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// 实体基类
public abstract class Entity
{
    public Guid Id { get; protected set; }

    protected Entity()
    {
        Id = Guid.NewGuid();
    }
}

// 值对象基类
public abstract class ValueObject<T> where T : ValueObject<T>
{
    public override bool Equals(object obj)
    {
        var other = obj as T;
        if (other == null)
        {
            return false;
        }
        return EqualsCore(other);
    }

    protected abstract bool EqualsCore(T other);

    public override int GetHashCode()
    {
        return GetHashCodeCore();
    }

    protected abstract int GetHashCodeCore();
}

// 聚合根基类
public abstract class AggregateRoot : Entity
{
    private List<DomainEvent> _events = new List<DomainEvent>();

    protected void AddEvent(DomainEvent @event)
    {
        _events.Add(@event);
    }

    public IReadOnlyList<DomainEvent> GetEvents()
    {
        return _events.AsReadOnly();
    }

    public void ClearEvents()
    {
        _events.Clear();
    }
}

// 领域事件基类
public abstract class DomainEvent
{
}

// 仓储接口
public interface IRepository<T> where T : AggregateRoot
{
    void Add(T entity);
    void Remove(T entity);
    T GetById(Guid id);
}

// 仓储基类
public abstract class Repository<T> : IRepository<T> where T : AggregateRoot
{
    protected readonly List<T> _entities = new List<T>();

    public void Add(T entity)
    {
        _entities.Add(entity);
    }

    public void Remove(T entity)
    {
        _entities.Remove(entity);
    }

    public T GetById(Guid id)
    {
        return _entities.FirstOrDefault(e => e.Id == id);
    }
}