BaseViewModel.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 crypto
{
    public abstract class BaseViewModel : INotifyPropertyChanged
    {
        #region Events
        public event PropertyChangedEventHandler? PropertyChanged;

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

        protected virtual bool Set<T>(ref T field, T value, [CallerMemberName] string PropertyName = null)
        {
            if (Equals(field, value)) return false;
            field = value;
            OnPropertyChanged(PropertyName);
            return true;
        }
    }
}