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