在SimpleXML和XPath中设置父节点变量(Setting Parent Node Variable in SimpleXML and XPath)

 诀窍是在其他地方初始化UsrNotesText。 
 
 您可以使用PXDefault属性： 
 
[PXDefault(typeof(Search<SOOrderExtension.usrNotesText, Where< [...] >>))]
 
 或FieldDefaulting事件处理程序： 
 
public void SOShipment_UsrNotesText_FieldDefaulting(PXCache sender, PXFieldDefaultingEventArgs e)
{
   e.NewValue = [...]
}
 
 有时，当用户更改不重新触发默认设置的关键字段时，您还想重新初始化： 
 
public void SOShipment_ShipmentNbr_FieldUpdated(PXCache sender, PXFieldDefaultingEventArgs e)
{
    SOShipment shipment = e.Row as SOShipment;

    if (shipment != null)
    {
        SOShipmentExtension shipmentExt = PXCache<SOShipment>.GetExtension<SOShipmentExtension>(shipment);

        if (shipmentExt != null)
        {
            shipmentExt.UsrNotesText = [...];
        }
    }
}
 
 在这种情况下，使用RaiseFieldDefaulting手动重新触发FieldDefaulting事件通常是更好的选择。 
 
 但是，您选择初始化的方法可以避免在RowSelected中设置字段值，因为在您不想初始化自定义字段时会调用该事件。 

The trick is to initialize UsrNotesText elsewhere.
 
You can use PXDefault attribute:
 
[PXDefault(typeof(Search<SOOrderExtension.usrNotesText, Where< [...] >>))]
 
Or FieldDefaulting event handler:
 
public void SOShipment_UsrNotesText_FieldDefaulting(PXCache sender, PXFieldDefaultingEventArgs e)
{
   e.NewValue = [...]
}
 
Sometimes you also want to re-initialize when user changes key fields that are not re-triggering the default.:
 
public void SOShipment_ShipmentNbr_FieldUpdated(PXCache sender, PXFieldDefaultingEventArgs e)
{
    SOShipment shipment = e.Row as SOShipment;

    if (shipment != null)
    {
        SOShipmentExtension shipmentExt = PXCache<SOShipment>.GetExtension<SOShipmentExtension>(shipment);

        if (shipmentExt != null)
        {
            shipmentExt.UsrNotesText = [...];
        }
    }
}
 
In such case manually re-triggering FieldDefaulting event with RaiseFieldDefaulting is often a better option.
 
However method you choose to initialize avoid setting the field value in RowSelected because that event is called at times when you don't want to initialize the custom field.