jameshulse

var person = new Person(name: "James", age: 27);
var update = new PersonUpdate { age = 28 };

var changes = Map.MapWithChanges(update, person); // Theoretical API

if(changes.Any())
  _db.Save(person);
  

jameshulse

public class LazyDictionary<TKey, TValue>
{
    private readonly Func<TKey, TValue> _factory;
    private readonly Dictionary<TKey, TValue> _cache;

    public LazyDictionary(Func<TKey, TValue> factory)
    {
        _factory = factory;
        _cache = new Dictionary<TKey, TValue>();
    }