In MVVM should the ViewModel or Model implement INotifyPropertyChanged?

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I read lots of articles and found that INotifyPropertyChanged use in bothes ViewModel and Model as well. So, I am confused about in MVVM should the ViewModel or Model implement INotifyPropertyChanged?

Posted 15-Oct-14 2:27am

manicoder

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[no name] 15-Oct-14 8:34am

It's up to you how you want to do it.

manicoder 15-Oct-14 8:37am

It's means it not mandatory that it must use only in ViewModel. Can you prove me any example or any article or any link from Microsoft.

[no name] 15-Oct-14 8:54am

It means that you can do one or the other or both. There aren't any "rules" that dictate how you will do it. If it makes sense for your project to have your model implement INotifyPropertyChanged then do it in the model. If it doesn't make sense then don't. Personally, I implement it in the VM 99% of the time but that is just me.

manicoder 16-Oct-14 1:33am

Thanks Wes Aday

manicoder 16-Oct-14 1:36am

Thanks Wes Aday

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adityaswami89 · Accepted Answer · 2014-10-15T18:51:00

Solution 1

I would suggest you to implement in both : Model and ViewModel

An example is as below:
MVVM Sample

Posted 15-Oct-14 18:51pm

adityaswami89

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manicoder 16-Oct-14 1:36am

Thanks Aditya