src/Services/Ordering/Ordering.Domain/SeedWork/Entity.cs

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namespace Microsoft.eShopOnContainers.Services.Ordering.Domain.Seedwork;

public abstract class Entity
{
    int? _requestedHashCode;
    int _Id;
    public virtual int Id
    {
        get
        {
            return _Id;
        }
        protected set
        {
            _Id = value;
        }
    }

    private List<INotification> _domainEvents;
    public IReadOnlyCollection<INotification> DomainEvents => _domainEvents?.AsReadOnly();

    public void AddDomainEvent(INotification eventItem)
    {
        _domainEvents = _domainEvents ?? new List<INotification>();
        _domainEvents.Add(eventItem);
    }

    public void RemoveDomainEvent(INotification eventItem)
    {
        _domainEvents?.Remove(eventItem);
    }

    public void ClearDomainEvents()
    {
        _domainEvents?.Clear();
    }

    public bool IsTransient()
    {
        return this.Id == default(Int32);
    }

    public override bool Equals(object obj)
    {
        if (obj == null || !(obj is Entity))
            return false;

        if (Object.ReferenceEquals(this, obj))
            return true;

        if (this.GetType() != obj.GetType())
            return false;

        Entity item = (Entity)obj;

        if (item.IsTransient() || this.IsTransient())
            return false;
        else
            return item.Id == this.Id;
    }