'DeferRefresh' is not allowed during an AddNew or EditItem transaction.

Question

Hi,

 

I have this exception when using my application. I know more or less where it comes from :

My application uses tabs. I open a tab containing a datagrid. When i double click on a cell, it automatically creates a new object (in the collection binded). However, lets say my cell is still in editing mode. If i open a new tab, and then want to go back in the previous one, I get this error message.

To avoid this problem, I would like my cell to stop editing mode anytime i click somewhere else.

Thanks by advance for your help.

 

Toast.

Answer 1

Any idea / solution ?

Answer 2

Hi Toast,

What is the error message, could you share it? Is it "'DeferRefresh' is not allowed during an AddNew or EditItem transaction"? And it seems a issue of WPF Toolkit DataGrid, Please refer to this link: http://wpf.codeplex.com/WorkItem/View.aspx?WorkItemId=7830 So could you please try to use the latest version of WPF Toolkit or try to code it in the Visua lStudio 2010 with .Net 4(WPF 4 has a DataGrid control)

However, it is hard to find the cause without any code, could you please share some code about your application?

Sincerely, 

Bob Bao

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Answer 3

Hi Toast2,

For your information, I fully documented a similar case in

https://connect.microsoft.com/VisualStudio/feedback/details/532494/wpf-datagrid-and-tabcontrol-deferrefresh-exception

and

https://connect.microsoft.com/VisualStudio/feedback/details/551128/wpf-datagrid-and-tabcontrol-deferrefresh-exception#

When you click on " Bug 551128 : Details/Expand", you can download a documented zip file with all material I could produce for the defer Refresh exception.

If this case matches yours, you can add a vote for 551128 and 532494 (top left)

If your scenario is (even slightly) different, feel free to add your own zip file to 551128 or to open your own DeferRefresh bug entry. This can always help the development/maintenance teams.

Kind regards, Chris.

 

 

 

Answer 4

Hi, I built a workaround for this, which is documented in thread

 

http://social.msdn.microsoft.com/Forums/en/wpf/thread/187b2b8f-d403-4bf3-97ad-7f93b4385cdf

 

It basically gets the datagrid out of edit mode (canceling the pending changes) when it loses focus or changes its DataContext. I don't report the whole solution also in this thread, because it is a bit long, so please visit that link.

 

Cheers,

Emanuele

Answer 5

https://connect.microsoft.com/VisualStudio/feedback/details/532494/wpf-datagrid-and-tabcontrol-deferrefresh-exception

documents the limit of the proposed workaround : the model class must implement 'IEditableObject'

Answer 6

I have the same problem. WPF, Tabs, using IEditableObject but I'm not using DataGrids.

 

Can I safely catch and ignore this exception or will that open up a can of worms?

Answer 7

Hi IngoVals,

If at all possible, you could upload a file attachment with your (simplified) Solution/Project in

https://connect.microsoft.com/VisualStudio/feedback/details/532494/wpf-datagrid-and-tabcontrol-deferrefresh-exception#details (or open an additional connect report)

Your case is quite interesting since you are declaring IEditableObject on your class, a feature that precisely should help avoiding the problem, not cause it.

Thanks, Rhodos

Answer 8

Try following sequence before calling Refersh on CollectionView or <DataGrid>.Items

<DataGrid>.CommitEdit();

<DataGrid>.CancelEdit();

Worked for me.

Answer 9

Thanks for Me 2