CODEWITHSUNDEEP
wpfmvvmprismmef
VladacusB
VladacusB

Reputation: 844

Prism and MVVM databinding from modules to main shell datacontext

Have some experience with WPF and databinding, but completely new to PRISM and MVVM.

I'm working on Prism application where I have a shell and multiple modules.

In my previous WPF application I had a single window datacontext (with all objects I need) which I could then simply databind from any usercontrol inside my window.

In the context of the Prism, what is the proper way to have a single datacontext, let's we call it ShellViewModel and then for all modules to bind to its' objects and properties? So if there is a change in one property in ShellViewModel which is caused by one module, another module can detected that by databinding and then maybe trigger a style?

Probably there is a simple way to do this but I'm new to PRISM and MVVM and completely confused how we can do properly bindings especially when there are multiple modules involved?

Also any source code and examples would be great.

Upvotes: 0

Views: 756

Answers (1)

Haukinger
Haukinger

Reputation: 10863

If you have a single source of data, make it available to all your view models as a service.

Register it as a singleton, so that all view models get the same instance. If you need the service to push updates to the view models, make it implement INotifyPropertyChanged and let the view models observe that (done best through a PropertyObserver).

Remember that the view model is the data context of the view, and that it should only communicate data and events between the view and the data source a.k.a. model, but should not own data itself.

Upvotes: 1

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