有条件地验证DataContract属性的最佳模式

Question

我有使用DataContract的数据类，并使用System.ComponentModel.DataAnnotations实现了字段验证。

在我的课堂上，type属性使某些字段相关，而另一些字段则不适用。也就是说，某些字段（取决于type属性）将变为无效，而另一些字段将有效。

我正在努力寻找一种好的模式，以优雅的方式验证这种情况。我愿意接受这种情况，这可能意味着我需要将我的课程分成几部分以适应这种多态性。虽然不确定如何。

只要相关，这些数据类将被序列化并存储在ServiceFabric可靠集合上。从API角度来看，可以进行更多验证。

到目前为止，我正在端点控制器中以这种方式（我认为还不令人满意）执行验证。

if (voucher.ServiceType == ServiceType.VaccineCompany)
            {
                if (voucher.Asignee == null)
                {
                    throw new ArgumentNullException("Asignee is required for company vaccine voucher");
                }
                if (!voucher.BookingTime.HasValue)
                {
                    throw new ArgumentNullException("Booking time is required for company vaccine voucher");
                }
                if (!voucher.FixedPrice.HasValue)
                {
                    throw new ArgumentNullException("Fixed price is required for company vaccine voucher");
                }
                if (voucher.Discount.HasValue)
                {
                    throw new ArgumentNullException("Discount is not a valid argument for company vaccine type voucher");
                }
            }

            if (voucher.ServiceType == ServiceType.Vaccine)
            {
                if (voucher.Asignee != null)
                {
                    throw new ArgumentException("Invalid argument asignee");
                }
                if (voucher.BookingTime.HasValue)
                {
                    throw new ArgumentNullException("Invalid argument booking time");
                }
                if (voucher.FixedPrice.HasValue && voucher.Discount.HasValue)
                {
                    throw new ArgumentException("Fixed price and discount cannot be set simultaneously");
                }
            }

这是模型的样子：

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Runtime.Serialization;

namespace Remoting.VoucherService
{
    [DataContract]

    public sealed class Voucher
    {
        [Required(ErrorMessage = "Code is required")]
        [DataMember(Name = "code")]
        public string Code { get; set; }

        [Required(ErrorMessage = "Description is required")]
        [DataMember(Name = "description")]
        public string Description { get; set; }

        [Required(ErrorMessage = "ServiceType is required")]
        [DataMember(Name = "serviceType")]
        public ServiceType ServiceType { get; set; }

        [DataMember(Name = "discount")]
        public double? Discount { get; set; }

        [DataMember(Name = "fixedPrice")]
        public double? FixedPrice { get; set; }

        [DataMember(Name = "isValid")]
        public bool Valid {
            get { return TimesUsed < MaxUsage; }
            set { }
        }

        [DataMember(Name = "maxUsage")]
        public uint MaxUsage { get; set; } = 1;

        [DataMember(Name = "asignee")]
        public string Asignee;

        [DataMember(Name = "bookingTime")]
        public DateTime? BookingTime;

        [DataMember(Name = "timesUsed")]
        public uint TimesUsed { get; set; } = 0;

        public void IncreaseUsage()
        {
            TimesUsed += 1;
        }

        private ExtensionDataObject data;

        public ExtensionDataObject ExtensionData
        {
            get => data;
            set => data = value;
        }
    }
}

我希望有人能为我提供一些见识！