LockingException Class

An exception thrown because an attempt is made to modify a row in a database, but its version doesn’t match the version of the row being posted.

Namespace: DevExpress.Xpo.DB.Exceptions

Assembly: DevExpress.Data.v18.1.dll

Declaration

C#

public class LockingException :
    Exception

VB.NET

Public Class LockingException
    Inherits Exception

Remarks

This exception supports data concurrency in the Optimistic Locking mechanism. It is raised if the row’s data being written back to a database is not consistent with the current data in the database. For instance, a row has been modified by another user/thread after the row’s values were read by the current thread. To learn more about optimistic concurrency, refer to Optimistic Concurrency.

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the LockingException class.

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#

XPO_how-to-generate-a-sequential-number-for-a-business-object-within-a-database-transaction-e2620/CS/ExplicitUnitOfWorkDemo/SequenceGenerator.cs#L35

    euow.FlushChanges();
} catch(LockingException) {
    seq = null;

XPO_how-to-make-user-friendly-object-identifiers-e825/CS/XpoSequencer.cs#L43

}
catch(LockingException) {
    if(attempt >= MaxIdGenerationAttempts)

how-to-bind-scheduler-to-xpo-e4731/CS/Controllers/BaseXpoController.cs#L35

    }
    catch (LockingException) { return false; }
}

how-to-use-xpo-in-aspnet-mvc-application-razor-e3434/CS/Controllers/BaseXpoController.cs#L32

        return true;
    } catch (LockingException) { return false; }
}

VB.NET

XPO_how-to-generate-a-sequential-number-for-a-business-object-within-a-database-transaction-e2620/VB/ExplicitUnitOfWorkDemo/SequenceGenerator.vb#L37

    euow.FlushChanges()
Catch e1 As LockingException
    seq = Nothing

XPO_how-to-make-user-friendly-object-identifiers-e825/VB/XpoSequencer.vb#L48

    End Using
Catch e1 As LockingException
    If attempt >= MaxIdGenerationAttempts Then

how-to-bind-scheduler-to-xpo-e4731/VB/Controllers/BaseXpoController.vb#L40

    Return True
Catch e1 As LockingException
    Return False

how-to-use-xpo-in-aspnet-mvc-application-razor-e3434/VB/Controllers/BaseXpoController.vb#L39

    Return True
Catch e1 As LockingException
    Return False

Inheritance

Object

Exception

LockingException