ObservableGroupedCollectionExtensions.First<TKey,TValue> Method

Reference

Definition

Namespace:: CommunityToolkit.Common.Collections

Assembly:: CommunityToolkit.Common.dll

Package:: CommunityToolkit.Common v7.0.3

Important

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Return the first group with key key.

public static CommunityToolkit.Common.Collections.ObservableGroup<TKey,TValue> First<TKey,TValue> (this CommunityToolkit.Common.Collections.ObservableGroupedCollection<TKey,TValue> source, TKey key);

static member First : CommunityToolkit.Common.Collections.ObservableGroupedCollection<'Key, 'Value> * 'Key -> CommunityToolkit.Common.Collections.ObservableGroup<'Key, 'Value>

<Extension()>
Public Function First(Of TKey, TValue) (source As ObservableGroupedCollection(Of TKey, TValue), key As TKey) As ObservableGroup(Of TKey, TValue)

Type Parameters

TKey

The type of the group key.

TValue

The type of the items in the collection.

Parameters

source: ObservableGroupedCollection<TKey,TValue>

The source ObservableGroupedCollection<TKey,TValue> instance.

key: TKey

The key of the group to query.

Returns

ObservableGroup<TKey,TValue>

The first group matching key.

Exceptions

InvalidOperationException

The target group does not exist.

Applies to

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