/// <summary>
    /// Customer数据转输对象抽象类，放Customer通过属性
    /// </summary>
    public abstract class CustomerCommand : Command
    {
        public Guid Id { get; protected set; }

        public string Name { get; protected set; }

        public string Email { get; protected set; }

        public DateTime BirthDate { get; protected set; }
    }

    /// <summary>
    /// Customer注册命令消息参数
    /// </summary>
    public class RegisterNewCustomerCommand : CustomerCommand
    {
        public RegisterNewCustomerCommand(string name, string email, DateTime birthDate)
        {
            Name = name;
            Email = email;
            BirthDate = birthDate;
        }

           /// <summary>
        /// 命令信息参数验证
        /// </summary>
        /// <returns></returns>
        public override bool IsValid()
        {
            ValidationResult = new RegisterNewCustomerCommandValidation().Validate(this);
            return ValidationResult.IsValid;
        }
    }

        /// <summary>
        /// 新增
        /// </summary>
        /// <param name="customerViewModel">视图模型</param>
        public void Register(CustomerViewModel customerViewModel)
        {
            //将视图模型 映射到  RegisterNewCustomerCommand 新增命令实体
            var registerCommand = _mapper.Map<RegisterNewCustomerCommand>(customerViewModel);
            Bus.SendCommand(registerCommand);
        }

         /// <summary>
        /// Customer注册命令处理
        /// </summary>
        /// <param name="message"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public Task<bool> Handle(RegisterNewCustomerCommand message, CancellationToken cancellationToken)
        {
            //对实体属性进行验证
            if (!message.IsValid())
            {
                NotifyValidationErrors(message);
                return Task.FromResult(false);
            }

            //将命令消息转成领域实体
            var customer = new Customer(Guid.NewGuid(), message.Name, message.Email, message.BirthDate);

            //如果注册用户邮件已存在,发起一个事件
            if (_customerRepository.GetByEmail(customer.Email) != null)
            {
                Bus.RaiseEvent(new DomainNotification(message.MessageType, "The customer e-mail has already been taken."));
                return Task.FromResult(false);
            }

            //由Equinox.Infra.Data.Repository来实现数据持久化。事件是过去在系统中发生的事情。该事件通常是命令的结果.
            _customerRepository.Add(customer);

            //新增成功后，使用事件记录这次命令。
            if (Commit())
            {
                Bus.RaiseEvent(new CustomerRegisteredEvent(customer.Id, customer.Name, customer.Email, customer.BirthDate));
            }

            return Task.FromResult(true);
        }