validation - Mvc4 RTM 验证抛出错误

Question

关于模型验证的 rtm 位发生了一些变化。

我有一个简单的 View 模型，看起来像

    public class ProductViewModel
    { 
    [Required]
    [DataMember(IsRequired = true)]
    public int ProductTypeId { get; set; }
    public string Product { get; set; }
    }

(我刚刚添加了 DataMember(IsRequired = true) 作为我收到的错误消息说使用它来解决问题。但是没有乐趣)

在我的 Controller 中，模型状态告诉我模型是有效的，但是当我尝试使用 RestSharp 将模型传递给我的 api 时，我收到以下错误。

{"Message":"An error has occurred.","ExceptionMessage":"Property 'ProductTypeId' on type 'Mine.Model.Model' is invalid. Value-typed properties marked as [Required] must also be marked with [DataMember(IsRequired=true)] to be recognized as required. Consider attributing the declaring type with [DataContract] and the property with [DataMember(IsRequired=true)].","ExceptionType":"System.InvalidOperationException","StackTrace":" at System.Web.Http.Validation.Validators.ErrorModelValidator.Validate(ModelMetadata metadata, Object container)\r\n at System.Web.Http.Validation.DefaultBodyModelValidator.ShallowValidate(ModelMetadata metadata, ValidationContext validationContext, Object container)\r\n at System.Web.Http.Validation.DefaultBodyModelValidator.ValidateNodeAndChildren(ModelMetadata metadata, ValidationContext validationContext, Object container)\r\n at System.Web.Http.Validation.DefaultBodyModelValidator.ValidateProperties(ModelMetadata metadata, ValidationContext validationContext)\r\n at System.Web.Http.Validation.DefaultBodyModelValidator.ValidateNodeAndChildren(ModelMetadata metadata, ValidationContext validationContext, Object container)\r\n at System.Web.Http.Validation.DefaultBodyModelValidator.Validate(Object model, Type type, ModelMetadataProvider metadataProvider, HttpActionContext actionContext, String keyPrefix)\r\n at System.Web.Http.ModelBinding.FormatterParameterBinding.<>c_DisplayClass1.b_0(Object model)\r\n at System.Threading.Tasks.TaskHelpersExtensions.<>c__DisplayClass361.<>c__DisplayClass38.<Then>b__35()\r\n at System.Threading.Tasks.TaskHelpersExtensions.<>c__DisplayClass49.<ToAsyncVoidTask>b__48()\r\n at System.Threading.Tasks.TaskHelpers.RunSynchronously[TResult](Func1 func, CancellationToken cancellationToken)"}

我的 rc 位没有这个问题，但后来我才开始使用带有 rtm 位的 restsharp 库。

任何帮助都会很棒。

Answer 1

除了将 [DataMember(IsRequired = true)] 添加到属性之外，您还需要确保在类级别应用属性 [DataContract]。