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There is a bug in the RadGridView when using built in filters.
If I filter a grid by a value that returns a single row, the row is visibly selected but and I get a System.NullReferenceException, if I try to get a cell value when the SelectionChanged event is fired. When I handle the exception, and I then click on the row, it does not fire the SelectionChanged event.
I have to set .CurrentRow = Nothing on FilterChanged in order to click on and select the row, which will then fire the SelectChanged event and I get the value expected.
Here is my relevant code to reproduce the issue;
Private Sub RadGridViewFullBadge_SelectionChanged(sender As Object, e As EventArgs) Handles RadGridViewFullBadge.SelectionChanged
'This If Statement is Required or I get a System.NullReferenceException after the filter is applied
If RadGridViewFullBadge.CurrentRow IsNot Nothing Then
RadTextBoxControlTestBadge.Text = RadGridViewFullBadge.CurrentRow.Cells("BadgeID").Value
End If
End Sub
Private Sub RadGridViewFullBadge_FilterChanged(sender As Object, e As GridViewCollectionChangedEventArgs) Handles RadGridViewFullBadge.FilterChanged
RadGridViewFullBadge.CurrentRow = Nothing
End Sub
James
1 Answer, 1 is accepted
Following the provided code snippet, I have prepared a sample project to test the behavior on my end. Setting the CurrentRow to null in the FilterChanged event actually closes the editor after each key pressed if you intend to type several letters in the filter cell. I would like to note that there is a difference between a selected and a current row. More information can be found here:
https://docs.telerik.com/devtools/winforms/controls/gridview/rows/selected-rows-and-current-row
You may have multiple rows selected, but only a single row can be current. That is why accessing a cell value by using the CurrentRow in the SelectionChanged event, is expected to ensure that the CurrentRow is not null. Hence, the null check is fine.
I have attached my sample project for your reference. Could you please specify the exact steps how to reproduce the problem? Do I need to perform any changes in the code to reproduce the experienced issue? Thank you in advance.
I am looking forward to your reply.Regards,
Dess | Tech Support Engineer, Principal
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Add to RadForm1_OnLoad
Me.RadGridView1.ShowFilteringRow = False
Me.RadGridView1.ShowHeaderCellButtons = True
Remove the RadGridView1_FilterChanged event'
Run the program.
Filter the ProductName column for "Aniseed Syrup", and you will see that Me.Text does not change when the filter is applied. If you click on the row Me.Text does not change.
This seems like a bug to me.
Hello, James,
I have made the described modifications in my sample project and tracked the program's execution when filtering by using the Excel-like filter popup. The appropriate event here is the CurrentRowChanged event which is fired after the FilterExpression is successfully applied and the rows in RadGridView are filtered.
Private Sub RadGridView1_CurrentRowChanged(sender As Object, e As CurrentRowChangedEventArgs)
If RadGridView1.CurrentRow IsNot Nothing Then
Me.Text = RadGridView1.CurrentRow.Cells("ProductName").Value
End If
End Sub