DictionaryEntry Struktura

Definice

Definuje dvojici klíč/hodnota slovníku, která se dá nastavit nebo načíst.Defines a dictionary key/value pair that can be set or retrieved.

public value class DictionaryEntry
public struct DictionaryEntry
[System.Serializable]
public struct DictionaryEntry
[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public struct DictionaryEntry
type DictionaryEntry = struct
[<System.Serializable>]
type DictionaryEntry = struct
[<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type DictionaryEntry = struct
Public Structure DictionaryEntry
Dědičnost
DictionaryEntry
Atributy

Příklady

Následující příklad ukazuje použití DictionaryEntry pro iteraci pomocí Hashtable objektu.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

Poznámky

IDictionaryEnumerator.EntryMetoda vrátí instanci tohoto typu.The IDictionaryEnumerator.Entry method returns an instance of this type.

Důležité

Nedoporučujeme používat DictionaryEntry strukturu pro nový vývoj.We don't recommend that you use the DictionaryEntry structure for new development. Místo toho doporučujeme použít obecnou KeyValuePair<TKey,TValue> strukturu spolu s Dictionary<TKey,TValue> třídou.Instead, we recommend that you use a generic KeyValuePair<TKey,TValue> structure along with the Dictionary<TKey,TValue> class. Další informace najdete v tématu neobecné kolekce, které by se neměly používat na GitHubu.For more information, see Non-generic collections shouldn't be used on GitHub.

Příkaz jazyka C# foreach a Visual Basic pro každý příkaz vyžadují typ každého prvku v kolekci.The C# foreach statement and the Visual Basic For Each statement require the type of each element in the collection. Vzhledem k tomu, že každý prvek IDictionary je dvojice klíč/hodnota, typ prvku není typ klíče nebo typ hodnoty.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. Místo toho je typ prvku DictionaryEntry .Instead, the element type is DictionaryEntry. Například: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

foreachPříkaz je Obálka kolem čítače, který umožňuje pouze čtení z, nikoli zápis do kolekce.The foreach statement is a wrapper around the enumerator, which only allows reading from, not writing to, the collection.

Konstruktory

DictionaryEntry(Object, Object)

Inicializuje instanci DictionaryEntry typu se zadaným klíčem a hodnotou.Initializes an instance of the DictionaryEntry type with the specified key and value.

Vlastnosti

Key

Získá nebo nastaví klíč v páru klíč/hodnota.Gets or sets the key in the key/value pair.

Value

Získá nebo nastaví hodnotu v páru klíč/hodnota.Gets or sets the value in the key/value pair.

Metody

Deconstruct(Object, Object)

Dekonstruuje aktuální DictionaryEntry .Deconstructs the current DictionaryEntry.

Platí pro

Viz také