DataAnnotations验证和自定义模型绑定器

Question

我有一个接受以下模型的action方法 - LanguagesViewModel:

public class LanguagesViewModel : ViewModelBase
{
 IEnumerable<LanguageItem> Languages { get; set; }
}

public class LanguageItem
{
 [Required]
 public int LanguageId { get; set; }

 [Required]
 public int SpeakingSkillId { get; set; }

 [Required]
 public int WritingSkillId { get; set; }

 [Required]
 public int UnderstandingSkillId { get; set; } 
}

我还有一个自定义模型绑定器将POST数据绑定到IEnumerable<LanguageItem>.

问题是我如何使DataAnnotations验证工作？

Answer 1

我知道的答案非常晚,而且它适用于MVC3.将以下内容添加到模型绑定器BindModel方法的末尾

if (model != null)
{
    System.Web.Mvc.ModelMetadata modelMetadata = ModelMetadataProviders.Current.GetMetadataForType(() => model, model.GetType());
    ModelValidator compositeValidator = ModelValidator.GetModelValidator(modelMetadata, controllerContext);
    foreach (ModelValidationResult result in compositeValidator.Validate(null))
    {                                    
        bindingContext.ModelState.AddModelError(result.MemberName, result.Message);
    }
}