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XPQueryExtensions.SumAsync<T>(IQueryable<T>, Expression<Func<T, Nullable<Double>>>, CancellationToken) Method
Asynchronously calculates a sum of objects' specific nullable Double fields for a query. Uses a lambda expression to obtain values.
Namespace: DevExpress.Xpo
Assembly: DevExpress.Xpo.v19.2.dll
Declaration
public static Task<double? > SumAsync<T>(
this IQueryable<T> query,
Expression<Func<T, double? >> selector,
CancellationToken cancellationToken = default(CancellationToken)
)<ExtensionAttribute>
Public Shared Function SumAsync(Of T)(
query As IQueryable(Of T),
selector As Expression(Of Func(Of T, Double?)),
cancellationToken As CancellationToken = Nothing
) As Task(Of Double?)public static Task<double? > SumAsync<T>(
this IQueryable<T> query,
Expression<Func<T, double? >> selector,
CancellationToken cancellationToken = default(CancellationToken)
)<ExtensionAttribute>
Public Shared Function SumAsync(Of T)(
query As IQueryable(Of T),
selector As Expression(Of Func(Of T, Double?)),
cancellationToken As CancellationToken = Nothing
) As Task(Of Double?)Parameters
| Name | Type | Description |
|---|---|---|
| query | IQueryable<T> | An XPQuery<T> object that specifies a persistent object selection. |
| selector | Expression<Func<T, Nullable<Double>>> | 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> object that specifies a persistent object selection. |
| selector | Expression<Func<T, Nullable<Double>>> | 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<Double>> | A Task that returns a sum of objects' specific nullable Double fields for a query. |
Returns
| Type | Description |
|---|---|
| Task<Nullable<Double>> | A Task that returns a sum of objects' specific nullable Double fields for a query. |
Type Parameters
| Name | Description |
|---|---|
| T |
Type Parameters
| Name | Description |
|---|---|
| T |