XVal, DataAnnotes throughout the class

Question

I have a full check on obeject and I'm trying to find a better way to handle this.

Given the following class:

public class LetterResponse {
 public Guid Id {get;set;}
 public bool SendBlankCart {get;set;}
 public string ToName {get;set;}
 public string ToAddress {get;set;}
}

I want to use dataannotation and xval to test a class before I save it, but I have a complex check that requires more than one property.

Pseudo:

if SendBlankCart {
 - no validation on ToName, ToAddress 
} else {
 ToName - required.
 ToAddress - required. 
}

I would like to comment as follows:

[LetterResponseValidator]
public class LetterResponse {
 public Guid Id {get;set;}
 public bool SendBlankCart {get;set;}
 public string ToName {get;set;}
 public string ToAddress {get;set;}
}

and execute the validation rule as follows:

public class LetterResponseValidator : ValidationAttribute
    {
        public override bool IsValid(object value)
        {
            if (value.GetType() == typeof(LetterResponse))
            {
                var letterResponse = (letterResponse) value;
                if (letterResponse.SendBlankCard)
                {
                    return true;
                } else
                {
                    if (string.IsNullOrEmpty(letterResponse.FromDisplayName) || string.IsNullOrEmpty(letterResponse.ToAddress1))
                    {
                        return false;
                    }
                    return true;
                }

            }
            return false;
        }
    }

I expect this parameter to be my instance of the LetterResponse class, but will it never be called in my validation runner?

Does anyone know a way to handle this?

Thanks,

Hal

Answer 1

, , . , "ToName" , .

, , , , modelbinder DataAnnotationsModelBinder Global.asax.cs:

ModelBinders.Binders.DefaultBinder = new DataAnnotationsModelBinder();

.