## mark a section (Learn more)

/// <summary> /// This entity base class is used to be able to do equality checks /// in one place. Otherwise the test will throw a /// System.ApplicationException: Expected 'Product' but got 'ProductProxy....' for Property 'Product' /// when checking references /// </summary> /// <typeparam name="TEntity"></typeparam> public abstract class EntityBase<TEntity> where TEntity : EntityBase<TEntity> { private int? oldHashCode; public virtual Guid Id { get; protected set; } public virtual bool Equals(EntityBase<TEntity> other) { if (ReferenceEquals(null, other)) return false; if (ReferenceEquals(this, other)) return true; return Equals(other.Id, Id); } public override int GetHashCode() { // Once we have a hash code we'll never change it if (oldHashCode.HasValue) return oldHashCode.Value; var thisIsTransient = Equals(Id, Guid.Empty); // When this instance is transient, we use the base GetHashCode() // and remember it, so an instance can NEVER change its hash code. if (thisIsTransient) { oldHashCode = base.GetHashCode(); return oldHashCode.Value; } return Id.GetHashCode(); } public override bool Equals(object obj) { var other = obj as TEntity; if (other == null) return false; // handle the case of comparing two NEW objects var otherIsTransient = Equals(other.Id, Guid.Empty); var thisIsTransient = Equals(Id, Guid.Empty); if (otherIsTransient && thisIsTransient) return ReferenceEquals(other, this); return other.Id.Equals(Id); } }

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