2. 9. PropertyChanged is used to notify the UI that something has been changed in the Model. Since you're changing an inner property of the User object - the User property itself is not changed and therefore the PropertyChanged event isn't raised..
Hereof, what is the use of INotifyPropertyChanged in WPF?
INotifyPropertyChanged interface is used to notify the view or ViewModel that it does not matter which property is binding; it is updated. Let's take an example for understanding this interface. Take one WPF Window in which there are a total of three fields: First Name, Last Name and Full Name.
Secondly, what is OnPropertyChanged? INotifyPropertyChanged is an interface member in System. ComponentModel Namespace. This interface is used to notify the Control that the property value has changed.
Considering this, what is Updateourcetrigger WPF?
UpdateSourceTrigger. This is a property on a binding that controls the data flow from a target to a source and used for two-way databinding. The default mode is when the focus changes but there are many other options available, that we will see in this article.
How do you implement INotifyPropertyChanged?
To implement INotifyPropertyChanged you need to declare the PropertyChanged event and create the OnPropertyChanged method. Then for each property you want change notifications for, you call OnPropertyChanged whenever the property is updated.
Related Question Answers
What is ObservableCollection in C#?
An ObservableCollection is a dynamic collection of objects of a given type. Objects can be added, removed or be updated with an automatic notification of actions. When an object is added to or removed from an observable collection, the UI is automatically updated.What is dependency property in WPF?
In WPF applications, dependency property is a specific type of property which extends the CLR property. It takes the advantage of specific functionalities available in the WPF property system. A class which defines a dependency property must be inherited from the DependencyObject class.What is WPF ICommand?
ICommand in Windows Runtime apps The ICommand interface is the code contract for commands that are written in . NET for Windows Runtime apps. These commands provide the commanding behavior for UI elements such as a Windows Runtime XAML Button and in particular an AppBarButton .What is Inotifypropertychanged xamarin?
Binding, in the most common context, is the process of mapping a property on a Page, to a property in a ViewModel. In Xamarin Forms terms, the Page is a BindableObject and the BindableObject has a BindingContext, which would be the ViewModel.Does ObservableCollection implement INotifyPropertyChanged?
ObservableCollection cannot simply detect changes in the objects it contains and pass those along on your behalf. The reason the collection implements INotifyPropertyChanged isn't particularly useful. But if your UI is binding to properties of the object, you'll need to implement it if you want the UI to react. 
