Avalonia/samples/MiniMvvm/ViewModelBase.cs

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

namespace MiniMvvm
{
    public class ViewModelBase : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler? PropertyChanged;

        protected bool RaiseAndSetIfChanged<T>(ref T field, T value, [CallerMemberName] string? propertyName = null)
        {
            if (!EqualityComparer<T>.Default.Equals(field, value))
            {
                field = value;
                RaisePropertyChanged(propertyName);
                return true;
            }
            return false;
        }

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