2 // MinLengthAttribute.cs
5 // Marek Safar <marek.safar@gmail.com>
6 // Pablo Ruiz GarcĂa <pablo.ruiz@gmail.com>
8 // Copyright (C) 2013 Xamarin Inc (http://www.xamarin.com)
10 // Permission is hereby granted, free of charge, to any person obtaining
11 // a copy of this software and associated documentation files (the
12 // "Software"), to deal in the Software without restriction, including
13 // without limitation the rights to use, copy, modify, merge, publish,
14 // distribute, sublicense, and/or sell copies of the Software, and to
15 // permit persons to whom the Software is furnished to do so, subject to
16 // the following conditions:
18 // The above copyright notice and this permission notice shall be
19 // included in all copies or substantial portions of the Software.
21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
33 using System.Globalization;
35 namespace System.ComponentModel.DataAnnotations
37 [AttributeUsageAttribute (AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter, AllowMultiple = false)]
38 public class MinLengthAttribute : ValidationAttribute
40 private const string DefaultErrorMessage = "The field {0} must be a string or array type with a minimum length of '{1}'.";
41 private const string InvalidLengthErrorMessage = "MinLengthAttribute must have a Length value that is zero or greater.";
43 public MinLengthAttribute ()
47 public MinLengthAttribute (int length)
52 public int Length { get; private set; }
54 public override string FormatErrorMessage (string name)
56 return string.Format (ErrorMessageString, name, Length);
59 public override bool IsValid (object value)
62 throw new InvalidOperationException (InvalidLengthErrorMessage);
66 if (value is string) {
67 return (value as string).Length >= this.Length;
71 return (value as Array).Length >= this.Length;
74 // NOTE: from my tests, MS.NET does not support IEnumerable as value. :(