SortedDictionary<TKey,TValue>.Keys 属性

定义

获取包含 SortedDictionary<TKey,TValue> 中的键的集合。Gets a collection containing the keys in the SortedDictionary<TKey,TValue>.

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

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。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.

此代码是可以编译和执行的更大示例的一部分。This code is part of a larger example that can be compiled and executed. 请参阅 SortedDictionary<TKey,TValue>See 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

SortedDictionary<TKey,TValue>.KeyCollection的键根据Comparer属性进行排序,并与Values属性返回的SortedDictionary<TKey,TValue>.ValueCollection中的关联值顺序相同。The keys in the SortedDictionary<TKey,TValue>.KeyCollection are sorted according to the Comparer property and are in the same order as the associated values in the SortedDictionary<TKey,TValue>.ValueCollection returned by the Values property.

返回SortedDictionary<TKey,TValue>.KeyCollection的不是静态副本; 相反SortedDictionary<TKey,TValue>.KeyCollection ,引用的是原始SortedDictionary<TKey,TValue>中的键。The returned SortedDictionary<TKey,TValue>.KeyCollection is not a static copy; instead, the SortedDictionary<TKey,TValue>.KeyCollection refers back to the keys in the original SortedDictionary<TKey,TValue>. 因此,对的SortedDictionary<TKey,TValue>更改将继续反映SortedDictionary<TKey,TValue>.KeyCollection在中。Therefore, changes to the SortedDictionary<TKey,TValue> continue to be reflected in the SortedDictionary<TKey,TValue>.KeyCollection.

获取此属性的值的运算复杂度为 O (1)。Getting the value of this property is an O(1) operation.

适用于

另请参阅