Question

我有一个使用自定义验证器的模型类，如下面的代码所示。

public class Model1
{
     [ApplicationIdentifierValidator()]
     public Guid ApplicationIdentifier { get; set; }

     public string ApplicationName { get; set; }
     public string ApplicationType { get; set; }
}

public class ApplicationIdentifierValidator: ValidationAttribute
{
    public ApplicationIdentifierValidator() { }

    protected override ValidationResult IsValid(object value, ValidationContext context)
    {
        Model1 model = (Model1)(context.ObjectInstance);
        Guid ApplicationIdentifier = model.ApplicationIdentifier;

        // Validate ApplicationIdentifier value

        return ValidationResult.Success;
    }
}

现在我添加了另一个需要使用相同验证器的模型类。

public class Model2
{
     [ApplicationIdentifierValidator()]
     public Guid ApplicationIdentifier { get; set; }

     public Guid SystemIdentifier { get; set; }
}

问题是当在Model2的上下文中使用ApplicationIdentifierValidator时，它在转换为Model1时抛出异常

Model1 model = (Model1)(context.ObjectInstance);

任何想法可以更好地重用同一验证器吗？

Answer 1

您可以使用继承。基本的OO设计应该满足您的确切需求。通过让您的两个模型继承自ModelBase，您的验证代码可以将对象强制转换为ModelBase并使用共享属性。

abstract class ModelBase{
     [ApplicationIdentifierValidator()]
     public Guid ApplicationIdentifier { get; set; }
}

class Model1: ModelBase{
 public string ApplicationName { get; set; }
 public string ApplicationType { get; set; }
}

class Model2: ModelBaes{
  public Guid SystemIdentifier { get; set; }
}

public class ApplicationIdentifierValidator: ValidationAttribute
{
    public ApplicationIdentifierValidator() { }

    protected override ValidationResult IsValid(object value, ValidationContext context)
    {
        ModelBase model = (ModelBase)(context.ObjectInstance);
        Guid ApplicationIdentifier = model.ApplicationIdentifier;

        // Validate ApplicationIdentifier value

        return ValidationResult.Success;
    }
}

如何在两个不同的模型中使用相同的验证器

1 个答案: