SessionObjectLayer.SelectDataAsync(Session, ObjectsQuery, CriteriaOperatorCollection, CriteriaOperatorCollection, CriteriaOperator, AsyncSelectDataCallback) Method

Performs object layer specific operations that are required to asynchronously retrieve object data from a session using specified query parameters and notifies upon completion.

Namespace: DevExpress.Xpo

Assembly: DevExpress.Xpo.v24.1.dll

NuGet Packages: DevExpress.Win.PivotGrid, DevExpress.Win.TreeMap, DevExpress.Xpo

NuGet Package: DevExpress.Xpo

Declaration

C#

public object SelectDataAsync(
    Session session,
    ObjectsQuery query,
    CriteriaOperatorCollection properties,
    CriteriaOperatorCollection groupProperties,
    CriteriaOperator groupCriteria,
    AsyncSelectDataCallback callback
)

VB.NET

Public Function SelectDataAsync(
    session As Session,
    query As ObjectsQuery,
    properties As CriteriaOperatorCollection,
    groupProperties As CriteriaOperatorCollection,
    groupCriteria As CriteriaOperator,
    callback As AsyncSelectDataCallback
) As Object

Parameters

Name	Type	Description
session	Session	A Session that is used to retrieve persistent objects.
query	ObjectsQuery	An ObjectsQuery object specifying a query that is executed to retrieve persistent objects.
properties	CriteriaOperatorCollection	A CriteriaOperatorCollection object which specifies object properties to be retrieved.
groupProperties	CriteriaOperatorCollection	A CriteriaOperatorCollection object which specifies the grouping properties.
groupCriteria	CriteriaOperator	A CriteriaOperator descendant which specifies the grouping criteria for the retrieved objects.
callback	AsyncSelectDataCallback	An AsyncLoadObjectsCallback delegate to be called after the object data have been retrieved. Use the callback to store the exception information passed as a parameter, and use this information later, to raise the exception again, within the original thread. Do not raise exceptions or modify persistent objects within a callback.

Returns

Type	Description
Object	An object identifying the current asynchronous operation, intended for internal use.

Implements

SelectDataAsync(Session, ObjectsQuery, CriteriaOperatorCollection, CriteriaOperatorCollection, CriteriaOperator, AsyncSelectDataCallback)