KeyedCollection<TKey, TItem>.Dictionary Property

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Gets the lookup dictionary of the KeyedCollection<TKey, TItem>.

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

Syntax

'Declaration
Protected ReadOnly Property Dictionary As IDictionary(Of TKey, TItem)

protected IDictionary<TKey, TItem> Dictionary { get; }

Type: System.Collections.Generic.IDictionary<TKey, TItem>
The lookup dictionary of the KeyedCollection<TKey, TItem>, if it exists; otherwise, nulla null reference (Nothing in Visual Basic).

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.

Retrieving the value of this property is an O(1) operation.

Supported in: 5, 4, 3

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

Supported in: Xbox 360, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.