Forums | NoesisGUI

I have a view where many component items (UserControls) are displayed using an ItemsControl. The DataTemplate references a UserControl I define in another xaml file. I'm finding that for every single item, it wants to reload the xaml over and over, which I assume also means parsing it over and over which is quite expensive. Is there a way to load and parse it just once other than copying the xaml into the main view?

Only thing I can think of right now is definining it in a resource file instead somehow.. Is that the best way?

Hi, this is something that has been asked a few times and we have plans to address this problem: #1301. The idea is storing in a cache the internal parsing of the XAML, then each time a new UserControl is requested we only have to instantiate that internal tree. That should be a lot faster than loading the XAML from the file system and parsing it every time.

In the meantime, does your user control have any code behind? If it is only a xaml encapsulating a bunch of controls then you can define a control template instead:

Yep that worked, thanks!

Hi,
We also has this situation, but our user control has code behind. How should we optimize it?

We also has this situation, but our user control has code behind. How should we optimize it?

Hi, if you cannot move the UserControl code to a view model, so you can convert it to a simple control template there is not much you can do now.
But loading and parsing a UserControl xaml shouldn't cost a lot, unless it is huge or it is loading lots of other resource dictionary xamls. Is that your case?