PocketBook/Sources/ToolKit/BaseViewModel.cs

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

namespace ToolKit
{
    public class BaseViewModel : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

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

            backingField = value;
            OnPropertyChanged(propertyName);
            return true;
        }
    }
}