Count<TSource>(IEntityScalarQuery<TSource>,Expression<Func<TSource,Boolean>>,CancellationToken) Method

Returns the number of elements in the specified sequence that satisfies a condition. Pass in a System.Threading.CancellationToken to cancel operation.

Syntax

Visual Basic
C#

'Declaration
 
<ExtensionAttribute()>
Public Overloads Shared Function Count(Of TSource)( _
   ByVal source As IEntityScalarQuery(Of TSource), _
   ByVal predicate As Expression(Of Func(Of TSource,Boolean)), _
   ByVal cancellationToken As CancellationToken _
) As Task(Of Integer)

'Usage
 
Dim source As IEntityScalarQuery(Of TSource)
Dim predicate As Expression(Of Func(Of TSource,Boolean))
Dim cancellationToken As CancellationToken
Dim value As Task(Of Integer)
 
value = EntityScalarAsyncExtensions.Count(Of TSource)(source, predicate, cancellationToken)

[Extension()]
public static Task<int> Count<TSource>( 
   IEntityScalarQuery<TSource> source,
   Expression<Func<TSource,bool>> predicate,
   CancellationToken cancellationToken
)

Parameters

source
predicate
cancellationToken

Type Parameters

TSource

Example

public async void AsyncCountWithPredicate() {
  int empCount = await _entityManager.Employees.AsScalarAsync().Count(e => e.BirthDate > DateTime.Parse("1/1/1955"));
}

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

EntityScalarAsyncExtensions Class
EntityScalarAsyncExtensions Members
Overload List