KeyedCollection<TKey, TItem> Constructor (IEqualityComparer<TKey>)
Initializes a new instance of the KeyedCollection<TKey, TItem> class that uses the specified equality comparer.
Assembly: mscorlib (in mscorlib.dll)
By default, the KeyedCollection<TKey, TItem> includes a lookup dictionary that is created when the first item is added. When an item is added to the KeyedCollection<TKey, TItem>, the item's key is extracted once and saved in the lookup dictionary for faster searches. This behavior can be overridden by using the KeyedCollection<TKey, TItem>(IEqualityComparer<TKey>, Int32) constructor and specifying a dictionary creation threshold.
Because the KeyedCollection<TKey, TItem> class is abstract (MustInherit in Visual Basic), you must derive from it in order to use it. In the constructor for your derived type, call the appropriate KeyedCollection<TKey, TItem> constructor. It is not necessary to expose functionality like the equality comparer or the dictionary creation threshold in your constructors.
This constructor is an O(1) operation.
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