wpf - 'DeferRefresh' is not allowed during an AddNew or EditItem transaction

Question

I have a tab control in the GUI and there is WPF 4.0 datagrid in one of the tabs. When I click on a cell in the grid and edit something and then switch tabs, I get a Defer Refresh error:

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

So I call datagrid.CancelEdit(DataGridEditingUnit.Row) when tab is switched to cancel any pending edit and the Defer refresh issue is gone.

But what I really want to do is CommitEdit() so that the user doesn't have to reenter the data again.

And datagrid.CommitEdit(DataGridEditingUnit.Row, true) doesn't work for me. I get the below error on CommitEnd():

Cannot perform this operation while dispatcher processing is suspended.

PS: I have tried datagrid.CommitEdit() and datagrid.CommitEdit(DataGridEditingUnit.Column, true) and it didnt work.

Answer 1

I solved this by adding this handler for the DataGrid's Unloaded event:

    void DataGrid_Unloaded(object sender, RoutedEventArgs e)
    {
        var grid = (DataGrid)sender;
        grid.CommitEdit(DataGridEditingUnit.Row, true);
    }