The key of the element is also removed from the lookup dictionary.

If the number of elements has exceeded the dictionary creation threshold and the System.Collections.ObjectModel.KeyedCollection`2 is using a lookup dictionary, it will continue to use a lookup dictionary even though the number of elements is again under the threshold.

This method is an O(n) operation, where n is Collection`1.Count.

Notes for Implementers

Override this method to provide customized behavior for the Collection`1.Remove(`0) and Collection`1.RemoveAt(int) methods, inherited from the System.Collections.ObjectModel.Collection`1 generic class, and the KeyedCollection`2.Remove(`0) method.

Call the base class implementation of this method to remove the item from the underlying collection and to update the lookup dictionary.

Namespace: System.Collections.ObjectModel
Assembly: mscorlib (in mscorlib.dll)
Assembly Versions: 2.0.0.0, 4.0.0.0
Since: .NET 2.0