Average<TSource,TResult>(IEntityScalarQuery<TSource>,Expression<Func<TSource,TResult>>,Action<EntityScalarQueryOperation<TResult>>,Object) Method

Computes the average of a 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 Average
    (Of TSource,TResult)( _
   ByVal source As IEntityScalarQuery(Of TSource), _
   ByVal projection As Expression(Of Func(Of TSource,TResult)), _
   ByVal userCallback As Action(Of EntityScalarQueryOperation(Of TResult)), _
   Optional ByVal userState As Object _
) As EntityScalarQueryOperation(Of TResult)

'Usage
 
Dim source As IEntityScalarQuery(Of TSource)
Dim projection As Expression(Of Func(Of TSource,TResult))
Dim userCallback As Action(Of EntityScalarQueryOperation(Of TResult))
Dim userState As Object
Dim value As EntityScalarQueryOperation(Of TResult)
 
value = EntityScalarQueryAsyncExtensions.Average(Of TSource, TResult)(source, projection, userCallback, userState)

[Extension()]
public static EntityScalarQueryOperation<TResult> Average<TSource,TResult>( 
   IEntityScalarQuery<TSource> source,
   Expression<Func<TSource,TResult>> projection,
   Action<EntityScalarQueryOperation<TResult>> userCallback,
   object userState
)

Parameters

source
projection
userCallback
userState

Type Parameters

TSource
TResult

Example

public void AsyncAverageWithPredicate() {
   var op = _entityManager.OrderSummaries.AsScalarAsync().Average<OrderSummary, Nullable<Decimal>>(o => o.Freight);
   op.Completed += (o, e) => {
     var ct = e.Result;
   };
 }

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

EntityScalarQueryAsyncExtensions Class
EntityScalarQueryAsyncExtensions Members
Overload List