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POCan ASP.Net MVC 2 Custom attributes on class level and on property level be active in the same time?
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copied!<p>I am working on asp.net mvc 2 web application. I have model with 3 properties:</p> <pre><code>[IsCityInCountry("CountryID", "CityID"] public class UserInfo { [Required] public int UserID { get; set; } [Required] public int CountryID { get; set; } [Required] public int CityID { get; set; } } </code></pre> <p>I have one "required" property attribute, and one attribute on class level :</p> <pre><code>using System; using System.ComponentModel; using System.ComponentModel.DataAnnotations; [AttributeUsage(AttributeTargets.Class, AllowMultiple = true, Inherited = true)] public class IsCityInCountry : ValidationAttribute { public IsCityInCountry(string countryIDProperty, string cityIDProperty) { CountryIDProperty = countryIDProperty; CityIDProperty = cityIDProperty; } public string CountryIDProperty { get; set; } public string CityIDProperty { get; set; } public override bool IsValid(object value) { var properties = TypeDescriptor.GetProperties(value); var countryID = properties.Find(CountryIDProperty, true).GetValue(value); var cityID = properties.Find(CityIDProperty , true).GetValue(value); int countryIDInt; int.TryParse(countryID.ToString(), out countryIDInt); int cityIDInt; int.TryParse(cityID.ToString(), out cityIDInt); if (CountryBusiness.IsCityInCountry(countryIDInt, cityIDInt)) { return true; } return false; } } </code></pre> <p>When I post the form on my view, and CountryID is not entered, in ModelState dictionary there's an error about that issue. Other attribute is ignored ("IsCityInCountry"). When I choose CountryID and CityID, which is not in selected country, I get appropriate validation message about that, and ModelState has another key (which is ""). I understand that advantage have property attributes and then class attributes. My question; is there any way to get all validation messages at the same time, no matter what kind of attributes are involved (class or property attributes)? Thanks in advance.</p>

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