XPQueryExtensions.ElementAtOrDefaultAsync<T>(IQueryable<T>, Int32, CancellationToken) Method

Asynchronously gets an object that has a specific index in a selection. If the index is not valid, returns a default value for <T>.

Namespace: DevExpress.Xpo

Assembly: DevExpress.Xpo.v24.1.dll

NuGet Packages: DevExpress.Win.PivotGrid, DevExpress.Win.TreeMap, DevExpress.Xpo

NuGet Package: DevExpress.Xpo

Declaration

C#

public static Task<T> ElementAtOrDefaultAsync<T>(
    this IQueryable<T> query,
    int index,
    CancellationToken cancellationToken = default(CancellationToken)
)

VB.NET

<ExtensionAttribute>
Public Shared Function ElementAtOrDefaultAsync(Of T)(
    query As IQueryable(Of T),
    index As Integer,
    cancellationToken As CancellationToken = Nothing
) As Task(Of T)

Parameters

Name	Type	Description
query	IQueryable<T>	An XPQuery<T> that specifies a selection of persistent objects.
index	Int32	An Int32 value, which specifies a persistent object’s index.

Optional Parameters

Name	Type	Default	Description
cancellationToken	CancellationToken	null	A CancellationToken object that delivers a cancellation notice to the running operation.

Type Parameters

Name
T

Returns

Type	Description
Task<T>	A Task that returns an object, if the index is valid, or a default value for <T> if the index is not valid.