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MongoQueryableSumAsyncTSource Method (IMongoQueryableTSource, ExpressionFuncTSource, NullableInt64, CancellationToken)

Computes the sum of the sequence of NullableT 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: 2.17.0+b316340e6cc3a8bfc8638dc31b54fbbfe41bfcb2
Syntax
public static Task<long?> SumAsync<TSource>(
	this IMongoQueryable<TSource> source,
	Expression<Func<TSource, long?>> selector,
	CancellationToken cancellationToken = default
)

Parameters

source
Type: MongoDB.Driver.LinqIMongoQueryableTSource
A sequence of values.
selector
Type: System.Linq.ExpressionsExpressionFuncTSource, NullableInt64
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: TaskNullableInt64
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