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1 using System;
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2
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3 namespace BLToolkit.Validation
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4 {
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5 [AttributeUsage(AttributeTargets.Property | AttributeTargets.Field)]
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6 public class MaxLengthAttribute : ValidatorBaseAttribute
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7 {
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8 public MaxLengthAttribute(int maxLength)
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9 {
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10 _value = maxLength;
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11 }
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12
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13 public MaxLengthAttribute(int maxLength, string errorMessage)
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14 : this(maxLength)
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15 {
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16 ErrorMessage = errorMessage;
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17 }
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18
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19 private readonly int _value;
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20 public int Value
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21 {
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22 get { return _value; }
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23 }
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24
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25 public override bool IsValid(ValidationContext context)
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26 {
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27 return context.IsNull(context) || context.Value.ToString().Length <= _value;
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28 }
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29
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30 public override string ErrorMessage
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31 {
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32 get { return base.ErrorMessage ?? "'{0}' maximum length is {1}."; }
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33 set { base.ErrorMessage = value; }
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34 }
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35
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36 public override string GetErrorMessage(ValidationContext context)
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37 {
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38 return string.Format(ErrorMessage, GetPropertyFriendlyName(context), Value);
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39 }
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40 }
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41 }
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