WPF_Practice/PacticeSolution/MVVMSample/Model/NotifierMain.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MVVMSample.Model
{
    internal class NotifierMain : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler? PropertyChanged;

        public virtual void NotifyChanged(params string[] propertyNames)
        {
            foreach (string name in propertyNames)
            {
                OnPropertyChanged(new PropertyChangedEventArgs(name));
            }
        }

        protected virtual void OnPropertyChanged(PropertyChangedEventArgs e)
        {
            if (PropertyChanged != null)
                PropertyChanged(this, e);
        }

        protected virtual void OnPropertyChanged(string propertyName)
        {
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}