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: 5.9.0.0 (5.9.0)
Syntax public static Task<double> VarianceAsync<TSource, TColumnType>(
this IQueryable<TSource> source,
Expression<Func<TSource, TColumnType>> selector,
CancellationToken cancellationToken
)
<ExtensionAttribute>
Public Shared Function VarianceAsync(Of TSource, TColumnType) (
source As IQueryable(Of TSource),
selector As Expression(Of Func(Of TSource, TColumnType)),
cancellationToken As CancellationToken
) As Task(Of Double)
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