecer o recuperar.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
Herencia
DictionaryEntry
Atributos

Ejemplos

En el siguiente ejemplo se muestra el DictionaryEntry uso de para recorrer Hashtable en iteración un objeto.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

Comentarios

El IDictionaryEnumerator.Entry método devuelve una instancia de este tipo.The IDictionaryEnumerator.Entry method returns an instance of this type.

Importante

No se recomienda utilizar la estructura para DictionaryEntry el nuevo desarrollo.We don't recommend that you use the DictionaryEntry structure for new development. En su lugar, se recomienda usar una estructura genérica KeyValuePair<TKey,TValue> junto con la Dictionary<TKey,TValue> clase.Instead, we recommend that you use a generic KeyValuePair<TKey,TValue> structure along with the Dictionary<TKey,TValue> class. Para obtener más información, consulte no se deben usar colecciones no genéricas en github.For more information, see Non-generic collections shouldn't be used on GitHub.

La C# instrucción foreach y el Visual Basic de cada instrucción requieren el tipo de cada elemento de la colección.The C# foreach statement and the Visual Basic For Each statement require the type of each element in the collection. Puesto que cada elemento de IDictionary es un par clave-valor, el tipo de elemento no es el tipo de la clave o el tipo del valor.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. En su lugar, el tipo de DictionaryEntryelemento es.Instead, the element type is DictionaryEntry. Por ejemplo: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

La foreach instrucción es un contenedor alrededor del enumerador, que solo permite la lectura, no la escritura, de la colección.The foreach statement is a wrapper around the enumerator, which only allows reading from, not writing to, the collection.

Constructores

DictionaryEntry(Object, Object)

Inicializa una instancia del tipo DictionaryEntry con la clave y el valor especificados.Initializes an instance of the DictionaryEntry type with the specified key and value.

Propiedades

Key

Obtiene o establece la clave del par clave-valor.Gets or sets the key in the key/value pair.

Value

Obtiene o establece el valor del par clave-valor.Gets or sets the value in the key/value pair.

Métodos

Deconstruct(Object, Object)

Se aplica a

Consulte también: