C# 使用 Validator 类验证 DataAnnotations
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Validating DataAnnotations with Validator class
提问by Pablote
I'm trying to validate a class decorated with data annotation with the Validator class.
我正在尝试使用Validator class 验证用数据注释修饰的类。
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..
当属性应用于同一个类时，它工作正常。但是当我尝试使用元数据类时它不起作用。我应该对 Validator 做些什么以便它使用元数据类？这是一些代码..
this works:
这有效：
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; }
}
this doesnt work:
这不起作用：
[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; }
}
this is how I validate the instances:
这就是我验证实例的方式：
ValidationContext context = new ValidationContext(p, null, null);
List<ValidationResult> results = new List<ValidationResult>();
bool valid = Validator.TryValidateObject(p, context, results, true);
thanks.
谢谢。
采纳答案by Jeremy Gruenwald
I found the answer here: http://forums.silverlight.net/forums/p/149264/377212.aspx
我在这里找到了答案：http: //forums.silverlight.net/forums/p/149264/377212.aspx
MVC recognizes the MetaDataType attribute, but other projects do not. Before validating, you need to manually register the metadata class:
MVC 识别 MetaDataType 属性，但其他项目不识别。在验证之前，您需要手动注册元数据类：
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);
回答by Dzejms
Try to move the metadata class into the same namespace as the Persona class if it isn't already. I was having similar problems and moving my metadata class into the same namespace as the L2S model class worked for me.
如果尚未将元数据类移动到与 Persona 类相同的命名空间中，请尝试将其移动。我遇到了类似的问题，并将我的元数据类移动到与 L2S 模型类为我工作的相同命名空间中。
