如何使用 MVVM 架构在 WPF 中实现简单的树数据结构？

Question

New to MVVM architecture; I've been looking at this article but I'm not sure what pieces of code belong in model or viewmodel. Can someone show me how its done? Also, does every model need a raisepropertychanged() function?

Thank you for your answers in advance!

Answer 1

Somewhat general answer here but:

Viewmodels should contain the information needed for the associated view and handle view interaction with the model. This includes data to fill things like textboxes and functions that determine what to do when a button is pressed (a command).

The model is everything not directly connected to a view. This might be custom data types or classes for interacting with a database.

The model should not have a raisepropertychange() function - more accurately it should not implement the INotifyPropertyChanged interface. Every viewmodel should implement INotifyPropertyChanged, the easiest way to do this is generally to have a base viewmodel class that all of your viewmodels inherit from which implements the interface.

Here is a good example of the INotifyProperty implementation. , I personally use the last option under the C#7 heading in my viewmodel base class and call the SetField() function from each property.

Answer 2

If you REALLY want to learn MVVM from scratch, try this article (3 parts) . From here you will get the big picture . There is explained what is a model, what is a view model, what is a view.