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namespace System.ComponentModel.DataAnnotations {
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Resources;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.Linq;
using System.Reflection;
[AttributeUsage(AttributeTargets.Property, AllowMultiple = false)]
[SuppressMessage("Microsoft.Performance", "CA1813:AvoidUnsealedAttributes", Justification = "This attribute is designed to be a base class for other attributes.")]
public class CompareAttribute : ValidationAttribute {
public CompareAttribute(string otherProperty)
: base(DataAnnotationsResources.CompareAttribute_MustMatch) {
if (otherProperty == null) {
throw new ArgumentNullException("otherProperty");
}
OtherProperty = otherProperty;
}
public string OtherProperty { get; private set; }
public string OtherPropertyDisplayName { get; internal set; }
public override string FormatErrorMessage(string name) {
return String.Format(CultureInfo.CurrentCulture, ErrorMessageString, name, OtherPropertyDisplayName ?? OtherProperty);
}
public override bool RequiresValidationContext {
get {
return true;
}
}
protected override ValidationResult IsValid(object value, ValidationContext validationContext) {
PropertyInfo otherPropertyInfo = validationContext.ObjectType.GetProperty(OtherProperty);
if (otherPropertyInfo == null) {
return new ValidationResult(String.Format(CultureInfo.CurrentCulture, DataAnnotationsResources.CompareAttribute_UnknownProperty, OtherProperty));
}
object otherPropertyValue = otherPropertyInfo.GetValue(validationContext.ObjectInstance, null);
if (!Equals(value, otherPropertyValue)) {
if (OtherPropertyDisplayName == null) {
OtherPropertyDisplayName = GetDisplayNameForProperty(validationContext.ObjectType, OtherProperty);
}
return new ValidationResult(FormatErrorMessage(validationContext.DisplayName));
}
return null;
}
private static string GetDisplayNameForProperty(Type containerType, string propertyName) {
ICustomTypeDescriptor typeDescriptor = GetTypeDescriptor(containerType);
PropertyDescriptor property = typeDescriptor.GetProperties().Find(propertyName, true);
if (property == null) {
throw new ArgumentException(String.Format(CultureInfo.CurrentCulture,
DataAnnotationsResources.Common_PropertyNotFound, containerType.FullName, propertyName));
}
IEnumerable<Attribute> attributes = property.Attributes.Cast<Attribute>();
DisplayAttribute display = attributes.OfType<DisplayAttribute>().FirstOrDefault();
if (display != null) {
return display.GetName();
}
DisplayNameAttribute displayName = attributes.OfType<DisplayNameAttribute>().FirstOrDefault();
if (displayName != null) {
return displayName.DisplayName;
}
return propertyName;
}
private static ICustomTypeDescriptor GetTypeDescriptor(Type type) {
return new AssociatedMetadataTypeTypeDescriptionProvider(type).GetTypeDescriptor(type);
}
}
}
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