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.NET Standard 2.0+

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.v19.2.dll

Declaration

public static Task<T> ElementAtOrDefaultAsync<T>(
    this IQueryable<T> query,
    int index,
    CancellationToken cancellationToken = default(CancellationToken)
)
<ExtensionAttribute>
Public Shared Function ElementAtOrDefaultAsync(Of T)(
    query As IQueryable(Of T),
    index As Integer,
    cancellationToken As CancellationToken = Nothing
) As Task(Of T)
public static Task<T> ElementAtOrDefaultAsync<T>(
    this IQueryable<T> query,
    int index,
    CancellationToken cancellationToken = default(CancellationToken)
)
<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.

cancellationToken CancellationToken

A CancellationToken object that delivers a cancellation notice to the running operation.

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.

cancellationToken CancellationToken

A CancellationToken object that delivers a cancellation notice to the running operation.

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.

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.

Type Parameters

Name Description
T

Type Parameters

Name Description
T
See Also