Dictionary<TKey,TValue>.KeyCollection Constructor

Reference

Definition

Namespace:: System.Collections.Generic

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

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

Assembly:: System.Collections.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Source:: Dictionary.cs

Source:: Dictionary.cs

Source:: Dictionary.cs

Important

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Initializes a new instance of the Dictionary<TKey,TValue>.KeyCollection class that reflects the keys in the specified Dictionary<TKey,TValue>.

public:
 KeyCollection(System::Collections::Generic::Dictionary<TKey, TValue> ^ dictionary);

public KeyCollection(System.Collections.Generic.Dictionary<TKey,TValue> dictionary);

new System.Collections.Generic.Dictionary<'Key, 'Value>.KeyCollection : System.Collections.Generic.Dictionary<'Key, 'Value> -> System.Collections.Generic.Dictionary<'Key, 'Value>.KeyCollection

Public Sub New (dictionary As Dictionary(Of TKey, TValue))

Parameters

dictionary: Dictionary<TKey,TValue>

The Dictionary<TKey,TValue> whose keys are reflected in the new Dictionary<TKey,TValue>.KeyCollection.

Exceptions

ArgumentNullException

dictionary is null.

Remarks

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

This constructor 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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