Prevent Drag and drop between multiple RadGridView

[Navaneeth]

Hello,

I have two RadGridView both allows Drag & Drop of rows. We use the method explained in the article http://www.telerik.com/help/silverlight/raddraganddrop-within-radgridview.html. Since both the grids allows drag & drop, user can drag from one grid and drop on the other. This will fail as the backing datacontext for both grids are different and the type conversion fails.

I am looking for a method where the grid won't allow dropping on to the other droppable grids. Is there a way to achieve this?

Any help would be appreciated. 

[Tsvyatko]

Hello Navaneeth,

you can check whether the e.Options.Payload is the correct type for the destination grid in DropQuery event and if not set e.QueryResult = false;

Best wishes,
Tsvyatko
the Telerik team

[Navaneeth]

Thanks and that seems to do the trick. BTW, we have another issue with the drag & drop approach. Drag & drop on a grid with more number of rows seems to be very slow. We tried it on a grid which has 70+ rows and it took around 10 seconds to drop just one row. Is there any way to fix this too?

Thanks for your help.

[Tsvyatko]

Hello Navaneeth,

I suspect this could be either due to slow remove/insert operations or RowVirtualization turned off.

I can suggest the following:

 - try perform row reorder from button to eliminate drag/drop element.
 - check whether  the grid is not placed within StackPanel or RowVirtualization turned off, which could cause measuring of all rows.

Regards,
Tsvyatko
the Telerik team

[Navaneeth]

Thanks again for the reply. GridView has row virtualization turned on (EnableRowVirtualization="True") and it is not contained in a StackPanel. We are still facing the slowness in Drag & Drop. Is there any other property that controls the virtualization or performance of the row reorder? 

[Milan]

Hello Navaneeth,

Have you tried to execute the row reorder logic without using drag and drop as my colleague has suggested?

Regards,
Milan
the Telerik team

[Tsvyatko]

Hi Navaneeth,

Unfortunately, we are unable suggest solution without some additional information about the specific scenario.
Could you please, open a support ticket and attach sample project that demonstrate the problem.

Kind regards,
Tsvyatko
the Telerik team