XPQueryExtensions.SumAsync<T>(IQueryable<T>, Expression<Func<T, Int64>>, CancellationToken) Method

Asynchronously calculates a sum of objects’ specific Int64 fields, for a query. Uses a lambda expression to obtain values.

Namespace: DevExpress.Xpo

Assembly: DevExpress.Xpo.v21.2.dll

Declaration

C#

public static Task<long> SumAsync<T>(
    this IQueryable<T> query,
    Expression<Func<T, long>> selector,
    CancellationToken cancellationToken = default(CancellationToken)
)

VB.NET

<ExtensionAttribute>
Public Shared Function SumAsync(Of T)(
    query As IQueryable(Of T),
    selector As Expression(Of Func(Of T, Long)),
    cancellationToken As CancellationToken = Nothing
) As Task(Of Long)

Parameters

Name	Type	Description
query	IQueryable<T>	An XPQuery<T> that specifies a persistent object selection.
selector	Expression<Func<T, Int64>>	A lambda expression that gets a value from a persistent object.

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<Int64>	A Task that returns a sum of objects’ specific Int64 fields, for a query.