PowerToys/src/core/Microsoft.PowerToys.Settings.UI/Helpers/Observable.cs

using System;
using System.ComponentModel;
using System.Runtime.CompilerServices;

namespace Microsoft.PowerToys.Settings.UI.Helpers
{
    public class Observable : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        protected void Set<T>(ref T storage, T value, [CallerMemberName]string propertyName = null)
        {
            if (Equals(storage, value))
            {
                return;
            }

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

        protected void OnPropertyChanged(string propertyName) => this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}