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Hi friends,
I had a requirement, where I need to check one value is always greater than other.
I have created a custom data annotation as follows:
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Web.Mvc;

namespace AmericanExpress.GFES.INXSOnlineAdmin.WP.CustomValidation
{
    public class GreaterThanAttribute : ValidationAttribute, IClientValidatable
    {
        public string PropertyNameToCompare { get; set; }
        public string ErrorMessage { get; set; }

        public GreaterThanAttribute(string propertyNameToCompare, string errorMessage)
        {
            PropertyNameToCompare = propertyNameToCompare;
            ErrorMessage = errorMessage;
        }

        protected override ValidationResult IsValid(object value, ValidationContext validationContext)
        {
            var propertyToCompare = validationContext.ObjectType.GetProperty(PropertyNameToCompare);
            if (propertyToCompare == null)
            {
                return new ValidationResult(
                    string.Format("Invalid property name '{0}'", PropertyNameToCompare));
            }
            var valueToCompare = propertyToCompare.GetValue(validationContext.ObjectInstance, null);

            bool valid;

            if (value is decimal && valueToCompare is decimal)
            {
                valid = ((decimal)value) > ((decimal)valueToCompare);
            }
            //TODO: Other types
            else
            {
                return new ValidationResult("Compared properties should be numeric and of the same type.");
            }

            if (valid)
            {
                return ValidationResult.Success;
            }

            return new ValidationResult(
                string.Format("{0} must be greater than {1}",
                    validationContext.DisplayName, PropertyNameToCompare));
        }

        public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
        {
            var rule = new ModelClientValidationRule();

            rule.ErrorMessage = ErrorMessage;
            rule.ValidationParameters.Add("other", PropertyNameToCompare);
            rule.ValidationType = "greaterthan";

            yield return rule;
        }
    }
}

In Model:
[Required(ErrorMessage = "Please enter minimum range")]
        public decimal RangeMin { get; set; }

        [Required(ErrorMessage = "Please enter maximum range")]
        [GreaterThan("RangeMin","Max range must be greater than Min")]
        public decimal RangeMax { get; set; }

In Partial View:
<script>
        $(document).ready(function () {
            $.validator.unobtrusive.parse("#frmSavePromotion");

            $.validator.addMethod('greaterthan', function (value, element) {
                return $(element).is(":checked");
            });

            $.validator.unobtrusive.adapters.add('greaterthan', [], function (options) {
                options.messages['greaterthan'] = options.message;
                options.rules['greaterthan'] = options.params;
            });
        });
    </script>


I have tried above, but it is working for me.

Can anyone tell me where I'm going wrong?

Thanks in advance
Posted

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)




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