Contains(IEntityScalarQuery,Object,Action<EntityScalarQueryOperation<Boolean>>,Object) Method

Determines whether a sequence contains any elements that match the specified element.

Syntax

Visual Basic
C#

'Declaration
 
<ExtensionAttribute()>
Public Overloads Shared Function Contains( _
   ByVal source As IEntityScalarQuery, _
   ByVal item As Object, _
   ByVal userCallback As Action(Of EntityScalarQueryOperation(Of Boolean)), _
   Optional ByVal userState As Object _
) As EntityScalarQueryOperation(Of Boolean)

'Usage
 
Dim source As IEntityScalarQuery
Dim item As Object
Dim userCallback As Action(Of EntityScalarQueryOperation(Of Boolean))
Dim userState As Object
Dim value As EntityScalarQueryOperation(Of Boolean)
 
value = EntityScalarQueryAsyncExtensions.Contains(source, item, userCallback, userState)

[Extension()]
public static EntityScalarQueryOperation<bool> Contains( 
   IEntityScalarQuery source,
   object item,
   Action<EntityScalarQueryOperation<bool>> userCallback,
   object userState
)

Parameters

source
item
userCallback
userState

Example

public void AsyncAny() {
  var op = _entityManager.Employees.AsScalarAsync().Any();
  op.Completed += (o, e) => {
    bool result = 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