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MongoQueryableStandardDeviationPopulationAsyncTSource Method (IMongoQueryableTSource, ExpressionFuncTSource, NullableDecimal, CancellationToken)
Computes the population standard deviation of a sequence of values that are obtained by invoking a transform 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<decimal>> StandardDeviationPopulationAsync<TSource>(
	this IMongoQueryable<TSource> source,
	Expression<Func<TSource, Nullable<decimal>>> selector,
	CancellationToken cancellationToken = null


Type: MongoDB.Driver.LinqIMongoQueryableTSource
A sequence of values to calculate the population standard deviation of.
Type: System.Linq.ExpressionsExpressionFuncTSource, NullableDecimal
A transform 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: TaskNullableDecimal
The population standard deviation of the sequence of 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