SortedDictionary<TKey,TValue>.Keys 属性

定义

命名空间:

System.Collections.Generic

程序集:

System.Collections.dll

程序集:

System.dll

程序集:

netstandard.dll

获得一个包含 SortedDictionary<TKey,TValue> 中的键的集合。

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

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

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

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

属性值

SortedDictionary<TKey,TValue>.KeyCollection

一个 SortedDictionary<TKey,TValue>.KeyCollection，包含 SortedDictionary<TKey,TValue> 中的键。

示例

下面的代码示例演示如何使用 Keys 属性枚举字典中的键，以及如何枚举字典中的键和值。

此代码是可以编译和执行的大型示例的一部分。 请参阅 SortedDictionary<TKey,TValue>。

// To get the keys alone, use the Keys property.
SortedDictionary<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 SortedDictionary(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();
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

注解

中的SortedDictionary<TKey,TValue>.KeyCollection键按Comparer属性排序，与属性返回Values的SortedDictionary<TKey,TValue>.ValueCollection关联值的顺序相同。

返回的 SortedDictionary<TKey,TValue>.KeyCollection 不是静态副本;而是 SortedDictionary<TKey,TValue>.KeyCollection 引用原始 SortedDictionary<TKey,TValue>副本中的键。 因此，继续反映SortedDictionary<TKey,TValue>.KeyCollection对更改的更改SortedDictionary<TKey,TValue>。

获取此属性的值是 O (1) 操作。

另请参阅

• SortedDictionary<TKey,TValue>.KeyCollection
• Values