MinMaxStringLengthAttribute

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Web.Mvc;

namespace IncassoBeheer.UI.Helpers.Filter
{
    /// <summary>
    /// Specifies the minimum and maximum length of characters that are allowed in a data field.
    /// </summary>
    [AttributeUsage(AttributeTargets.Property, AllowMultiple = false)]
    public class MinMaxStringLengthAttribute : StringLengthAttribute, IClientValidatable
    {
        public MinMaxStringLengthAttribute(int maximumLength, string errorMessage = "") : base(maximumLength)
        {
            ErrorMessage = errorMessage;
        }

        public MinMaxStringLengthAttribute(int minimumLength , int maximumLength, string errorMessage="") : base(maximumLength)
        {
            MinimumLength = minimumLength;
            ErrorMessage = errorMessage;
        }

        public override string FormatErrorMessage(string name)
        {
            EnsureLegalLengths();
            return String.IsNullOrWhiteSpace(ErrorMessage)
                       ? String.Format("{0} moet minimum {1} en maximum {2} tekens bevatten.", name, MinimumLength, MaximumLength)
                       : ErrorMessage;
        }

        private void EnsureLegalLengths()
        {
            if (MaximumLength < 0)
                throw new InvalidOperationException("Maximum lengte kan niet lager zijn dan 0.");

            if (MaximumLength < MinimumLength)
                throw new InvalidOperationException("Minimum lengte kan niet hoger zijn dan de maximum lengte");
        }

        public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
        {
            var adapt = new StringLengthAttributeAdapter(metadata, context, this);
            return adapt.GetClientValidationRules();
        }
    }
}