SortedDictionary<TKey,TValue>.Keys Property

Reference

Definition

Namespace:: System.Collections.Generic

Assemblies:: System.dll, System.Collections.dll

Assemblies:: netstandard.dll, System.Collections.dll

Assembly:: System.Collections.dll

Assembly:: System.dll

Assembly:: netstandard.dll

Source:: SortedDictionary.cs

Source:: SortedDictionary.cs

Source:: SortedDictionary.cs

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

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

Property Value

SortedDictionary<TKey,TValue>.KeyCollection

A SortedDictionary<TKey,TValue>.KeyCollection containing the keys in the SortedDictionary<TKey,TValue>.

Examples

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.

This code is part of a larger example that can be compiled and executed. 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

Remarks

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.

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>. Therefore, changes to the SortedDictionary<TKey,TValue> continue to be reflected in the SortedDictionary<TKey,TValue>.KeyCollection.

Getting the value of this property is an O(1) operation.

Applies to

Product	Versions
.NET	Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10
.NET Framework	2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard	1.0, 1.1, 1.2, 1.3, 1.4, 1.6, 2.0, 2.1
UWP	10.0

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