Some enhancements and additions to DataAnnotations, incluiding implementation of a few missing pieces of Sys.ComponentModel.DataAnnotations v4.5, like:

mcs/class/System.ComponentModel.DataAnnotations/System.ComponentModel.DataAnnotations/CompareAttribute.cs

@@ -0,0 +1,118 @@
+//
+// CompareAttribute.cs
+//
+// Authors:
+//	Pablo Ruiz García <pablo.ruiz@gmail.com>
+//
+// Copyright (C) 2012 Xamarin Inc (http://www.xamarin.com)
+// Copyright (C) 2013 Pablo Ruiz García
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+
+#if NET_4_5
+
+using System;
+using System.Linq;
+using System.Globalization;
+using System.ComponentModel;
+using System.Collections.Generic;
+
+namespace System.ComponentModel.DataAnnotations
+{
+	[AttributeUsageAttribute (AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter, AllowMultiple = false)]
+	public class CompareAttribute : ValidationAttribute
+	{
+		private const string DefaultErrorMessage = "'{0}' and '{1}' do not match.";
+		private const string NonExistingPropertyErrorMessage = "Could not find a property named {0}.";
+		private string _otherProperty;
+		private string _otherPropertyDisplayName;
+
+		public CompareAttribute (string otherProperty)
+			: base (() => DefaultErrorMessage)
+		{
+			if (string.IsNullOrEmpty (otherProperty))
+				throw new ArgumentNullException ("otherProperty");
+
+			_otherProperty = otherProperty;
+		}
+
+		public string OtherProperty { get { return _otherProperty; } }
+		public string OtherPropertyDisplayName { get { return _otherPropertyDisplayName; } }
+		public override bool RequiresValidationContext { get { return true; } }
+
+		private IEnumerable<Attribute> GetPropertyAttributes (Type type, string propertyName)
+		{
+#if MOBILE
+			return TypeDescriptor.GetProperties (type).Find (propertyName, false).Attributes.OfType<Attribute> ();
+#else
+			// Using AMTTDP seems the way to go to be able to relay on attributes declared
+			// by means of associated classes not directly decorating the property.
+			// See: http://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations.associatedmetadatatypetypedescriptionprovider.aspx
+			return new AssociatedMetadataTypeTypeDescriptionProvider (type)
+				.GetTypeDescriptor (type)
+				.GetProperties ()
+				.Find (propertyName, false)
+				.Attributes.OfType<Attribute> ();
+#endif
+		}
+
+		private void ResolveOtherPropertyDisplayName (ValidationContext context)
+		{
+			if (_otherPropertyDisplayName == null)
+			{
+				// NOTE: From my own tests, it seems MS.NET looksup displayName from various sources, what follows
+				// 	 is a best guess from my on tests, however, I am probably missing some corner cases. (pruiz)
+				var attributes = GetPropertyAttributes (context.ObjectType, _otherProperty);
+				var displayAttr = attributes.FirstOrDefault (x => x is DisplayAttribute) as DisplayAttribute;
+				var displayNameAttr = attributes.FirstOrDefault (x => x is DisplayNameAttribute) as DisplayNameAttribute;
+
+				if (displayAttr != null) _otherPropertyDisplayName = displayAttr.GetName ();
+				else if (displayNameAttr != null) _otherPropertyDisplayName = displayNameAttr.DisplayName;
+				_otherPropertyDisplayName = _otherProperty;
+			}
+		}
+
+		public override string FormatErrorMessage (string name)
+		{
+			var oname = string.IsNullOrEmpty (_otherPropertyDisplayName) ? _otherProperty : _otherPropertyDisplayName;
+			return string.Format (ErrorMessageString, name, oname);
+		}
+
+		protected override ValidationResult IsValid(object value, ValidationContext context)
+		{
+			var property = context.ObjectType.GetProperty (_otherProperty);
+
+			if (property == null) {
+				string message = string.Format (NonExistingPropertyErrorMessage, _otherProperty);
+				return new ValidationResult (message);
+			}
+
+			// XXX: Could not find a better place to call this, as this is 
+			// 	the only place we have access to a ValidationContext. (pruiz)
+			ResolveOtherPropertyDisplayName (context);
+
+			return object.Equals (property.GetValue (context.ObjectInstance, null), value) ? null
+				: new ValidationResult (FormatErrorMessage (context.DisplayName));
+		}
+	}
+}
+
+#endif

mcs/class/System.ComponentModel.DataAnnotations/System.ComponentModel.DataAnnotations/CreditCardAttribute.cs

