When pages get cached all the widgets on them are cached too. The problem here is that this caching can cause user confusion. When a widget is cached its nodes are cached and some of them could still be visible even if you log out, or some of the menu nodes could be hidden even if you are authenticated. This case should sound familiar to you if you have read the documentation in detail or used the Navigation controls in some of the described scenarios.
This issue is solved elegantly in the WebForms Navigation by exposing OutputCache settings – VaryByAuthenticationStatus and VaryByUserRoles. When one of those two settings is set, the Navigation's cache is invalidated when a user logs in or there is a change in the user's role. Unfortunately, the MVC Navigation does not offer those settings, so for MVC this case requires different solutions.
There are three immediate solutions:
The third solution will provide you with the most flexibility. It might seem like the hardest, but let’s take a look at how we can put that together with just a few lines of code.
We don't have to come up with a complex implementation. To start, just look at the code of the WebForms Navigation control and see how the output cache mechanism works there. Use JustDecompile and open Telerik.Sitefinity.dll assembly and look for the LightNavigationControl control and for the CreateChildControl method. Those four lines of code are doing the magic:
Here is how the MVC Navigation controller looks if we add the full implementation of those four lines of code and implement the dependencies:
The last step will be to create the views and the widget designers – but this is effortless since you can simply copy and paste those files from the default implementation of the widget. Keep in mind that the above solution is tested with the 10.1 version. If you want to use a different version, you must copy and paste the views and designers corresponding to the version that you are using.
With Sitefinity 10.2 the above implementation will come out of the box and you can remove the custom code. Although the solution is coming to the latest version soon, for those of you using an older version this solution will continue to work. Happy coding!
Peter Filipov (Pepi) is a Product Manager focused on expanding Sitefinity ecosystem. His prior experience as a Developer Advocate and Manager of Engineering helps him to understand the customers’ and market needs of Sitefinity. He also is passionate about being active and healthy 24/7 😊.
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