asp.net mvc input / model validation multi language

Question

I\'m quite new to asp.net mvc, and right know I\'m trying to find out a good practise to do input validation.

In the project we\'re going to use entity framework, wh

Answer 1

Phil Haack has written a good blog post that covers how to do this. Essentially it is much the same except you use resource files to provide the messages.

[Required(ErrorMessageResourceType = typeof(Resources), ErrorMessageResourceName = Required")]
public string MyProperty{ get; set; }

Answer 2

You can inherit custom attribute from RequiredAttribute and set your own localized message for property ErrorMessage. It can looks like this:

public class LocalizedRequiredAttribute : RequiredAttribute
{
    public LocalizedRequiredAttribute()
        : base()
    {
        // prefix for the selection of localized messages from datebase
        // e.x. for "Required" string, localized messages will be: "RuRequired", "EnRequired"
        var currentCulture = CultureInfo.CurrentCulture.TwoLetterISOLanguageName;

        // logic to get value from datebase
        // e.x. using Linq2Sql
        using (var context = new dateBaseContext())
        {
            var query = (from x in context.LocalizedStrings
                         where x.NameKey == currentCulture + "Required"
                         select x.NameValue).SingleOrDefault();

            if (query != null)
            {
                base.ErrorMessage = query;
            }
            else
            {
                base.ErrorMessage = "UndefinedName";
            }
        }            

    }
}

also and you inherit from DisplayNameAttribute and override DisplayName property:

public class LocalizedDisplayNameAttribute : DisplayNameAttribute
{
    public LocalizedDisplayNameAttribute(string displayNameKey)
        : base(displayNameKey)
    {
    }

    public override string DisplayName
    {
        get
        {
            if (!string.IsNullOrEmpty(base.DisplayName))
            {
                // prefix for the selection of localized messages from datebase
                // e.x. if DisplayName is "Country", localized messages will be: "RuCountry", "EnCountry"
                var currentCulture = CultureInfo.CurrentCulture.TwoLetterISOLanguageName;

                // logic to get value from datebase
                // e.x. using Linq2Sql
                using (var context = new dateBaseContext())
                {
                    var query = (from x in context.DisplayNames
                                 where x.DisplayNameKey == currentCulture + base.DisplayName
                                 select x.DisplayNameValue).SingleOrDefault();

                    if (query != null)
                    {
                        return query;
                    }

                    return base.DisplayName;
                }
            }

            return "UndefinedName";
        }
    }
}

also you can create your custom validation attributes that inherits from ValidationAttribute class.

Answer 3

Take a look at this post, http://helios.ca/2010/02/17/asp-net-mvc-2-model-validation-with-localization/ good blog on the problem