asp.net-mvc-3 - IValidatableObject が mvc 4 Web アプリで機能しない

Question

だから私は、ユーザーとビジネス パートナーを登録している web アプリを持っています。

これは私のモデルがどのように見えるかです

public class UserModel : IValidatableObject
{
   //here are some properties and methods that I am using in Validate method        

    public CompanyModel Company { get; set; } //this is user Company

    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
    {       
         if (this.UserWithEmailExists())
             yield return new ValidationResult("Email already exists", new[] { "Email" });

         if (this.UserWithUsernameExists())
             yield return new ValidationResult("Username already exists", new[] { "Username" });
    }
}

public class CompanyModel : IValidatableObject
{
    //again here are some properties that i am using in Validate

    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
    {
        if (this.Phone == null && this.Mobile == null)
            yield return new ValidationResult("The Phone field is required", new[] { "Phone" });
    }
}

//this is the model passed to the view
public sealed class RegistrationModel : UserModel, IValidatableObject
{
    public new IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
    {
        if (this.Password != this.PasswordValidation)
            yield return new ValidationResult("Ponovite prejšnji vnos", new[] { "PasswordValidation" });
    }
}

問題は次のとおりです。フォームを送信すると、Validate in CompanyModel が呼び出され、Validate in RegistrationModel も呼び出されます。しかし、Validate in UserModel も呼び出されるようにしたい...

更新：最初の問題を解決しました：これらはアップグレード後のモデルです:)

public class UserModel : IValidatableObject
{
   //here are some properties and methods that I am using in Validate method        

    public CompanyModel Company { get; set; } //this is user Company

    public virtual IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
    {       
         if (this.UserWithEmailExists())
             yield return new ValidationResult("Email already exists", new[] { "Email" });

         if (this.UserWithUsernameExists())
             yield return new ValidationResult("Username already exists", new[] { "Username" });
    }
}

public class CompanyModel : IValidatableObject
{
    //again here are some properties that i am using in Validate

    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
    {
        if (this.Phone == null && this.Mobile == null)
            yield return new ValidationResult("The Phone field is required", new[] { "Phone" });
    }
}

//this is the model passed to the view
public sealed class RegistrationModel : UserModel, IValidatableObject
{
    public override new IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
    {
        //this is needed so that UserModel validation executes
        foreach (var result in base.Validate(validationContext))
        {
            yield return result;
        }

        if (this.Password != this.PasswordValidation)
            yield return new ValidationResult("Ponovite prejšnji vnos", new[] { "PasswordValidation" });
    }
}

これで、検証が正常に機能します。CompanyModel の Validate が 2 回実行される理由がわかりません??. なにか提案を？