Limit number of filter descriptors

[ianr]

Hi,

Is there a way to limit the number of filters that can be added using the control?  I am using the RadDataFilter with the CanUserCreateCompositeFilters set to false, so there will be no nested queries.

If for example, I wanted to only allow up to 4 query conditions to be set, how would I enforce this?  I have looked for a property to set an upper limit, but have not found one.

I have also attempted to enforce this through event handlers in the code-behind.  E.g:

Handle the filter controls FilterDescriptors.CollectionChanging event.  In this event handler, if the count has reached the limit, then set e.Cancelled to true.  This behaves a little strangely because once the limit has been reached, it does in fact stop descriptors being added by cancelling the event (and this can be verified by looking at the control's data in the debugger - the collection count never goes above 4), but the control in the view continually draws new descriptors.  It allows you to edit the values of the descriptors and so on, but the query that is executed ignores them.  So - I seem to have successfully stopped them being added, but they are still drawn.

Is this behaviour expected, and is there a way to enforce a limit?

Thanks.

[Rossen Hristov]

Hello ianr,

Currently there is no way to limit the amount of filters. Cancelling the collection changing is definitely not the way to go. It is not there for that purpose. Please, do not use it in this way.

I have logged your feature request in our PITS system. Please, vote for it in order to elevate its priority. I hope that I will be able to provide this feature soon.

Thank you for your great suggestion. RadDataFilter is still a young control and we want to shape it according to our customers' suggestions.

All the best,
Ross
the Telerik team

[ianr]

Thanks for the reply.  I have voted for this feature, but I noticed that it had been added to PITS for silverlight, while I am using the WPF version.

Regards.

[Rossen Hristov]

Hi ianr,

I am sorry. They are mirrored since we share the same code-base for the two platforms and therefore develop features for both. Here is the link for its WPF counterpart.

Regards,
Ross
the Telerik team

[Shankar]

Hi Ross,

Is this feature supported in the new version of Telerik? Please let me know

[Yordanka]

Hi Shankar,

Unfortunately, this feature is not available with the current implementation of RadDataFilter.
 
Kind regards,
Yordanka
the Telerik team

[Thomas]

Hi, is there any chance this has been implemented since the last post in 2012? Thanks!

[Stefan]

Hello,

By the time being, such feature is not supported out-of-the-box by RadDataFilter. I, however, prepared a sample application demonstrating how such customization can be achieved. I hope it suits your needs. Please, bear in mind, that this is a custom implementation aiming to satisfy this particular requirement. I cannot ensure that it will work as expected in all scenarios (when the CanUserCreateCompositeFilters property is not set to False, for example).

All the best,
Stefan X1
Telerik by Progress