QueryableExtensionMethodsCountColumnAsyncTSource, TColumnType Method (IQueryableTSource, ExpressionFuncTSource, TColumnType, CancellationToken) |
Async variant of CountColumn.
Namespace:
SD.LLBLGen.Pro.LinqSupportClasses
Assembly:
SD.LLBLGen.Pro.ORMSupportClasses (in SD.LLBLGen.Pro.ORMSupportClasses.dll) Version: 5.11.0.0 (5.11.23.1114)
Syntax public static Task<int> CountColumnAsync<TSource, TColumnType>(
this IQueryable<TSource> source,
Expression<Func<TSource, TColumnType>> selector,
CancellationToken cancellationToken
)
<ExtensionAttribute>
Public Shared Function CountColumnAsync(Of TSource, TColumnType) (
source As IQueryable(Of TSource),
selector As Expression(Of Func(Of TSource, TColumnType)),
cancellationToken As CancellationToken
) As Task(Of Integer)
Parameters
- source
- Type: System.LinqIQueryableTSource
The source. - selector
- Type: System.Linq.ExpressionsExpressionFuncTSource, TColumnType
The selector. A projection function to apply to each element. - cancellationToken
- Type: System.ThreadingCancellationToken
The cancellation token.
Type Parameters
- TSource
- The type of the source.
- TColumnType
- The type of the column.
Return Value
Type:
TaskInt32
The number of values.
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 to the set to count. If you want the total of distinct values, use the overload which accepts a boolean.
See Also