In MVVM Pattern INotifyPropertyChanged can use only in ViewModel or we can use in Model or Bothes?

Question

I read lots of articles, And found that lots of people use INotifyPropertyChanged in ViewModel either Model as well. So, I am confused about INotifyPropertyChanged where to use.

possible duplicate of [In MVVM should the ViewModel or Model implement INotifyPropertyChanged?](http://stackoverflow.com/questions/772214/in-mvvm-should-the-viewmodel-or-model-implement-inotifypropertychanged) — C Bauer, Oct 15 '14 at 11:56

score 0 · Answer 1 · answered Oct 21 '14 at 10:53

A popular approach is to use a base class which Implements InotifyPropertyChanged interface and then inherit this base class in your View Model.

example:

    public class NotifyPropertyBase : INotifyPropertyChanged
    {
      public event PropertyChangedEventHandler PropertyChanged;

      public void OnPropertyChanged(string propertyName)
      {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

Then inherit the base class in the view model:

class MainViewModel : NotifyPropertyBase

Finally, raise the OnPropertyChanged event in the property setter of your view model passing in the property name string as the parameter:

  private string _name;
    public string Name
    {
        get { return _name; }
        set
        {
            _name= value;
            OnPropertyChanged("Name");
        }
    }

Now your UI should update at run time provided the binding is declared correctly in the Xaml.

In MVVM Pattern INotifyPropertyChanged can use only in ViewModel or we can use in Model or Bothes?

1 Answers1