.NET Framework 4.5.2+
.NET Framework 4.5.2+
.NET Standard 2.0+

XPQueryExtensions.FirstAsync<T>(IQueryable<T>, CancellationToken) Method

Asynchronously gets the first object in a selection. Throws an exception for empty selections.

Namespace: DevExpress.Xpo

Assembly: DevExpress.Xpo.v20.1.dll

Declaration

public static Task<T> FirstAsync<T>(
    this IQueryable<T> query,
    CancellationToken cancellationToken = default(CancellationToken)
)
<ExtensionAttribute>
Public Shared Function FirstAsync(Of T)(
    query As IQueryable(Of T),
    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.

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 the first object in a selection.

See Also