Sum<TSource,TResult>(IEntityScalarQuery<TSource>,Expression<Func<TSource,TResult>>) Method

Computes the sum of the sequence of numeric values that is obtained by invoking a projection function on each element of the input sequence.

Syntax

Visual Basic
C#

'Declaration
 
<ExtensionAttribute()>
Public Overloads Shared Function Sum
    (Of TSource,TResult)( _
   ByVal source As IEntityScalarQuery(Of TSource), _
   ByVal projection As Expression(Of Func(Of TSource,TResult)) _
) As Task(Of TResult)

'Usage
 
Dim source As IEntityScalarQuery(Of TSource)
Dim projection As Expression(Of Func(Of TSource,TResult))
Dim value As Task(Of TResult)
 
value = EntityScalarAsyncExtensions.Sum(Of TSource, TResult)(source, projection)

[Extension()]
public static Task<TResult> Sum<TSource,TResult>( 
   IEntityScalarQuery<TSource> source,
   Expression<Func<TSource,TResult>> projection
)

Parameters

source
projection

Type Parameters

TSource
TResult

Example

public async void AsyncSumWithPredicate() {
  var sumFreight = await _entityManager.OrderSummaries.AsScalarAsync().Sum<OrderSummary, Nullable<Decimal>>(o => o.Freight);
}

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