public async override Task <bool> SaveChangesAsync(CancellationToken tkn = default(CancellationToken))
{
foreach (var item in NewUnsavedItems)
{
try { if (!await AddItem(item, tkn))
{
return(false);
}
}
catch (Exception ex)
{ return(LogError($"AddItem: [nid:{item?.nid}] «{item?.title}»", ex)); }
}
NewUnsavedItems.Clear();
foreach (var item in ChangedUnsavedItems)
{
try { if (!await UpdateItem(item, tkn))
{
return(false);
}
}
catch (Exception ex)
{ return(LogError($"UpdateItem: [nid:{item?.nid}] «{item?.title}»", ex)); }
}
ChangedUnsavedItems.Clear();
return(true);
}
protected void StartTrackingChanges()
{
foreach (var item in _list)
{
item.PropertyChanged += (s, e) =>
{
if (!ChangedUnsavedItems.Has(x => x.nid == item.nid))
{
ChangedUnsavedItems.Add(item);
}
};
}
}
