XPQueryExtensions.SumAsync<T>(IQueryable<T>, Expression<Func<T, Double>>, CancellationToken) Method
Asynchronously calculates a sum of objects’ specific Double fields for a query. Uses a lambda expression to obtain values.
Namespace: DevExpress.Xpo
Assembly: DevExpress.Xpo.v18.2.dll
Declaration
public static Task<double> SumAsync<T>(
this IQueryable<T> query,
Expression<Func<T, double>> selector,
CancellationToken cancellationToken = default(CancellationToken)
)
Parameters
Name | Type | Description |
---|---|---|
query | IQueryable<T> | An XPQuery<T> that specifies a persistent object selection. |
selector | Expression<Func<T, Double>> | 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<Double> | A Task that returns a sum of objects’ specific Double fields for a query. |
See Also