Question

public ObservableCollection<App> Apps { get; set; }

public MainWindow()
{
    Apps = LoadApps();
    listview.ItemsSource = Apps;
}

public void AnotherMethod()
{
    Apps = LoadApps();
}

It works when assigned to ItemsSource but I need the ListView to be updated every time the Apps content is changed.

Answer 1

What do you mean by “Apps content”? If you replace the whole reference with a new collection you need to implement INotifyPropertyChanged in MainWindow. If the items change internally and you want updates in the ListView you need to implement said interface in App.

(Note about the first possibility: Often you would not allow the replacement of the reference by creating a private readonly field, obviously the public property exposing it would only have a getter.)