Dictionary(TKey, TValue).KeyCollection Constructor

Dictionary<TKey, TValue>.KeyCollection Constructor (Dictionary<TKey, TValue>)


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

Namespace:   System.Collections.Generic
Assembly:  mscorlib (in mscorlib.dll)

public KeyCollection(
	Dictionary<TKey, TValue> dictionary


Type: System.Collections.Generic.Dictionary<TKeyTValue>

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

Exception Condition

dictionary is null.

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.

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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