Session.GetObjectByKey(Type, Object) Method

Returns the persistent object that has the specified value for its key property.

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(
    Type classType,
    object id
)

VB.NET

Public Function GetObjectByKey(
    classType As Type,
    id As Object
) As Object

Parameters

Name	Type	Description
classType	Type	A Type object which represents the type of objects to search for.
id	Object	An object that represents the persistent object’s key property value.

Returns

Type	Description
Object	An object which represents the persistent object with the specified value for its 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;
// ...
Person personToDelete = (Person)session.GetObjectByKey(typeof(Person), 152);
personToDelete.Delete();

VB.NET

Imports DevExpress.Xpo
' ...
Private personToDelete As Person = CType(session.GetObjectByKey(GetType(Person), 152), Person)
personToDelete.Delete()

Firstly, the GetObjectByKey method searches the memory for the object that has the specified value for its key property. If such an object is found, it is not reloaded. To get the up-to-date object from storage, use the overloaded Session.GetObjectByKey method with the alwaysGetFromDb parameter set to true.

Note

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

Related GitHub Examples

The following code snippet (auto-collected from DevExpress Examples) contains a reference to the GetObjectByKey(Type, Object) method.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

C#

winforms-grid-implement-crud-operations-xpinstantfeedbacksource/CS/DXServermode2/Form1.cs#L124

string key = GetCustomerIDByRowHandle(gridView1.FocusedRowHandle);
customerToEdit = session1.GetObjectByKey(typeof(Customers), key) as Customers;
EditCustomer(customerToEdit, "EditInfo", CloseEditCustomerHandler);

VB.NET

winforms-grid-implement-crud-operations-xpinstantfeedbacksource/VB/DXServermode2/Form1.vb#L111

Dim key As String = GetCustomerIDByRowHandle(gridView1.FocusedRowHandle)
customerToEdit = TryCast(session1.GetObjectByKey(GetType(Customers), key), Customers)
EditCustomer(customerToEdit, "EditInfo", New FormClosingEventHandler(AddressOf CloseEditCustomerHandler))