Dictionary<TKey,TValue>.Keys Properti

Definisi

Ruang nama:

System.Collections.Generic

Rakitan:

System.Collections.dll

Sumber:

Dictionary.cs

Mendapatkan koleksi yang berisi kunci di Dictionary<TKey,TValue>.

public:
 property System::Collections::Generic::Dictionary<TKey, TValue>::KeyCollection ^ Keys { System::Collections::Generic::Dictionary<TKey, TValue>::KeyCollection ^ get(); };

public System.Collections.Generic.Dictionary<TKey,TValue>.KeyCollection Keys { get; }

member this.Keys : System.Collections.Generic.Dictionary<'Key, 'Value>.KeyCollection

Public ReadOnly Property Keys As Dictionary(Of TKey, TValue).KeyCollection

Nilai Properti

Dictionary<TKey,TValue>.KeyCollection

yang Dictionary<TKey,TValue>.KeyCollection berisi kunci di Dictionary<TKey,TValue>.

Contoh

Contoh kode berikut menunjukkan cara menghitung kunci dalam kamus menggunakan Keys properti , dan cara menghitung kunci dan nilai dalam kamus.

Kode ini adalah bagian dari contoh yang lebih besar yang dapat dikompilasi dan dijalankan (openWith adalah nama Kamus yang digunakan dalam contoh ini). Lihat Dictionary<TKey,TValue>.

// To get the keys alone, use the Keys property.
Dictionary<String^, String^>::KeyCollection^ keyColl =
    openWith->Keys;

// The elements of the KeyCollection are strongly typed
// with the type that was specified for dictionary keys.
Console::WriteLine();
for each( String^ s in keyColl )
{
    Console::WriteLine("Key = {0}", s);
}

// To get the keys alone, use the Keys property.
Dictionary<string, string>.KeyCollection keyColl =
    openWith.Keys;

// The elements of the KeyCollection are strongly typed
// with the type that was specified for dictionary keys.
Console.WriteLine();
foreach( string s in keyColl )
{
    Console.WriteLine("Key = {0}", s);
}

' To get the keys alone, use the Keys property.
Dim keyColl As _
    Dictionary(Of String, String).KeyCollection = _
    openWith.Keys

' The elements of the KeyCollection are strongly typed
' with the type that was specified for dictionary keys.
Console.WriteLine()
For Each s As String In  keyColl
    Console.WriteLine("Key = {0}", s)
Next s

// When you use foreach to enumerate dictionary elements,
// the elements are retrieved as KeyValuePair objects.
Console::WriteLine();
for each( KeyValuePair<String^, String^> kvp in openWith )
{
    Console::WriteLine("Key = {0}, Value = {1}",
        kvp.Key, kvp.Value);
}

// When you use foreach to enumerate dictionary elements,
// the elements are retrieved as KeyValuePair objects.
Console.WriteLine();
foreach( KeyValuePair<string, string> kvp in openWith )
{
    Console.WriteLine("Key = {0}, Value = {1}",
        kvp.Key, kvp.Value);
}

' When you use foreach to enumerate dictionary elements,
' the elements are retrieved as KeyValuePair objects.
Console.WriteLine()
For Each kvp As KeyValuePair(Of String, String) In openWith
    Console.WriteLine("Key = {0}, Value = {1}", _
        kvp.Key, kvp.Value)
Next kvp

Keterangan

Urutan kunci dalam Dictionary<TKey,TValue>.KeyCollection tidak ditentukan, tetapi urutannya sama dengan nilai terkait dalam yang Dictionary<TKey,TValue>.ValueCollection dikembalikan oleh Values properti .

yang dikembalikan Dictionary<TKey,TValue>.KeyCollection bukan salinan statis; sebaliknya, Dictionary<TKey,TValue>.KeyCollection mengacu kembali ke kunci di aslinya Dictionary<TKey,TValue>. Oleh karena itu, perubahan pada Dictionary<TKey,TValue> terus tercermin dalam Dictionary<TKey,TValue>.KeyCollection.

Mendapatkan nilai properti ini adalah operasi O(1).

Lihat juga

• Dictionary<TKey,TValue>.KeyCollection
• Values