WPF_Practice/PacticeSolution/ProgressBarMVVMSample/Model/BindableBase.cs

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

namespace ProgressBarMVVMSample.Model
{
    internal class BindableBase : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        protected bool SetProperty<T>(ref T storage, T value, [CallerMemberName] string propertyName = null)
        {
            if (Equals(storage, value)) 
                return false;

            storage = value;
            this.OnPropertyChanged(propertyName);
            return true;
        }

        private void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            if (this.PropertyChanged == null)
                return;

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