Read value of another property in asp.net mvc2 custom attribute?

Question

I have made custom attribute in my asp.net mvc2 project:

[AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = false)]
public class IsUsernameValidAttribute : ValidationAttribute
{
    public override bool IsValid(object value)
    {
        if (value == null)
        {
            return true;
        }

        var username = value.ToString();

        return UserBusiness.IsUsernameValid(username) 
// && value of OtherProperty == true;
    }
}

for the model:

public class MyClass
{
    [IsUsernameValid]
    public string UserName { get; set; }

    public bool OtherProperty { get; set; }
}

I can get value of UserName, but can I get value of OtherProperty inside custom attribute and use it in return clause and how. Thanks in advance.

Have you tried overriding the IsValid(Object, ValidationContext) overload instead? — svick
– svick, Commented Sep 4, 2011 at 22:04
Well, I want bool as return value, this overload has ValidationContext return value... Any other help?? — Cemsha
– Cemsha, Commented Sep 5, 2011 at 17:13
Are you sure you cannot use following code for validation: public override ValidationResult IsValid(object value, ValidationContext context) { var user = context.ObjectInstance as MyClass; bool result = ... // Your validation logic here return result ? ValidationResult.Success : new ValidationResult(FormatErrorMessage(context.DisplayName)); } — STO
– STO, Commented Sep 5, 2011 at 20:05
When I use "public override ValidationResult IsValid(object value, ValidationContext context)", context is null.... — Cemsha
– Cemsha, Commented Sep 5, 2011 at 22:35

TheCodeKing · Accepted Answer · 2011-09-05 19:43:14Z

1

The only way to do this is with a class level attribute. This is often used for validating the Password and PasswordConfirmation fields during registration.

Grab some code from there as a starting point.

[AttributeUsage(AttributeTargets.Class)]
public class MatchAttribute : ValidationAttribute
{
   public override Boolean IsValid(Object value)
   {
        Type objectType = value.GetType();

        PropertyInfo[] properties = objectType.GetProperties();

        ...
   }
}

answered Sep 5, 2011 at 19:43

TheCodeKing

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