如何验证与其他字段相关的字段

Question

上课了Report。我想要 makeComment和ReasonIdsrequired if 的值Score小于 4。我不能使用属性验证，因为你不能使用字段作为属性参数。我如何在 ASP.NET MVC 核心应用程序中验证这些字段？

public class Report

{

    public int Score { get; set; }

    public string Comment { get; set; }

    public int[] ReasonIds { get; set; }

}

Answer 1

这应该会给你你正在寻找的东西。public class Report : ValidationAttribute&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; public int Score { get; set; }&nbsp; &nbsp; &nbsp; &nbsp; public string Comment { get; set; }&nbsp; &nbsp; &nbsp; &nbsp; public int[] ReasonIds { get; set; }&nbsp; &nbsp; &nbsp; &nbsp; protected override ValidationResult IsValid(&nbsp; &nbsp; &nbsp; &nbsp; object value, ValidationContext validationContext)&nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if(Score < 4 && (string.IsNullOrEmpty(Comment) || ReasonIds.Count() < 1))&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return new ValidationResult(GeScoreErrorMessage());&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return ValidationResult.Success;&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; private string GeScoreErrorMessage()&nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return $"If Score < 4 Comment and Reasons must be provided";&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; }