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QueryableExtensionMethodsVarianceAsyncTSource, TColumnType Method (IQueryableTSource, ExpressionFuncTSource, TColumnType, CancellationToken)

Async variant of Variance.

Namespace:  SD.LLBLGen.Pro.LinqSupportClasses
Assembly:  SD.LLBLGen.Pro.ORMSupportClasses (in SD.LLBLGen.Pro.ORMSupportClasses.dll) Version: 5.6.0.0 (5.6.19.0117)
Syntax
public static Task<double> VarianceAsync<TSource, TColumnType>(
	this IQueryable<TSource> source,
	Expression<Func<TSource, TColumnType>> selector,
	CancellationToken cancellationToken
)

Parameters

source
Type: System.LinqIQueryableTSource
The source.
selector
Type: System.Linq.ExpressionsExpressionFuncTSource, TColumnType
The selector.
cancellationToken
Type: System.ThreadingCancellationToken
The cancellation token.

Type Parameters

TSource
The type of the source.
TColumnType
The type of the column type.

Return Value

Type: TaskDouble
The variance over the values in the column specified by selector.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IQueryableTSource. 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).
Remarks
doesn't apply DISTINCT. If you want the variance over only distinct values, use the overload which accepts a boolean.
See Also