.NET Framework 4.5.2+
.NET Framework 4.5.2+
.NET Standard 2.0+

XPObject Class

Implements the IXPObject and provides an autogenerated integer key mapped to the ‘OID’ field.

Namespace: DevExpress.Xpo

Assembly: DevExpress.Xpo.v21.2.dll

Declaration

[NonPersistent]
[MemberDesignTimeVisibility(false)]
public abstract class XPObject :
    XPCustomObject

Remarks

Persistent objects are the objects that can be saved to and restored from a data store. Persistent objects represent the records in a table and encapsulate all the required relationships. The field values are represented as properties. Therefore a data table is merely represented by a collection of persistent objects. With eXpress Persistent Objects you will never have to deal with table mapping - all you need to do is to define persistent object classes, and XPO will automatically generate a database for them.

When creating a persistent object by deriving from the XPBaseObject, XPCustomObject or XPObject class, an OptimisticLockingAttribute is automatically applied to it. This attribute specifies whether a session can lock a persistent object’s state (allows optimistic locking to be enabled).

For more information, Optimistic Concurrency.

The following code demonstrates how to declare a persistent object.

using DevExpress.Xpo;

// Other base classes: https://docs.devexpress.com/eXpressAppFramework/113146/concepts/business-model-design/business-model-design-with-xpo/base-persistent-classes

public class MyClass : XPObject {
    // XPObject has a built-in Integer key and you can't add a custom key
    public MyClass(Session session) : base(session) { }
    string fMyProperty;
    public string MyProperty {
        get { return fMyProperty; }
        set { SetPropertyValue(nameof(fMyProperty), ref fMyProperty, value); }
    }
}

Concepts

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See Also