[Solved] RadDataGrid issues

[Chris]

Hi I've recently downloaded the trail version of the RadDataGrid with a view to using it in an app I'm writing.  I understand that it's still in beta but it does appear to be a bit buggy so I thought I would discuss some of the problems I'm experiencing here.

First of all, general navigation of the grid seems ok but there doesn't appear to be anyway of navigating to the top or the bottom of the grid.  I would normally expect ctrl+home and ctrl+end to do this.

I'm using the grid to display a list of around 78,000 rows and 6 columns for each row.  One column displays a text field that can get quite long and will sometimes extends the grid horizontally.  When this happens the horizontal scrollbar appears so the grid can be scrolled.  The problem is that when you scroll the grid the column headers can get out of sync with the rest of the grid.

The next problem I'm experiencing is that I have inline editing turned on but when I double-click a row the row click is suddenly changed which is very confusing. It seems to work fine on the first page but any page after that will fail.  I'm also occasionally getting a 'Object reference not set to an instance of an object.' exception when double clicking a cell.

I'm also concerned because I'm trialling the control to see if it suits my requirements but my trial period will almost certainly have expired by the time these issues are solved and I won't be able to test it with my app.

Kind Regards
Chris.

[Ivaylo Gergov]

Hi Chris,

Thank you for your interest.

At this point, our RadDataGrid does not allow scrolling directly to it's top/bottom through a key combination. I have logged this as a feature request and it will be implemented in our next official release. For now, we have exposed a suitable API that allows to scroll programmatically. More information can be found here - http://www.telerik.com/help/windows-8-xaml/raddatagrid-scrolling.html.

About the issue that arises after horizontal scrolling(the column headers do not render correctly) - it has already been addressed and fixed. It is part of our latest internal build. You can download it through your Account -> Products & Subscriptions -> Latest internal builds.

About the problem that you experience in editing mode, I can confirm that this is a bug and I have logged it in our bug-tracking system. However, I was not able to reproduce the mentioned exception. It would be very helpful If you could prepare a sample project that reproduces it. This exception could also be related to the mentioned above bug.

I have updated your Telerik points as a token of gratitude for your valuable feedback. Also, we have extended your trial period with an additional 1 month. Please, let me know should you have any further questions or suggestions.

Regards,
Ivaylo Gergov
Telerik

[Chris]

Hi Ivaylo,

 

Thanks for your reply.  I have now download the latest version of the control and I can confirm that the column header problem is now fixed.

 

I thought I would give you more information on the 'Object reference not set to an instance of an object.' issue.  I looks like it's related to the editing mode problem as it always happens after this but I will run through the steps to reproduce it:

1. Load the grid with approximately 79000 rows.
2. Scroll to the bottom of the grid using the scrollbar.
3. Double-click a row which causes the editing problem where the row under the mouse pointer changes.
4. Immediately double-click the row under the mouse pointer again - this is when I encounter the 'Object reference not set to an instance of an object.' exception.

Regards
Chris.

[Ivaylo Gergov]

Hello Chris,

Thank you for elaborating on this, but I am still unable to reproduce the exception. I have attached a project that fits the current scenario. Could you please check if the exception still raises on your end, and if not - could you try to modify the project in order to reproduce it?

I am looking forward to your reply.

 

Regards,
Ivaylo Gergov
Telerik