mvvm - Prism 6 and constructor calling -


based video brian lagunas (youtube link) started using prism 6. little bit confused, constructor of mainwindowviewmodel getting called. copied project , can't find part. if set break point in constructor, never gets there.

was no showing in video or something?

if have @ code presentation, can see brian using prism's attached dependency property couple view , viewmodel through viewmodellocator.

prism:viewmodellocator.autowireviewmodel="true"

in video around 33:00 gives full explanation how viewmodellocator works: first builds viewmodel name out of view's name through convention. either resolves name type through ioc container or reflection. ioc pretty straight forward: give type or name , give instance. reflection part (when run without container), prism uses activator type create new instance.

in final code available on github, brian using unity ioc container. custom mappings sub-views (viewa/viewb) made in bootstrapper. there no custom mapping mainviewmodel, following process happens:

  • the app starts mainwindow startup window.
  • the attached property viewmodellocator gets 'triggered', internal logic map mainwindow mainwindowviewmodel
  • as we're using unity, viewmodellocator asks instance of viewmodel
  • unity create new mainwindowviewmodel object , constructor hit

so won't see new xxxviewmodel() in code, created. means have greater flexibility on hardcoded object creation when comes down adding dependencies.


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