Dictionary<TKey,TValue>.KeyCollection Constructor

Definition

Namespace:

System.Collections.Generic

Assembly:

System.Collections.dll

Source:

Dictionary.cs

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.