DelayedAttribute.UpdateModifiedOnly Property
Gets whether the delayed property stores all or only modified values to a data store.
Namespace: DevExpress.Xpo
Assembly: DevExpress.Xpo.v24.2.dll
NuGet Package: DevExpress.Xpo
#Declaration
#Property Value
Type | Description |
---|---|
Boolean | true if the delayed property’s value is sent to a data store for update only after it has been modified; otherwise, false. |
#Remarks
By default, when a persistent object is saved to a data store, all properties (including delayed properties) send their values for update, regardless of whether or not they have been modified. For delayed properties, you can ensure that only modified property values are saved. To accomplish this, pass true as the delayed attribute’s DelayedAttribute.UpdateModifiedOnly
parameter. After this, the delayed property’s value is saved only if the XPDelayedProperty.IsModified property returns true.
#Example
The following example demonstrates how to delay the loading of the DelayedAttachment property and improve property value update performance, by enabling the DelayedAttribute.UpdateModifiedOnly
property.
Note
This solution uses the XPDelayed
using DevExpress.Xpo;
public class Customer : XPObject {
// ...
private XPDelayedProperty document = new XPDelayedProperty();
// Improve update performance for the property's value
// by passing true as the attribute's
// updateModifiedOnly parameter.
[Delayed(nameof(document), true)]
public Byte[] DelayedAttachment {
get { return (Byte[])document.Value; }
set { document.Value = value; }
}
}