QueryableExtensionMethods.VarianceAsync<TSource, TColumnType> Method (IQueryable<TSource>, Expression<Func<TSource, TColumnType>>, CancellationToken) |
Async variant of Variance.
Namespace:
SD.LLBLGen.Pro.LinqSupportClasses
Assembly:
SD.LLBLGen.Pro.ORMSupportClasses (in SD.LLBLGen.Pro.ORMSupportClasses.dll) Version: 5.4.0.0 (5.4.0)
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.Linq.IQueryable<TSource>
The source. - selector
- Type: System.Linq.Expressions.Expression<Func<TSource, TColumnType>>
The selector. - cancellationToken
- Type: System.Threading.CancellationToken
The cancellation token.
Type Parameters
- TSource
- The type of the source.
- TColumnType
- The type of the column type.
Return Value
Type:
Task<Double>
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
IQueryable<TSource>. 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