我想验证一个类装饰着数据标注的Validator类。

I'm trying to validate a class decorated with data annotation with the Validator class.

在属性应用于同一类，它工作正常。但是，当我尝试使用元数据类这是行不通的。有什么我应该做的，因此使用元数据类的验证？下面是一些code ..

It works fine when the attributes are applied to the same class. But when I try to use a metadata class it doesn't work. Is there anything I should do with the Validator so it uses the metadata class? Here's some code..

本作品：

public class Persona
    {
        [Required(AllowEmptyStrings = false, ErrorMessage = "El nombre es obligatorio")]
        public string Nombre { get; set; }

        [Range(0, int.MaxValue, ErrorMessage="La edad no puede ser negativa")]
        public int Edad { get; set; }
}

这不工作：

[MetadataType(typeof(Persona_Validation))]
    public class Persona
    {        
        public string Nombre { get; set; }

        public int Edad { get; set; }        

    }

    public class Persona_Validation
    {
        [Required(AllowEmptyStrings = false, ErrorMessage = "El nombre es obligatorio")]
        public string Nombre { get; set; }

        [Range(0, int.MaxValue, ErrorMessage = "La edad no puede ser negativa")]
        public int Edad { get; set; }
    }

这是我如何验证实例：

ValidationContext context = new ValidationContext(p, null, null);
            List<ValidationResult> results = new List<ValidationResult>();

            bool valid = Validator.TryValidateObject(p, context, results, true);

感谢。

推荐答案

我找到了答案在这里：http://forums.silverlight.net/forums/p/149264/377212.aspx

MVC识别MetaDataType属性，但其他项目则没有。验证之前，您需要手动注册的元数据类：

MVC recognizes the MetaDataType attribute, but other projects do not. Before validating, you need to manually register the metadata class:

TypeDescriptor.AddProviderTransparent(
            new AssociatedMetadataTypeTypeDescriptionProvider(typeof(Persona), typeof(Persona_Validation)), typeof(Persona));

ValidationContext context = new ValidationContext(p, null, null);
List<ValidationResult> results = new List<ValidationResult>();

bool valid = Validator.TryValidateObject(p, context, results, true);