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DataGrid Referesh not working "'Refresh' is not allowed during an AddNew or EditItem transaction."

Answered DataGrid Referesh not working "'Refresh' is not allowed during an AddNew or EditItem transaction."

  • Monday, August 20, 2012 7:00 PM
     
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    Hi,

    I have tried every solution available on internet for this problem but to no avail. I'll be really grateful for help. 

    My datagrid has only one column. I have created a CollectionViewSource in xaml  as a resource which is bound to codebehind observablecollection of my data. I am then setting this CollectionViewSource as StaticResource to ItemsSource of datagrid and to CurrentCollection of Validation rule. I am then using this CurrentCollection of Validation rule in code behind of ValidationRule to check for uniqueness.

    When I delete a row I need to refresh DataGrid to update row numbers and to remove/re-evaluate validation errors if any. But I get this error when I refresh the DataGrid in code behind.

    I also tried resetting ItemsSource as follows. It refreshes the grid but then breaks at the routine which I was using to re-validate the grid forcefully. 

                  
    // 1. refresh the grid 
     myDatagrid.ItemsSource = null;                
Binding myBinding = new Binding();  

myBinding.Source = this.FindResource("MyCollectionViewSource");

myDataGrid.SetBinding(DataGrid.ItemsSourceProperty, myBinding);

    Here is the routine in my class drived from datagrid for validating forcefully.

    public void ForceValidation(Object obj)        
{            
   if (obj == null)                
     return;            
   DataGridRow row =                               (DataGridRow)this.ItemContainerGenerator.ContainerFromItem(obj);
   // row always is null after ItemsSource is reset but don't know why ...
   if (row == null || row.BindingGroup == null)                  
     return;            
   row.BindingGroup.UpdateSources();            

   HasError = Validation.GetHasError(row);
}

    I am calling this in a foreach loop like this:

    // 2. re-evaluate validation errors.
    foreach (dataObjects msg in ListofMyDataObjects)                
  myDataGrid.ForceValidation(msg);

    Looking forward to any help.

    Thanks.

    Dami.




    • Edited by Dami Monday, August 20, 2012 8:03 PM
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