mcs/class/System.Web.Mvc3/Mvc/CompareAttribute.cs

   1 namespace System.Web.Mvc {
   2     using System;
   3     using System.Collections.Generic;
   4     using System.ComponentModel.DataAnnotations;
   5     using System.Diagnostics.CodeAnalysis;
   6     using System.Globalization;
   7     using System.Reflection;
   8     using System.Web.Mvc.Resources;
   9
  10     [AttributeUsage(AttributeTargets.Property)]
  11     [SuppressMessage("Microsoft.Performance", "CA1813:AvoidUnsealedAttributes", Justification = "This attribute is designed to be a base class for other attributes.")]
  12     public class CompareAttribute : ValidationAttribute, IClientValidatable {
  13
  14         public CompareAttribute(string otherProperty)
  15             : base(MvcResources.CompareAttribute_MustMatch) {
  16             if (otherProperty == null) {
  17                 throw new ArgumentNullException("otherProperty");
  18             }
  19             OtherProperty = otherProperty;
  20         }
  21
  22         public string OtherProperty { get; private set; }
  23
  24         public override string FormatErrorMessage(string name) {
  25             return String.Format(CultureInfo.CurrentCulture, ErrorMessageString, name, OtherProperty);
  26         }
  27
  28         protected override ValidationResult IsValid(object value, ValidationContext validationContext) {
  29             PropertyInfo otherPropertyInfo = validationContext.ObjectType.GetProperty(OtherProperty);
  30             if (otherPropertyInfo == null) {
  31                 return new ValidationResult(String.Format(CultureInfo.CurrentCulture, MvcResources.CompareAttribute_UnknownProperty, OtherProperty));
  32             }
  33
  34             object otherPropertyValue = otherPropertyInfo.GetValue(validationContext.ObjectInstance, null);
  35             if (!Equals(value, otherPropertyValue)) {
  36                 return new ValidationResult(FormatErrorMessage(validationContext.DisplayName));
  37             }
  38             return null;
  39         }
  40
  41         public static string FormatPropertyForClientValidation(string property) {
  42             if (property == null) {
  43                 throw new ArgumentException(MvcResources.Common_NullOrEmpty, "property");
  44             }
  45             return "*." + property;
  46         }
  47
  48         public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context) {
  49             yield return new ModelClientValidationEqualToRule(FormatErrorMessage(metadata.GetDisplayName()), FormatPropertyForClientValidation(OtherProperty));
  50         }
  51     }
  52 }