是否可以将客户端验证添加到 MVC C# 的类级别验证器？

Question

我有一个带有自定义验证器的嵌套模型，用于验证子元素。这种方法非常适合服务器端，但是，我还想添加客户端支持。

这是我的模型：

public class Customer
    {
        public string Name { get; set; } = "";

        [AtLeastOneProperty("HomePhone", "WorkPhone", "CellPhone", ErrorMessage = "At least one phone number is required for Customer")]
        public Phone phone { get; set; }

        public Customer()
        {
            phone = new Phone();
        }
    }
     public class Phone
     {
        public string HomePhone { get; set; } = "";

        public string WorkPhone { get; set; } = "";

        public string WorkExt { get; set; } = "";

        public string CellPhone { get; set; } = "";
     }

这是我的验证器：

public class AtLeastOnePropertyAttribute : ValidationAttribute, IClientValidatable
    {
        private readonly string[] _properties;
        public AtLeastOnePropertyAttribute(params string[] properties)
        {
            _properties = properties;
        }

        protected override ValidationResult IsValid(object value, ValidationContext validationContext)
        {
            if (_properties == null || _properties.Length < 1)
            {
                return null;
            }
            PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(value);

            List<string> props = new List<string>();
            props.Add(properties[0].ToString());
            foreach (var property in _properties)
            {

                validationContext = new ValidationContext(value);

                var propertyInfo = validationContext.ObjectType.GetProperty(property);
                if (propertyInfo == null)
                {
                    return new ValidationResult(string.Format("unknown property {0}", property));
                }

                var propertyValue = propertyInfo.GetValue(validationContext.ObjectInstance, null);
                if (propertyValue is string && !string.IsNullOrEmpty(propertyValue as string))
                {
                    return null;
                }

                if (propertyValue != null)
                {
                    return null;
                }
            }

            return new ValidationResult(FormatErrorMessage(validationContext.DisplayName), props);
        }

        public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
        {
            var rule = new ModelClientValidationRule
            {
                ErrorMessage = ErrorMessage,
                ValidationType = "atleastonerequired"
            };
            rule.ValidationParameters["properties"] = string.Join(",", _properties);

            yield return rule;
        }
    }

此代码适用于服务器端验证，但是，我无法让它为我正在检查的那些属性构建客户端验证不显眼的标签。现在它正在尝试为类级别 Phone 构建标签，因为属性标签位于嵌套模型属性而不是单个属性之上。

甚至可以让它添加客户端标签吗？也许制作一个验证适配器？

Answer 1

我之前也使用过Expressive Annotations。它们允许我们指定具有布尔条件的属性，这些条件可以在客户端和服务器端触发。