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Can a single view be associated with multiple viewmodels?
In this case, my Team View would be associated with a single Team ViewModel as well as any number of Player ViewModels (in the Team collection). Does having multiple ViewModels associated with a single View violate any design guidelines for MVVM , and is there a preferred way of implementing this scenario? Thanks!
Which is easier to maintain MVM or MVM per view?
The Model-oriented View Model (MVM), while low in code duplication, is a nightmare to maintain The View-oriented View Model (VVM) produces highly-specialised classes for each view, but contains duplicates. In the end, I decided that having one VM per View is easier to maintain and code for, so I went with the VVM approach.
When to create a view model in WPF?
You should only create a view model if there is something view-specific about what you are doing. If all you are doing is binding to data and invoking commands which naturally belong on your model, there is no reason to create a view model. Your Player object has a Name property, a Rank property, a Promote () method, and a Delete () method.
How to keep things in sync between viewmodels?
To keep things in sync between ViewModels, use either events, or have properties to each other between ViewModels. Sync between Views and ViewModels should be standard notifying properties. Highly active question. Earn 10 reputation (not counting the association bonus) in order to answer this question.
When do you need to use a view model?
A view model is only really necessary when view-specific state needs to be tracked (such as “current Player”), conversions are too complex to be handled by simple binding, or you need commands that affect several different model objects and/or view model properties at the same time.
Can a view bind to a view model?
Your view is a simple one that allows you to edit the Name and Rank of any player, and also has buttons to promote and delete players. In this case adding a view model between your view and your model is pointless. Such a view can bind directly to the model:
How many views can I access in MVVM?
The MVVM Light toolkit will do what you want. The ViewModel Locator that Laurent uses in his samples will do the trick! Please Sign up or sign in to vote. you can access the same view-model in many pages. The content must be between 30 and 50000 characters.