@@ -0,0 +1,81 @@
+//
+// CreditCardAttribute.cs
+//
+// Authors:
+//	Marek Safar  <marek.safar@gmail.com>
+//      Pablo Ruiz García <pablo.ruiz@gmail.com>
+//
+// Copyright (C) 2013 Xamarin Inc (http://www.xamarin.com)
+// Copyright (C) 2013 Pablo Ruiz García
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+
+#if NET_4_5
+
+using System;
+using System.Linq;
+using System.Globalization;
+
+namespace System.ComponentModel.DataAnnotations
+{
+	[AttributeUsageAttribute (AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter, AllowMultiple = false)]
+	public class CreditCardAttribute : DataTypeAttribute
+	{
+		private const string DefaultErrorMessage = "The {0} field is not a valid credit card number.";
+
+		public CreditCardAttribute ()
+			: base(DataType.CreditCard)
+		{
+			// XXX: There is no .ctor accepting Func<string> on DataTypeAttribute.. :?
+			base.ErrorMessage = DefaultErrorMessage;
+		}
+
+		public override bool IsValid(object value)
+		{
+			if (value == null)
+				return true;
+
+			if (string.IsNullOrEmpty(value as string))
+				return false;
+
+			// Remove any invalid characters..
+			var creditCardNumber = (value as string).Replace("-", "").Replace(" ", "");
+
+			if (creditCardNumber.Any (x => !Char.IsDigit (x)))
+				return false;
+
+			// Performan a Luhn-based check against credit card number.
+			//
+			// See: http://en.wikipedia.org/wiki/Luhn_algorithm
+			// See: http://rosettacode.org/wiki/Luhn_test_of_credit_card_numbers
+			// See: http://www.codeproject.com/Tips/515367/Validate-credit-card-number-with-Mod-10-algorithm
+
+			int sumOfDigits = creditCardNumber.Where((e) => e >= '0' && e <= '9')
+				.Reverse()
+				.Select((e, i) => ((int)e - 48) * (i % 2 == 0 ? 1 : 2))
+				.Sum((e) => e / 10 + e % 10);
+
+			return sumOfDigits % 10 == 0;
+		}
+	}
+}
+
+#endif

mcs/class/System.ComponentModel.DataAnnotations/System.ComponentModel.DataAnnotations/DataType.cs

@@ -46,7 +46,12 @@ public enum DataType
 		Password,
 		Url,
 #if NET_4_0
-		ImageUrl
+		ImageUrl,
+#endif
+#if NET_4_5
+		CreditCard,
+		PostalCode,
+		Upload
 #endif
 	}
 }

mcs/class/System.ComponentModel.DataAnnotations/System.ComponentModel.DataAnnotations/DataTypeAttribute.cs

@@ -3,10 +3,10 @@
 //
 // Author:
 //	Atsushi Enomoto <atsushi@ximian.com>
+//	Pablo Ruiz García <pablo.ruiz@gmail.com>
 //
 // Copyright (C) 2008 Novell Inc. http://novell.com
-//
-
+// Copyright (C) 2013 Pablo Ruiz García
 //
 // Permission is hereby granted, free of charge, to any person obtaining
 // a copy of this software and associated documentation files (the
@@ -50,6 +50,27 @@ public DataTypeAttribute (DataType dataType)
 					displayFormat.ApplyFormatInEditMode = true;
 					displayFormat.ConvertEmptyStringToNull = true;
 					displayFormat.DataFormatString = "{0:t}";
+#if NET_4_0
+					displayFormat.HtmlEncode = true;
+#endif
+					break;
+				case DataType.Date:
+					displayFormat = new DisplayFormatAttribute ();
+					displayFormat.ApplyFormatInEditMode = true;
+					displayFormat.ConvertEmptyStringToNull = true;
+					displayFormat.DataFormatString = "{0:d}";
+#if NET_4_0
+					displayFormat.HtmlEncode = true;
+#endif
+					break;
+				case DataType.Currency:
+					displayFormat = new DisplayFormatAttribute ();
+					displayFormat.ApplyFormatInEditMode = false;
+					displayFormat.ConvertEmptyStringToNull = true;
+					displayFormat.DataFormatString = "{0:C}";
+#if NET_4_0
+					displayFormat.HtmlEncode = true;
+#endif
 					break;
 
 				default:

mcs/class/System.ComponentModel.DataAnnotations/System.ComponentModel.DataAnnotations/EmailAddressAttribute.cs

@@ -0,0 +1,73 @@
+//
+// EmailAddressAttribute.cs
+//
+// Authors:
+//	Marek Safar  <marek.safar@gmail.com>
+//      Pablo Ruiz García <pablo.ruiz@gmail.com>
+//
+// Copyright (C) 2013 Xamarin Inc (http://www.xamarin.com)
+// Copyright (C) 2013 Pablo Ruiz García
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+
+#if NET_4_5
+
+using System;
+using System.Globalization;
+using System.Text.RegularExpressions;
+
+namespace System.ComponentModel.DataAnnotations
+{
+	[AttributeUsageAttribute (AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter, AllowMultiple = false)]
+	public class EmailAddressAttribute : DataTypeAttribute
+	{
+		private const string DefaultErrorMessage = "The {0} field is not a valid e-mail address.";
+		// See: http://stackoverflow.com/questions/16167983/best-regular-expression-for-email-validation-in-c-sharp
+		// See: http://en.wikipedia.org/wiki/List_of_Internet_top-level_domains
+		private const string _emailRegexStr =   @"[a-zA-Z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*" +
+						  	@"@(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-z0-9])?\.)+(?:[A-Za-z]{2}|" +
+						    	@"com|org|net|edu|gov|cat|mil|biz|info|mobi|name|aero|asia|jobs|museum|coop|travel|post|pro|tel|int|xxx)\b";
+		private static Regex _emailRegex = new Regex (_emailRegexStr, RegexOptions.IgnoreCase | RegexOptions.Compiled);
+
+		public EmailAddressAttribute ()
+			: base(DataType.EmailAddress)
+		{
+			// XXX: There is no .ctor accepting Func<string> on DataTypeAttribute.. :?
+			base.ErrorMessage = DefaultErrorMessage;
+		}
+
+		public override bool IsValid(object value)
+		{
+			if (value == null)
+				return true;
+
+			if (value is string)
+			{
+				var str = value as string;
+				return !string.IsNullOrEmpty(str) ? _emailRegex.IsMatch(str) : false;
+			}
+
+			return false;
+		}
+	}
+}
+
+#endif