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Class OrderedHashSet<T>

A custom collection similar to HashSet{T} which only contains unique items, however this collection keeps items in order and is customizable to keep the newest or oldest equatable item

Inheritance

object

Collection<T>

KeyedCollection<T, T>

Namespace: Umbraco.Cms.Core.Collections

Assembly: Umbraco.Core.dll

Syntax

public class OrderedHashSet<T> : KeyedCollection<T, T> where T : notnull

Type Parameters

Name	Description
T

Constructors

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OrderedHashSet(bool)

Declaration

public OrderedHashSet(bool keepOldest = true)

Parameters

Type	Name	Description
bool	keepOldest

Methods

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GetKeyForItem(T)

When implemented in a derived class, extracts the key from the specified element.

Declaration

protected override T GetKeyForItem(T item)

Parameters

Type	Name	Description
T	item	The element from which to extract the key.

Returns

Type	Description
T	The key for the specified element.

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InsertItem(int, T)

Inserts an element into the System.Collections.ObjectModel.KeyedCollection<TKey, TItem> at the specified index.

Declaration

protected override void InsertItem(int index, T item)

Parameters

Type	Name	Description
int	index	The zero-based index at which `item` should be inserted.
T	item	The object to insert.

Exceptions

Type	Condition
ArgumentOutOfRangeException	`<code class="paramref">index</code> is less than 0.` -or- `index` is greater than System.Collections.ObjectModel.Collection<T>.Count.