WebAPI - FluentValidation - 根据父模型值验证子模型属性答案

【问题标题】：WebAPI - FluentValidation - Validate Child model properties based on parent model valueWebAPI - FluentValidation - 根据父模型值验证子模型属性
【发布时间】：2017-10-30 12:25:59
【问题描述】：

public class ParentClass
{
    public int ParentId { get; set; }
    public int ActivityId { get; set; }
    public DateTime UpateDate { get; set; }
    public IList<ChildClass> ChildList { get; set; }
}

public class ParentClassValidator : AbstractValidator<ParentClass>
{
    public ParentClassValidator()
    {
        RuleFor(x => x.ParentId).NotEmpty().WithMessage("Parent Id cannot be empty");
        When(x => x.ParentId == 1, () =>
          {
              RuleFor(x => x.ActivityId).NotEmpty().WithMessage("Activity To cannot be empty.");
              RuleFor(x => x.ChildList).SetCollectionValidator(new ChildClassValidator().Validate(new ChildClass(), "ParentId1"));
          });
    }
}

public class ChildClass
{
    public int ChildId { get; set; }
    public DateTime DueDate { get; set; }

}

public class ChildClassValidator : AbstractValidator<ChildClass>
{
    public ChildClassValidator()
    {
        RuleFor(x => x.ChildId).NotEmpty().WithMessage("Child Id cannot be empty");
        RuleSet("ParentId1", () =>
        {
            RuleFor(x => x.DueDate).Must(date => date != default(DateTime)).WithMessage("Due date cannot be empty");
        });
    }
}

我正在尝试根据父模型属性值验证子列表。

我需要验证来自父母的所有孩子的通用规则和特定规则集。我在父验证器中尝试了以下代码RuleFor(x => x.ChildList).SetCollectionValidator(new ChildClassValidator().Validate(new ChildClass(), "ParentId1"));，但不允许

我查看了Child Model Validation using Parent Model Values. Fluent Validation. MVC4，但它只适用于一处房产。

【问题讨论】：

标签： c# validation asp.net-web-api fluentvalidation

【解决方案1】：

[Validator(typeof(ParentClassValidator))]
public class ParentClass
{
    public int ParentId { get; set; }
    public int ActivityId { get; set; }
    public DateTime UpateDate { get; set; }
    public IList<ChildClass> ChildList { get; set; }
}

public class ParentClassValidator : AbstractValidator<ParentClass>
{
    public ParentClassValidator()
    {
        RuleFor(x => x.ParentId).NotEmpty().WithMessage("Parent Id cannot be empty");
        When(x => x.ParentId == 1, () =>
        {
              RuleFor(x => x.ActivityId).NotEmpty().WithMessage("Activity To cannot be empty.");
        });
    }

    public override ValidationResult Validate(ValidationContext<ParentClass> context)
    {
        RuleFor(x => x.ChildList).SetCollectionValidator(new ExtMobileTransactionDataValidator(context.InstanceToValidate));
        return base.Validate(context);
    }
}

public class ChildClass
{
    public int ChildId { get; set; }
    public DateTime DueDate { get; set; }

}

public class ChildClassValidator : AbstractValidator<ChildClass>
{
    public ChildClassValidator(ParentClass parent)
    {
        RuleFor(x => x.ChildId).NotEmpty().WithMessage("Child Id cannot be empty");
        if(parent.ParentId == 1)
        {
            RuleFor(x => x.DueDate).Must(date => date != default(DateTime)).WithMessage("Due date cannot be empty");
        }
    }
}

我能够通过重写 Validate 方法来实现它。

如果子类不会被单独验证，请记住删除子类的 Validator 属性，否则会抛出“未定义无参数构造函数”错误。

【讨论】：