Visual Studio/WPF > IDE > Error: 'Greeting'은 인터페이스 멤버 'INotifyPropertyChange.ProPertyChanged'를 구현하지 않습니다. > 마우스 클릭으로 해결

Windows 7 Pro (32bit)
Microsoft Visual Studio 2017 Community
Sublime Text 2

오류

code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
//
using System.ComponentModel;

namespace _170605_t1120_singleBinding
{
    /// <summary>
    /// MainWindow.xaml の相互作用ロジック
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
    }

    public class Greeing : INotifyPropertyChanged
    {
        private bool _isFriendly;
        public bool IsFriendly
        {
            get { return _isFriendly; }
            set {
                if (value != this._isFriendly)
                {
                    this._isFriendly = value;
                    NotifyPropertyChanged("IsFriendly");
                }
            }
        }

        public event PropertyChangedEventHandler hndlr;

        private void NotifyPropertyChanged(string info)
        {
            if (hndlr != null)
            {
                hndlr(this, new PropertyChangedEventArgs(info));
            }
        }
        public void Greet()
        {
            NotifyPropertyChanged("Message");
        }
    }
}

오류 메시지

대처

        public event PropertyChangedEventHandler PropertyChanged;

        public event PropertyChangedEventHandler hndlr;