WPF SetProperty to implement compare,assign and notify

protected void SetProperty<T>(ref T field,T value, [CallerMemberName] string propName=null)
{
    if(!EqualityComparer<T>.Default.Equals (field, value))
    {
        field= value;
        var handler = PropertyChanged;
        if(handler!=null)
        {
            handler?.Invoke (this, new PropertyChangedEventArgs(propName));
        }
    }
}

 

Whole code

//xaml
<Window x:Class="WpfApp73.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"    
        xmlns:local="clr-namespace:WpfApp73" 
        Title="MainWindow" Height="850" Width="800">
    <StackPanel Margin="100" TextBlock.FontSize="20">
        <TextBlock Text="{Binding Name}"/>
        <TextBlock Text="{Binding Age}"/>
        <Button Content="Increment Age" Click="IncrementAgeClick"/>
    </StackPanel> 
</Window>

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Linq.Expressions;
using System.Runtime.CompilerServices;
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;

namespace WpfApp73
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        private Person _person;
        public MainWindow()
        {
            InitializeComponent();
            _person = new Person()
            {
                Age = 17,
                Name = "Fred"
            };
            this.DataContext= _person;
        }          

        private void IncrementAgeClick(object sender, RoutedEventArgs e)
        {
            _person.Age++;
        }
    }

    class Person:INotifyPropertyChanged
    {
        public string Name { get; set; }
        private int age;
        public int Age
        {
            get
            {
                return age;
            }
            set
            {
               SetProperty(ref age, value);
            }
        }
        public event PropertyChangedEventHandler PropertyChanged;
        public void OnPropertyChanged(string propertyName) 
        {
            var handler=PropertyChanged;
            if (handler != null)
            {
                handler?.Invoke(this, new PropertyChangedEventArgs(propertyName));
            } 
        } 

        protected void SetProperty<T>(ref T field,T value, [CallerMemberName] string propName=null)
        {
            if(!EqualityComparer<T>.Default.Equals (field, value))
            {
                field= value;
                var handler = PropertyChanged;
                if(handler!=null)
                {
                    handler?.Invoke (this, new PropertyChangedEventArgs(propName));
                }
            }
        }
    }

}