SortedList<TKey,TValue>.IDictionary.Keys Eigenschaft

  • Referenz

Definition

Namespace:
System.Collections.Generic
Assemblys:
System.dll, System.Collections.dll
Assembly:
System.Collections.dll
Assembly:
System.dll
Assembly:
netstandard.dll

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

Im folgenden Codebeispiel wird gezeigt, wie die Keys Eigenschaft der System.Collections.IDictionary Schnittstelle mit einem SortedDictionary<TKey,TValue>, zum Auflisten der Schlüssel im Wörterbuch verwendet wird. Das Beispiel zeigt auch, wie sie die Schlüssel-/Wertpaare in der sortierten Liste aufzählen; Beachten Sie, dass der Aufzählungsator für die System.Collections.IDictionary Schnittstelle Objekte anstelle von KeyValuePair<TKey,TValue> Objekten zurückgibtDictionaryEntry.

Das Codebeispiel ist Teil eines größeren Beispiels, einschließlich der Ausgabe, die 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 Tasten in der ICollection Taste entspricht der Reihenfolge in der SortedList<TKey,TValue>.

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

Gilt für:

Siehe auch