QueryableExtensionMethods.CountColumn<TSource, TColumnType> Method (IQueryable<TSource>, Expression<Func<TSource, TColumnType>>, Boolean)

returns the number of distinct values in the set specified by selector which is 1 column wide

Namespace: SD.LLBLGen.Pro.LinqSupportClasses
Assembly: SD.LLBLGen.Pro.ORMSupportClasses (in SD.LLBLGen.Pro.ORMSupportClasses.dll) Version: 5.8.0.0 (5.8.21.0111)

Syntax

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public static int CountColumn<TSource, TColumnType>(
	this IQueryable<TSource> source,
	Expression<Func<TSource, TColumnType>> selector,
	bool applyDistinct
)

<ExtensionAttribute>
Public Shared Function CountColumn(Of TSource, TColumnType) ( 
	source As IQueryable(Of TSource),
	selector As Expression(Of Func(Of TSource, TColumnType)),
	applyDistinct As Boolean
) As Integer

Parameters

source: Type: System.Linq.IQueryable<TSource>
The source.
selector: Type: System.Linq.Expressions.Expression<Func<TSource, TColumnType>>
The selector. A projection function to apply to each element.
applyDistinct: Type: System.Boolean
if set to true, DISTINCT is applied on the set to count.

Type Parameters

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

Return Value

Type: Int32
The number of distinct values.

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).

Reference

QueryableExtensionMethods Class

CountColumn Overload

SD.LLBLGen.Pro.LinqSupportClasses Namespace