Dictionary<TKey,TValue>.Keys 속성

정의

Dictionary<TKey,TValue>의 키를 포함하는 컬렉션을 가져옵니다.Gets a collection containing the keys in the 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

속성 값

예제

다음 코드 예제에서는 Keys 속성을 사용 하 여 사전에서 키를 열거 하는 방법과 사전에서 키와 값을 열거 하는 방법을 보여 줍니다.The following code example shows how to enumerate the keys in the dictionary using the Keys property, and how to enumerate the keys and values in the dictionary.

이 코드는 컴파일 및 실행할 수 있는 더 큰 예제의 일부입니다 (openWith은이 예제에서 사용 되는 사전의 이름).This code is part of a larger example that can be compiled and executed (openWith is the name of the Dictionary used in this example). Dictionary<TKey,TValue>을 참조하세요.See 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

설명

Dictionary<TKey,TValue>.KeyCollection 키의 순서는 지정 되지 않지만 Values 속성이 반환 하는 Dictionary<TKey,TValue>.ValueCollection의 연결 된 값과 순서가 동일 합니다.The order of the keys in the Dictionary<TKey,TValue>.KeyCollection is unspecified, but it is the same order as the associated values in the Dictionary<TKey,TValue>.ValueCollection returned by the Values property.

반환 된 Dictionary<TKey,TValue>.KeyCollection은 정적 복사본이 아닙니다. 대신 Dictionary<TKey,TValue>.KeyCollection는 원래 Dictionary<TKey,TValue>의 키를 다시 참조 합니다.The returned Dictionary<TKey,TValue>.KeyCollection is not a static copy; instead, the Dictionary<TKey,TValue>.KeyCollection refers back to the keys in the original Dictionary<TKey,TValue>. 따라서 Dictionary<TKey,TValue> 변경 내용은 Dictionary<TKey,TValue>.KeyCollection에 계속 반영 됩니다.Therefore, changes to the Dictionary<TKey,TValue> continue to be reflected in the Dictionary<TKey,TValue>.KeyCollection.

이 속성의 값을 가져오는 것은 o (1) 작업입니다.Getting the value of this property is an O(1) operation.

적용 대상

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