如何根据父 Model 中的值验证属性？

Question

我有一个网站，人们可以在其中申请服务。 他们 select 是他们想要的产品和选项，以及有关他们自己的信息。

model分为几部分：

public class ApplicationInformationModel
{
    public int ProductType { get; set; }
    public ClientModel Client { get; set; }
    ...
}

public class ClientModel {
    public string Name { get; set; }
    [AgeValidation]
    public DateTime DateOfBirth { get; set; }
    ...
}

年龄取决于产品的类型，但我无法从ClientModel访问ProductType变量。

    public class AgeValidationAttribute : ValidationAttribute
    {
        public string GetErrorMessage() => $"The age does not fall within the acceptable range.";

        protected override ValidationResult IsValid(object value, ValidationContext validationContext)
        {
            int productType = // How do I get the productType?
            var dob = (DateTime)value;
            int age = DateTime.Now.Year - dob.Year;
            if (DateTime.Now.DayOfYear < dob.DayOfYear) age--;

            if (productType == 0 && age < 18)
            {
                return new ValidationResult(GetErrorMessage(validationContext.DisplayName));
            }
            else if (productType == 1 && age < 21)
            {
                return new ValidationResult(GetErrorMessage(validationContext.DisplayName));
            }

            return ValidationResult.Success;
        }
    }

如何访问ProductType ？

Answer 1

在 ApplicationInformationModel 中实现IValidatableObject

public class ApplicationInformationModel : IValidatableObject
{
    public int ProductType { get; set; }
    public ClientModel Client { get; set; }
    ...

    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
    {
        //int productType = productType;

        DateTime dob = Client.DateOfBirth;
        int age = DateTime.Now.Year - dob.Year;
        if (DateTime.Now.DayOfYear < dob.DayOfYear) age--;

        if (productType == 0 && age < 18)
        {
            return new ValidationResult(GetErrorMessage(validationContext.DisplayName));
        }
        else if (productType == 1 && age < 21)
        {
            return new ValidationResult(GetErrorMessage(validationContext.DisplayName));
        }

        return ValidationResult.Success;
    }
}

对ClientModel 的更改有一个 ApplicationInformationModel 。

public class ApplicationInformationModel
{
    public int ProductType { get; set; }
    ...
}

public class ClientModel {
    public string Name { get; set; }

    [AgeValidation]
    public DateTime DateOfBirth { get; set; }

    public ApplicationInformationModel applicationInformationModel { get; set; }
    ...
}

然后创建一个继承自ValidationAttribute的 class ，并覆盖IsValid方法。

public class AgeValidationAttribute : ValidationAttribute
{
    public string GetErrorMessage() => $"The age does not fall within the acceptable range.";

    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {

        ClientModel client = (ClientModel)validationContext.ObjectInstance;

        int productType = client.applicationInformationModel.productType;

        DateTime dob = client.DateOfBirth;
        int age = DateTime.Now.Year - dob.Year;
        if (DateTime.Now.DayOfYear < dob.DayOfYear) age--;

        if (productType == 0 && age < 18)
        {
            return new ValidationResult(GetErrorMessage(validationContext.DisplayName));
        }
        else if (productType == 1 && age < 21)
        {
            return new ValidationResult(GetErrorMessage(validationContext.DisplayName));
        }

        return ValidationResult.Success;
    }
}

链接： 将自定义验证属性应用于数据字段