Question

why RaisePropertyChange is not working inside

public partial class MainWindow : Window
{
        private string _searchString;
        public string SearchString
        {
            get { return _searchString; }
            set
            {
                _searchString = value;
                RaisePropertyChanged(() => SearchPersonEHistroy);
            }
        }
}

It gives error “RaisePropertyChanged’ does not exist in the current context”

but when i tried to use like this:

public partial class MainWindow : Window
{
        public MainWindow()
        {
            InitializeComponent();
            this.DataContext = new MainViewModel();
        }

        public class MainViewModel : NotificationObject
        {
            private string _searchString;
            public string SearchString
            {
                get { return _searchString; }
                set
                {
                    _searchString = value;
                    RaisePropertyChanged(() => SearchPersonEHistroy);
                }
            }
        }

}

what’s the difference between them? or do we have any convertion for RaisePropertyChange inside public partial class MainWindow : Window?

Answer 1

RaisePropertyChanged() is defined by the NotificationObject class, not Window.

Since Window is already a DependencyObject you should make its SearchString property a dependency property which will allow you to bind it with the SearchString property of the View Model.