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XPQueryExtensions.SumAsync<T>(IQueryable<T>, Expression<Func<T, Nullable<Int32>>>, CancellationToken) Method

Asynchronously calculates a sum of objects' specific nullable Int32 fields for a query. Uses a lambda expression to obtain values.

Namespace: DevExpress.Xpo

Assembly: DevExpress.Xpo.v19.2.dll

Declaration

public static Task<int? > SumAsync<T>(
    this IQueryable<T> query,
    Expression<Func<T, int? >> selector,
    CancellationToken cancellationToken = default(CancellationToken)
)
<ExtensionAttribute>
Public Shared Function SumAsync(Of T)(
    query As IQueryable(Of T),
    selector As Expression(Of Func(Of T, Integer?)),
    cancellationToken As CancellationToken = Nothing
) As Task(Of Integer?)
public static Task<int? > SumAsync<T>(
    this IQueryable<T> query,
    Expression<Func<T, int? >> selector,
    CancellationToken cancellationToken = default(CancellationToken)
)
<ExtensionAttribute>
Public Shared Function SumAsync(Of T)(
    query As IQueryable(Of T),
    selector As Expression(Of Func(Of T, Integer?)),
    cancellationToken As CancellationToken = Nothing
) As Task(Of Integer?)

Parameters

Name Type Description
query IQueryable<T>

An XPQuery<T> that specifies a persistent object selection.

selector Expression<Func<T, Nullable<Int32>>>

A lambda expression that gets a value from a persistent object.

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 persistent object selection.

selector Expression<Func<T, Nullable<Int32>>>

A lambda expression that gets a value from a persistent object.

cancellationToken CancellationToken

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

Returns

Type Description
Task<Nullable<Int32>>

A Task that returns a sum of objects' specific nullable Int32 fields for a query.

Returns

Type Description
Task<Nullable<Int32>>

A Task that returns a sum of objects' specific nullable Int32 fields for a query.

Type Parameters

Name Description
T

Type Parameters

Name Description
T
See Also