ObservableGroupedCollectionExtensions.ElementAtOrDefault<TKey,TValue> Method
Definition
Important
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Return the element at position index from the first group with key key.
public static TValue? ElementAtOrDefault<TKey,TValue> (this CommunityToolkit.Common.Collections.ObservableGroupedCollection<TKey,TValue> source, TKey key, int index);static member ElementAtOrDefault : CommunityToolkit.Common.Collections.ObservableGroupedCollection<'Key, 'Value> * 'Key * int -> 'Value<Extension()>
Public Function ElementAtOrDefault(Of TKey, TValue) (source As ObservableGroupedCollection(Of TKey, TValue), key As TKey, index As Integer) As TValueType Parameters
- TKey
The type of the group key.
- TValue
The type of the items in the collection.
Parameters
The source ObservableGroupedCollection<TKey,TValue> instance.
- key
- TKey
The key of the group to query.
- index
- Int32
The index of the item from the targeted group.
Returns
TValue
The element or default(TValue) if it does not exist.