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MongoQueryableSumAsyncTSource Method (IMongoQueryableTSource, ExpressionFuncTSource, Double, CancellationToken)

Computes the sum of the sequence of Double values that is obtained by invoking a projection function on each element of the input sequence.

Namespace:  MongoDB.Driver.Linq
Assembly:  MongoDB.Driver (in MongoDB.Driver.dll) Version: 2.11.0+cb27a82ea70620ad1acad8058809be8302ae4f2a
Syntax
public static Task<double> SumAsync<TSource>(
	this IMongoQueryable<TSource> source,
	Expression<Func<TSource, double>> selector,
	CancellationToken cancellationToken = null
)

Parameters

source
Type: MongoDB.Driver.LinqIMongoQueryableTSource
A sequence of values.
selector
Type: System.Linq.ExpressionsExpressionFuncTSource, Double
A projection function to apply to each element.
cancellationToken (Optional)
Type: System.ThreadingCancellationToken
The cancellation token.

Type Parameters

TSource
The type of the elements of source.

Return Value

Type: TaskDouble
The sum of the projected values.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IMongoQueryableTSource. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).
See Also