common-viewmodelbase-class.md

title	page_title	description	slug	tags	published	position
ViewModelBase	ViewModelBase Class	This article provides information about the ViewModelBase class.	common-viewmodelbase-class	ViewModelBase	true	5

ViewModelBase class

The ViewModelBase abstract class is designed to serve as a base class for all the model classes in your application. It provides support for property change notifications. Instead of implementing the INotifyPropertyChanged interface in each individual view model, you can directly inherit ViewModelBase.

[C#] Example 1: Custom ViewModel that inherits the abstract ViewModelBase class

{{region common-viewmodelbase-class-0}} using Telerik.Windows.Controls; public class MyViewModel : ViewModelBase { private object selectedItem; public object SelectedItem { get { return this.selectedItem; } set { if (value != this.selectedItem) { this.selectedItem = value; OnPropertyChanged(() => this.SelectedItem); } } }

    private ObservableCollection<Club> clubsCollection;
    public ObservableCollection<Club> ClubsCollection
    {
        get
        {
            return this.clubsCollection;
        }
        set
        {
            this.clubsCollection = value;
            this.OnPropertyChanged("ClubsCollection");
        }
    }
}

{{endregion}}

As shown in the previous example the OnPropertyChanged method gives a couple of overloads that can be used.

The ViewModelBase class supports an additional approach for notifying the property change, via the the CallerMemberName attribute which is implemented in the RaisePropertyChanged method.

[C#] Example 2: Using the CallerMemberName attribute:

{{region common-viewmodelbase-class-1}} public object SelectedItem { get { return this.selectedItem; } set { if (value != this.selectedItem) { this.selectedItem = value; RaisePropertyChanged(); } } } {{endregion}}

See Also

• [EventToCommandBehavior]({%slug common-event-to-command-behavior%})
• [Attached Behavior]({%slug common-mvvm-attached-behavior%})
• [DelegateCommand]({%slug common-mvvm-delegate-command-implementation%})