CODEWITHSUNDEEP
c#wpfmvvm
FPGA
FPGA

Reputation: 3875

reference the same instance of a view model into multiple view models

i have an instance of a view model and 3 other view models, each of those three view models need to access the ObservableCollection of that view model, that view model is not my main view model, should i send the instance of that view model by reference to the constructor of other view models and add it as a property?

Upvotes: 0

Views: 823

Answers (1)

Noctis
Noctis

Reputation: 11783

Sounds like it shouldn't be there to begin with (if 3 other ViewModels need it to).

You could reference the ViewModel, or better yet, move that collection to your Model, or to a global resource.

Edit:

If you're not using any frameworks, you might have to jump through loops to do it, or pass references in the constructors. Have a look at these answers: similar question , another similar one .

I still believe you should just move it out of the ViewModel to a different place, since the ViewModel is basically a translator from your Model, to your View. If your collection is shared by different ViewModels, it should be in a shared location.

If you would have used Mvvm-Light, the Locator might have been useful, or another option would have been to use the messenger maybe, even though I wouldn't have done it that way...

Upvotes: 1

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