ASP MVC: Custom Validation Attribute

Question

I\'m trying to write my own Custom Validation attribute but I\'m having some problems.

The attribute I\'m trying to write is that when a user logs in, the password w

Answer 1

just as an example:

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

 namespace GDNET.Web.Mvc.Validation
 {
[AttributeUsage(AttributeTargets.Field | AttributeTargets.Property, AllowMultiple = false, Inherited = true)]
public sealed class ValidatePasswordLengthAttribute : ValidationAttribute, IClientValidatable
{
    private const string defaultErrorMessage = "'{0}' must be at least {1} characters long.";
    private readonly int minRequiredPasswordLength = Membership.Provider.MinRequiredPasswordLength;

    public ValidatePasswordLengthAttribute()
        : base(defaultErrorMessage)
    {
    }

    public override string FormatErrorMessage(string name)
    {
        return String.Format(CultureInfo.CurrentCulture, ErrorMessageString, name, minRequiredPasswordLength);
    }

    public override bool IsValid(object value)
    {
        string valueAsString = value as string;
        return (valueAsString != null && valueAsString.Length >= minRequiredPasswordLength);
    }

    public IEnumerable GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
    {
        return new[]
        {
            new ModelClientValidationStringLengthRule(FormatErrorMessage(metadata.GetDisplayName()), minRequiredPasswordLength, int.MaxValue)
        };
    }
}
  }

source: https://code.google.com/p/gdnetprojects/source/browse/trunk/Experiments/Common/GDNET.Web.Mvc/Validation/ValidatePasswordLengthAttribute.cs?r=69