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MongoQueryableStandardDeviationSampleAsyncTSource Method (IMongoQueryableTSource, ExpressionFuncTSource, NullableInt64, CancellationToken)
Computes the sample 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: 2.4.1
Syntax
public static Task<Nullable<double>> StandardDeviationSampleAsync<TSource>(
	this IMongoQueryable<TSource> source,
	Expression<Func<TSource, Nullable<long>>> selector,
	CancellationToken cancellationToken = null
)

Parameters

source
Type: MongoDB.Driver.LinqIMongoQueryableTSource
A sequence of values to calculate the population standard deviation of.
selector
Type: System.Linq.ExpressionsExpressionFuncTSource, NullableInt64
A transform 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: TaskNullableDouble
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