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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: 2.2.0
public static Task<Nullable<long>> SumAsync<TSource>(
	this IMongoQueryable<TSource> source,
	Expression<Func<TSource, Nullable<long>>> selector,
	CancellationToken cancellationToken = null


Type: MongoDB.Driver.LinqIMongoQueryableTSource
A sequence of values.
Type: System.Linq.ExpressionsExpressionFuncTSource, NullableInt64
A projection function to apply to each element.
cancellationToken (Optional)
Type: System.ThreadingCancellationToken
The cancellation token.

Type Parameters

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