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

Asynchronously gets the first object that meets specified requirements in a selection. Throws an exception for empty selections.

Namespace: DevExpress.Xpo

Assembly: DevExpress.Xpo.v19.2.dll

Declaration

public static Task<T> FirstAsync<T>(
    this IQueryable<T> query,
    Expression<Func<T, bool>> predicate,
    CancellationToken cancellationToken = default(CancellationToken)
)
<ExtensionAttribute>
Public Shared Function FirstAsync(Of T)(
    query As IQueryable(Of T),
    predicate As Expression(Of Func(Of T, Boolean)),
    cancellationToken As CancellationToken = Nothing
) As Task(Of T)
public static Task<T> FirstAsync<T>(
    this IQueryable<T> query,
    Expression<Func<T, bool>> predicate,
    CancellationToken cancellationToken = default(CancellationToken)
)
<ExtensionAttribute>
Public Shared Function FirstAsync(Of T)(
    query As IQueryable(Of T),
    predicate As Expression(Of Func(Of T, Boolean)),
    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.

predicate Expression<Func<T, Boolean>>

An expression which determines requirements the persistent object needs to meet.

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.

predicate Expression<Func<T, Boolean>>

An expression which determines requirements the persistent object needs to meet.

cancellationToken CancellationToken

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

Returns

Type Description
Task<T>

A Task that returns the first object to meet specified requirements in a selection.

Returns

Type Description
Task<T>

A Task that returns the first object to meet specified requirements in a selection.

Type Parameters

Name Description
T

Type Parameters

Name Description
T
See Also