QueryableExtensionMethodsVarianceAsyncTSource, TColumnType Method (IQueryableTSource, ExpressionFuncTSource, TColumnType)

Async variant of Variance.

Namespace: SD.LLBLGen.Pro.LinqSupportClasses
Assembly: SD.LLBLGen.Pro.ORMSupportClasses (in SD.LLBLGen.Pro.ORMSupportClasses.dll) Version: 5.10.0.0 (5.10.0)

Syntax

Copy

public static Task<double> VarianceAsync<TSource, TColumnType>(
	this IQueryable<TSource> source,
	Expression<Func<TSource, TColumnType>> selector
)

<ExtensionAttribute>
Public Shared Function VarianceAsync(Of TSource, TColumnType) ( 
	source As IQueryable(Of TSource),
	selector As Expression(Of Func(Of TSource, TColumnType))
) As Task(Of Double)

Parameters

source: Type: System.LinqIQueryableTSource
The source.
selector: Type: System.Linq.ExpressionsExpressionFuncTSource, TColumnType
The selector.

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.

Reference

QueryableExtensionMethods Class

VarianceAsync Overload

SD.LLBLGen.Pro.LinqSupportClasses Namespace