namespace LBI.DataBinding

{

    /// <summary>

    /// 可用于自身或导航至 Frame 内部的空白页。

    /// </summary>

    public sealed partial class DataBinding2 : Page

    {

        public MainData MainDataViewModel { get; set; }

        public DataBinding2()

        {

            MainDataViewModel = new MainData();

            this.InitializeComponent();

        }

        private void BtnAdd_OnClick(object sender, RoutedEventArgs e)

        {

            MainDataViewModel.Result = MainDataViewModel.Num1 + MainDataViewModel.Num2;

        }

    }

    public class MainData : INotifyPropertyChanged

    {

        private double num1;

        public double Num1

        {

            get { return num1; }

            set

            {

                num1 = value;

                OnPropertyChanged();

            }

        }

        private double num2;

        public double Num2

        {

            get { return num2; }

            set

            {

                num2 = value;

                OnPropertyChanged();

            }

        }

        private double result;

        public double Result

        {

            get { return result; }

            set

            {

                result = value;

                OnPropertyChanged();

            }

        }

        public event PropertyChangedEventHandler PropertyChanged;

        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)

        {

            if (PropertyChanged != null)

            {

                this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));

            }

        }

    }

}