SortedList<TKey,TValue>.Keys 屬性

定義

命名空間:

System.Collections.Generic

組件:

System.Collections.dll

來源:

SortedList.cs

取得包含 SortedList<TKey,TValue> 中已排序之索引鍵的集合。

public:
 property System::Collections::Generic::IList<TKey> ^ Keys { System::Collections::Generic::IList<TKey> ^ get(); };

public System.Collections.Generic.IList<TKey> Keys { get; }

member this.Keys : System.Collections.Generic.IList<'Key>

Public ReadOnly Property Keys As IList(Of TKey)

屬性值

IList<TKey>

IList<T>，包含 SortedList<TKey,TValue> 中的索引鍵。

範例

下列程式代碼範例示範如何使用 屬性列舉排序列表中的 Keys 索引鍵，以及如何列舉排序列表中的索引鍵和值。

此範例也會示範如何使用 Keys 屬性，以有效率地擷取索引鍵。

此程式代碼是可編譯和執行之較大範例的一部分。 請參閱 SortedList<TKey,TValue>。

// To get the keys alone, use the Keys property.
IList<String^>^ ilistKeys = openWith->Keys;

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

// The Keys property is an efficient way to retrieve
// keys by index.
Console::WriteLine("\nIndexed retrieval using the Keys " +
    "property: Keys[2] = {0}", openWith->Keys[2]);

// To get the keys alone, use the Keys property.
IList<string> ilistKeys = openWith.Keys;

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

// The Keys property is an efficient way to retrieve
// keys by index.
Console.WriteLine("\nIndexed retrieval using the Keys " +
    "property: Keys[2] = {0}", openWith.Keys[2]);

' To get the keys alone, use the Keys property.
Dim ilistKeys As IList(Of String) = openWith.Keys

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

' The Keys property is an efficient way to retrieve
' keys by index.
Console.WriteLine(vbLf & "Indexed retrieval using the " & _
    "Keys property: Keys(2) = {0}", openWith.Keys(2))

// To get the keys alone, use the Keys property.
let ilistKeys = openWith.Keys;

// The elements of the list are strongly typed with the
// type that was specified for the SortedList keys.
Console.WriteLine()
for s in ilistKeys do
    printfn $"Key = {s}"

// The Keys property is an efficient way to retrieve
// keys by index.
printf "\nIndexed retrieval using the Keys "
printfn $"property: Keys[2] = {openWith.Keys[2]}"

// When you use foreach to enumerate list 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 list 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 list 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

// When you use foreach to enumerate list elements,
// the elements are retrieved as KeyValuePair objects.
Console.WriteLine()
for kvp in openWith do
    printfn $"Key = {kvp.Key}, Value = {kvp.Value}"

備註

中的 IList<T> 索引鍵順序與 中 SortedList<TKey,TValue>的順序相同。

傳 IList<T> 回的 不是靜態複本， IList<T> 而是會參考原始 SortedList<TKey,TValue>中的索引鍵。 因此，對的變更 SortedList<TKey,TValue> 會繼續反映在 中 IList<T>。

屬性傳回的 Keys 集合提供有效率的方式，可依索引擷取索引鍵。 存取屬性時不需要重新產生清單，因為清單只是索引鍵內部數位的包裝函式。 下列程式代碼示範如何使用 Keys 屬性，從具有字串索引鍵的已排序元素清單中擷取索引鍵：

String^ v = mySortedList->Values[3];

string v = mySortedList.Values[3];

Dim v As String = mySortedList.Values(3)

let v = mySortedList.Values[3]

擷取這個屬性的值是一種 O(1) 運算。

另請參閱

• IList<T>
• Values