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92 lines
3.0 KiB
C#
92 lines
3.0 KiB
C#
//
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// MaxLengthAttribute.cs
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//
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// Authors:
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// Marek Safar <marek.safar@gmail.com>
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// Pablo Ruiz García <pablo.ruiz@gmail.com>
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//
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// Copyright (C) 2012 Xamarin Inc (http://www.xamarin.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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#if NET_4_5
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using System;
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using System.Globalization;
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namespace System.ComponentModel.DataAnnotations
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{
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[AttributeUsageAttribute (AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter, AllowMultiple = false)]
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public class MaxLengthAttribute : ValidationAttribute
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{
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private const string DefaultErrorMessage = "The field {0} must be a string or array type with a maximum length of '{1}'.";
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private const string InvalidLengthErrorMessage = "MaxLengthAttribute must have a Length value that is greater than zero. " +
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"Use MaxLength() without parameters to indicate that the string or array can have the maximum allowable length.";
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private bool _maxLength = true;
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public MaxLengthAttribute ()
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: base (() => DefaultErrorMessage)
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{
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}
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public MaxLengthAttribute (int length)
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: this ()
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{
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Length = length;
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_maxLength = false;
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}
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public int Length { get; private set; }
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public override string FormatErrorMessage (string name)
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{
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return string.Format (ErrorMessageString, name, Length);
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}
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public override bool IsValid (object value)
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{
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// See: http://msdn.microsoft.com/en-us/library/gg696614.aspx
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if (this.Length == 0 || this.Length < -1)
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throw new InvalidOperationException (InvalidLengthErrorMessage);
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// Weird, but using 'MaxLength' with no length seems to be valid
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// and we should be returning true, and not throwing. (pablo)
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if (value != null && !_maxLength) {
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if (value is string) {
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return (value as string).Length <= this.Length;
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}
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if (value is Array) {
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return (value as Array).Length <= this.Length;
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}
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// NOTE: from my tests, MS.NET does not support IEnumerable as value. :(
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}
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return true;
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}
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}
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}
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#endif
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