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SortedList<TKey,TValue>.IDictionary.Keys Eigenschaft

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Definition

Namespace:
System.Collections.Generic
Assemblys:
System.dll, System.Collections.dll
Assembly:
System.Collections.dll
Assembly:
System.dll
Assembly:
netstandard.dll
Quelle:
SortedList.cs
Quelle:
SortedList.cs
Quelle:
SortedList.cs

Ruft eine ICollection ab, die die Schlüssel des IDictionary enthält.

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

Eigenschaftswert

ICollection

Eine ICollection, die die Schlüssel des IDictionary enthält.

Implementiert

Keys

Beispiele

Das folgende Codebeispiel zeigt, wie die Keys -Eigenschaft der System.Collections.IDictionary -Schnittstelle mit einem SortedDictionary<TKey,TValue>verwendet wird, um die Schlüssel im Wörterbuch auflisten zu können. Das Beispiel zeigt auch, wie die Schlüssel-Wert-Paare in der sortierten Liste aufgelistet werden. Beachten Sie, dass der Enumerator für die System.Collections.IDictionary Schnittstelle Anstelle KeyValuePair<TKey,TValue> von Objekten Objekte zurückgibtDictionaryEntry.

Das Codebeispiel ist Teil eines größeren Beispiels, einschließlich der Ausgabe, das für die IDictionary.Add -Methode bereitgestellt wird.

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

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

        // Add some elements to the sorted list. 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 sorted list of strings, with string keys,
        ' and access it using the IDictionary interface.
        '
        Dim openWith As IDictionary = _
            New sortedList(Of String, String)
        
        ' Add some elements to the sorted list. 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 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 sorted list 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 sorted list 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 sorted list 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

Hinweise

Die Reihenfolge der Schlüssel im ICollection ist identisch mit der Reihenfolge im SortedList<TKey,TValue>.

Das Abrufen des Werts dieser Eigenschaft ist ein O(1)-Vorgang.

Gilt für:

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