asp.net MVC DataAnnotations

Question

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I have created a custom ValidateAttribute for my ViewModel

i created it for validate properties which depend from another property of ViewModel

if (user checked "01" or "09" from QrupList) Then

Company name is needed
Name,surname and LastName are not needed

else

Company name is not needed
Name,surname and LastName are needed

I have ViewModel as below

[ValidateForGroupAttribute("Group", "CompanyName")]
public partial class AbonentViewModel
{      
    [DisplayName("Şirkət")]
    public string CompanyName { get; set; }

    [DisplayName("Soyadı")]
    [Required(ErrorMessage = "Soyadı vacibdir")]
    public string Surname { get; set; }      

    [DisplayName("Qrup")]
    [Required(ErrorMessage = "Qrup vacibdir")]
    public string Group{ get; set; }

    public SelectList GroupList { get; set; }
}

My custom ValidationAttribute classes:

[AttributeUsage(AttributeTargets.Class, AllowMultiple = true, Inherited = true)]
public sealed class ValidateForGroupAttribute : ValidationAttribute
{
    private const string _defaultErrorMessage = "'{0}' a müvafiq '{1}' daxil din";

    public ValidateForGroupAttribute(string originalProperty, string confirmPropertyCompany)
        : base(_defaultErrorMessage)
    {
        OriginalProperty = originalProperty;
        ConfirmPropertyCompany = confirmPropertyCompany;
    }

    public string OriginalProperty { get; private set; }

    public override string FormatErrorMessage(string name)
    {
        return String.Format(CultureInfo.CurrentUICulture, ErrorMessageString,
            OriginalProperty, ConfirmPropertyCompany);
    }

    public override bool IsValid(object value)
    {
        PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(value);
        object originalValue = properties.Find(OriginalProperty, true).GetValue(value);
        object confirmValueCompany = properties.Find(ConfirmPropertyCompany, true).GetValue(value);

        if ((string)originalValue == "01" || (string)originalValue == "09")
            return false;
        else
            return true;
    }
}

How do I do it? What is wrong in my ValidationAttributes?

Dai Bok · Accepted Answer · 2010-12-02 15:39:07Z

2

We looked at validation using data annotations a few months back, and decided it was better to use something like fluent validation, as we had complex business rules and logic that would have taken too much effort to realise with data annotations. Have a look at the documentation, and you will see fluent validation makes things like this easy.

Sorry, I did not get back sooner: Check fluent validation here

Your rule could look something like. Syntax not tested, but I am sure you will be able to figure it out.

public class AbonentViewModelValidator : AbstractValidator<AbonentViewModel> {
    public AbonentViewModelValidator() {
        RuleFor(model => model.CompanyName).NotEmpty().When(model => (model.GroupList.Id == 1 || model.GroupList.Id == 9 ));
        RuleFor(model => model.Surname).NotEmpty().When(model => (model.GroupList.Id != 1 || model.GroupList.Id != 9 ));
        RuleFor(model => model.Name).NotEmpty().When(model => (model.GroupList.Id != 1 || model.GroupList.Id != 9 ));
    }
}

edited Dec 2, 2010 at 15:39

answered Dec 2, 2010 at 8:26

Dai Bok

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3 Comments

AEMLoviji Over a year ago

can you give me some link for documentation?

AEMLoviji Over a year ago

thanks i will test it. i have done it with another way. Some cheks are making by DataAnnotation after it by my simple validator in controller. but i will test your code too. i do not liked my way yet:-).

AEMLoviji Over a year ago

it is good library.but do not want use it. maybe another time i will use it. Thanks for your response

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