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

C#

    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");
            }
        }
    }

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:

C#

        public object SelectedItem
        {
            get { return this.selectedItem; }
            set
            {
                if (value != this.selectedItem)
                {
                    this.selectedItem = value;
                    RaisePropertyChanged();
                }
            }
        }

See Also

• EventToCommandBehavior
• Attached Behavior
• DelegateCommand