private TDataObj _GetDataObject(EntityObject entity)
{
TDataObj obj = null;
if (_owner.IsStored)
{
// Try to find data object through IWrapDataAccess.
obj = DataObjectHelper.GetDataObject(entity) as TDataObj;
if (obj == null)
{
DataObjectContext ctx = ContextHelper.GetObjectContext(
_entityRef);
obj = DataObjectHelper.GetOrCreateDataObject <TDataObj>(ctx,
entity);
}
}
else
{
obj = DataObjectHelper.GetDataObject(entity) as TDataObj;
if (obj == null)
{
throw new DataException(Properties.Messages.Error_InvalidDataObjectInstance);
}
}
return(obj);
}
private void _CheckCanSave(ObjectStateEntry entry)
{
Debug.Assert(entry != null);
if (entry.State == EntityState.Added)
{
DataObject obj = DataObjectHelper.GetDataObject(entry.Entity as EntityObject);
if (obj != null)
{
if (!obj.CanSave)
{
this.Detach(entry.Entity);
}
}
}
}
///////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////
private void ObjectStateManager_Changed(object sender, CollectionChangeEventArgs e)
{
if (e.Action == CollectionChangeAction.Refresh)
{
_NotifyContextCollectionChanged(e);
}
else
{
if (e.Element != null && e.Element is EntityObject)
{
EntityObject entity = e.Element as EntityObject;
if (entity.EntityState != EntityState.Detached)
{
object obj = DataObjectHelper.GetDataObject(entity);
if (obj != null &&
obj.GetType() == typeof(T)) // NOTE: use exact types comparison, derived types are not accepted
{
_NotifyContextCollectionChanged(e, obj as T);
}
}
}
}
}
private void DataObjectContext_SavingChanges(object sender, EventArgs e)
{
IEnumerable <ObjectStateEntry> entries = this.ObjectStateManager.GetObjectStateEntries(
EntityState.Added |
EntityState.Modified |
EntityState.Deleted);
List <DataObject> addedItems = new List <DataObject>();
List <DataObject> modifiedItems = new List <DataObject>();
List <DataObject> deletedItems = new List <DataObject>();
foreach (ObjectStateEntry entry in entries)
{
if (!entry.IsRelationship &&
entry.EntitySet.ElementType is EntityType)
{
if (entry.State == EntityState.Added ||
entry.State == EntityState.Modified)
{
// apply database constraints
_ApplyConstraints(entry);
// check whether object can be saved
_CheckCanSave(entry);
// fill event collections
if (entry.State != EntityState.Detached)
{
DataObject item = DataObjectHelper.GetDataObject(
entry.Entity as EntityObject);
if (item != null)
{
if (entry.State == EntityState.Added)
{
addedItems.Add(item);
}
else if (entry.State == EntityState.Modified)
{
if (_IsMarkedAsDeleted(item))
{
deletedItems.Add(item);
}
else
{
modifiedItems.Add(item);
}
}
}
}
}
else if (entry.State == EntityState.Deleted)
{
DataObject item = DataObjectHelper.GetDataObject(
entry.Entity as EntityObject);
if (item != null)
{
deletedItems.Add(item);
}
}
}
}
_NotifySavingChanges(addedItems.AsReadOnly(),
modifiedItems.AsReadOnly(),
deletedItems.AsReadOnly());
}