实现 IValidatableObject 时的自定义错误消息

Question

我已经实施 IValidatableObject 没有任何问题：

 public class DisclaimerCBs : IValidatableObject
 {
        public bool cb1 { get; set; } = false;
        public bool cb2 { get; set; } = false;
        public bool cb3 { get; set; } = false;

        public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
        {
            Type type = validationContext.ObjectInstance.GetType();
            IEnumerable<PropertyInfo> checkBoxeProperties = type.GetProperties(BindingFlags.Instance | BindingFlags.Public).Where(p => p.PropertyType == typeof(bool));

            bool allIsChecked = true;
            foreach (PropertyInfo checkBoxProperty in checkBoxeProperties)
            {
                var isChecked = (bool)checkBoxProperty.GetValue(validationContext.ObjectInstance);
                if (!isChecked)
                {
                    allIsChecked = false;
                    break;
                }
            }

            if(!allIsChecked)
                yield return new ValidationResult("Please agree to all Disclaimers. ");

            //TRUE IF THIS FAR
            yield return ValidationResult.Success;
        }
}

但是，这只会在验证摘要中显示错误消息。我还想让这个错误将焦点放在指定的 <div> 元素上，并在标签中重申错误，就像属性验证器使用 <span asp-validation-for="Model.Property"></span> 所做的那样。我怎样才能做到这一点？

Answer 1

将您的 Validate 方法替换为以下内容：

public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
{
     Type type = validationContext.ObjectInstance.GetType();
     IEnumerable<PropertyInfo> checkBoxeProperties = type.GetProperties(BindingFlags.Instance | BindingFlags.Public).Where(p => p.PropertyType == typeof(bool));

     List<ValidationResult> validationResult = new List<ValidationResult>();

     foreach (PropertyInfo checkBoxProperty in checkBoxeProperties)
     {
         var isChecked = (bool)checkBoxProperty.GetValue(validationContext.ObjectInstance);
         if (!isChecked)
         {
             validationResult.Add(new ValidationResult("Please agree to this Disclaimer.", new[] { checkBoxProperty.Name }));
         }
     }

     return validationResult;
}

实现 IValidatableObject 时的自定义错误消息

Custom Error Message while implementing IValidatableObject

razor

unobtrusive-validation

asp.net-core