Session.GetObjectByKey(XPClassInfo, Object, Boolean) Method

Returns the reloaded persistent object with the specified value of the key property from a data store.

Namespace: DevExpress.Xpo

Assembly: DevExpress.Xpo.v23.2.dll

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

NuGet Package: DevExpress.Xpo

Declaration

C#

public object GetObjectByKey(
    XPClassInfo classInfo,
    object id,
    bool alwaysGetFromDataStore
)

VB.NET

Public Function GetObjectByKey(
    classInfo As XPClassInfo,
    id As Object,
    alwaysGetFromDataStore As Boolean
) As Object

Parameters

Name	Type	Description
classInfo	XPClassInfo	An XPClassInfo object which contains the metadata information of the class.
id	Object	An object which represents the key property’s value of the persistent object.
alwaysGetFromDataStore	Boolean	true, to reload the persistent object from storage if it is found in memory; otherwise, false.

Returns

Type	Description
Object	An object which represents the persistent object with the specified value of the key property. Null if no objects are found.

Remarks

Below is an example of using the GetObjectByKey method. Here, session is the Session instance.

C#

using DevExpress.Xpo;
using DevExpress.Xpo.Metadata;
// ...
XPClassInfo personClassInfo = session.GetClassInfo(typeof(Person));
Person personToDelete = (Person)session.GetObjectByKey(personClassInfo, 152, true);
personToDelete.Delete();

VB.NET

Imports DevExpress.Xpo
Imports DevExpress.Xpo.Metadata
' ...
Private personClassInfo As XPClassInfo = session.GetClassInfo(GetType(Person))
Private personToDelete As Person = CType(session.GetObjectByKey(personClassInfo, 152, True), Person)
personToDelete.Delete()

Firstly, the GetObjectByKey method searches in memory for the object with the specified value of the key property. If such an object is found, it is not reloaded. To get the up-to-date object from storage the alwaysGetFromDb parameter must be set to true.

Note

The GetObjectByKey method does not find objects until they are saved to a data store.