Dictionary<TKey, TValue>.KeyCollection Constructor (Dictionary<TKey, TValue>)
.NET Framework (current version)
Initializes a new instance of the Dictionary<TKey, TValue>.KeyCollection class that reflects the keys in the specified Dictionary<TKey, TValue>.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- dictionary
-
Type:
System.Collections.Generic.Dictionary<TKey, TValue>
The Dictionary<TKey, TValue> whose keys are reflected in the new Dictionary<TKey, TValue>.KeyCollection.
| Exception | Condition |
|---|---|
| ArgumentNullException | 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 8
.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
Available since 8
.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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