internal override void OnEditBegun(DataGridItemEventArgs e)
{
object item = e.Item;
DataGridPageManagerBase pageManager = this.RootGroup.GetVirtualPageManager();
if (!pageManager.IsItemDirty(item))
{
// First time we enter edit on this item.
DataGridItemPropertyCollection itemProperties = this.ItemProperties;
int count = itemProperties.Count;
string[] propertyNames = new string[count];
object[] cachedValues = new object[count];
for (int i = 0; i < count; i++)
{
DataGridItemPropertyBase itemProperty = itemProperties[i];
propertyNames[i] = itemProperty.Name;
cachedValues[i] = itemProperty.GetValue(item);
}
// Cache the values of the never edited before row. This will help the developer find the corresponding row
// in the source when times comes to commit the changes to the data source.
pageManager.SetCachedValuesForItem(item, propertyNames, cachedValues);
}
base.OnEditBegun(e);
}