public ビジネス優先度アサイン時(Tenants.テナントId tenantId, バックログアイテムId backlogItemId, ビジネス優先度 businessPriority)
        {
            this.TenantId = tenantId;
            this.EventVersion = 1;
            this.OccurredOn = DateTime.UtcNow;

            this.BacklogItemId = backlogItemId;
            this.BusinessPriority = businessPriority;
        }
 public void AssignBusinessPriority(ビジネス優先度 businessPriority)
 {
     this.BusinessPriority = businessPriority;
     DomainEventPublisher.Instance.Publish(
         new ビジネス優先度アサイン時(this.TenantId, this.BacklogItemId, businessPriority));
 }