Dictionary<TKey,TValue>.IDictionary.Keys Özellik

Tanım

ICollectionAnahtarlarını içeren bir alır IDictionary .Gets an ICollection containing the keys of the IDictionary.

property System::Collections::ICollection ^ System::Collections::IDictionary::Keys { System::Collections::ICollection ^ get(); };
System.Collections.ICollection System.Collections.IDictionary.Keys { get; }
member this.System.Collections.IDictionary.Keys : System.Collections.ICollection
 ReadOnly Property Keys As ICollection Implements IDictionary.Keys

Özellik Değeri

ICollection

ICollectionÖğesinin anahtarlarını içeren bir IDictionary .An ICollection containing the keys of the IDictionary.

Uygulamalar

Örnekler

Aşağıdaki kod örneği, IDictionary.Keys System.Collections.IDictionary Dictionary<TKey,TValue> Sözlükteki anahtarları listelemek için bir ile arabirimin özelliğinin nasıl kullanılacağını gösterir.The following code example shows how to use the IDictionary.Keys property of the System.Collections.IDictionary interface with a Dictionary<TKey,TValue>, to list the keys in the dictionary. Örnek ayrıca sözlükte anahtar/değer çiftlerinin nasıl numaralandırılacağını gösterir; arabirim için numaralandırıcı System.Collections.IDictionary DictionaryEntry nesneler yerine nesneleri döndürdüğünü unutmayın KeyValuePair<TKey,TValue> .The example also shows how to enumerate the key/value pairs in the dictionary; note that the enumerator for the System.Collections.IDictionary interface returns DictionaryEntry objects rather than KeyValuePair<TKey,TValue> objects.

Kod örneği, yöntemi için sağlanmış olan output dahil daha büyük bir örneğin bir parçasıdır IDictionary.Add .The code example is part of a larger example, including output, provided for the IDictionary.Add method.

using System;
using System.Collections;
using System.Collections.Generic;

public class Example
{
    public static void Main()
    {
        // Create a new dictionary of strings, with string keys,
        // and access it using the IDictionary interface.
        //
        IDictionary openWith = new Dictionary<string, string>();

        // Add some elements to the dictionary. There are no
        // duplicate keys, but some of the values are duplicates.
        // IDictionary.Add throws an exception if incorrect types
        // are supplied for key or value.
        openWith.Add("txt", "notepad.exe");
        openWith.Add("bmp", "paint.exe");
        openWith.Add("dib", "paint.exe");
        openWith.Add("rtf", "wordpad.exe");
Imports System.Collections
Imports System.Collections.Generic

Public Class Example
    
    Public Shared Sub Main() 

        ' Create a new dictionary of strings, with string keys,
        ' and access it using the IDictionary interface.
        '
        Dim openWith As IDictionary = _
            New Dictionary(Of String, String)
        
        ' Add some elements to the dictionary. There are no 
        ' duplicate keys, but some of the values are duplicates.
        ' IDictionary.Add throws an exception if incorrect types
        ' are supplied for key or value.
        openWith.Add("txt", "notepad.exe")
        openWith.Add("bmp", "paint.exe")
        openWith.Add("dib", "paint.exe")
        openWith.Add("rtf", "wordpad.exe")
// To get the keys alone, use the Keys property.
icoll = openWith.Keys;

// The elements of the collection are strongly typed
// with the type that was specified for dictionary keys,
// even though the ICollection interface is not strongly
// typed.
Console.WriteLine();
foreach( string s in icoll )
{
    Console.WriteLine("Key = {0}", s);
}
' To get the keys alone, use the Keys property.
icoll = openWith.Keys

' The elements of the collection are strongly typed
' with the type that was specified for dictionary keys,
' even though the ICollection interface is not strongly
' typed.
Console.WriteLine()
For Each s As String In  icoll
    Console.WriteLine("Key = {0}", s)
Next s
// When you use foreach to enumerate dictionary elements
// with the IDictionary interface, the elements are retrieved
// as DictionaryEntry objects instead of KeyValuePair objects.
Console.WriteLine();
foreach( DictionaryEntry de in openWith )
{
    Console.WriteLine("Key = {0}, Value = {1}",
        de.Key, de.Value);
}
' When you use foreach to enumerate dictionary elements
' with the IDictionary interface, the elements are retrieved
' as DictionaryEntry objects instead of KeyValuePair objects.
Console.WriteLine()
For Each de As DictionaryEntry In openWith
    Console.WriteLine("Key = {0}, Value = {1}", _
        de.Key, de.Value)
Next 
    }
}

    End Sub

End Class

Açıklamalar

Döndürülen anahtarların sırası ICollection belirtilmemiş, ancak özelliğin döndürdüğü karşılık gelen değerlerle aynı sırada olması garanti edilir ICollection Values .The order of the keys in the returned ICollection is unspecified, but it is guaranteed to be the same order as the corresponding values in the ICollection returned by the Values property.

Bu özelliğin değerinin alınması bir O (1) işlemidir.Getting the value of this property is an O(1) operation.

Şunlara uygulanır

Ayrıca bkz.