asp.net-mvc-4 - 必需属性的数据注释

Question

首先，它可以工作，但今天却失败了!

这是我定义date属性的方式:

[Display(Name = "Date")]
[Required(ErrorMessage = "Date of Submission is required.")]        
[DisplayFormat(DataFormatString = "{0:d}", ApplyFormatInEditMode = true)]
[DataType(DataType.Date)]
public DateTime TripDate { get; set; }

它过去一直在工作。但是今天，当我调用相同的ApiController Action 时:

[HttpPost]
public HttpResponseMessage SaveNewReport(TripLeaderReportInputModel model)

Firebug报告:

ExceptionMessage:

"Property 'TripDate' on type 'Whitewater.ViewModels.Report.TripLeaderReportInputModel' 
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"

发生了什么？那些不是 [DataContract]的 WCF吗？我正在 REST WebAPI中使用 MVC4!

有人可以帮忙吗？请？

-更新-

我发现了一些类似的链接。

MvC 4.0 RTM broke us and we don't know how to fix it RSS

---再次更新---

这是HTTP响应 header :

Cache-Control   no-cache
Connection  Close
Content-Length  1846
Content-Type    application/json; charset=utf-8
Date            Thu, 06 Sep 2012 17:48:15 GMT
Expires         -1
Pragma          no-cache
Server          ASP.NET Development Server/10.0.0.0
X-AspNet-Version    4.0.30319

请求 header :

Accept          */*
Accept-Encoding gzip, deflate
Accept-Language en-us,en;q=0.5
Cache-Control   no-cache
Connection          keep-alive
Content-Length  380
Content-Type    application/x-www-form-urlencoded; charset=UTF-8
Cookie          .ASPXAUTH=1FF35BD017B199BE629A2408B2A3DFCD4625F9E75D0C58BBD0D128D18FFDB8DA3CDCB484C80176A74C79BB001A20201C6FB9B566FEE09B1CF1D8EA128A67FCA6ABCE53BB7D80B634A407F9CE2BE436BDE3DCDC2C3E33AAA2B4670A0F04DAD13A57A7ABF600FA80C417B67C53BE3F4D0EACE5EB125BD832037E392D4ED4242CF6
DNT                 1
Host            localhost:39019
Pragma          no-cache
Referer         http://localhost:39019/Report/TripLeader
User-Agent          Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/20100101 Firefox/15.0
X-Requested-With    XMLHttpRequest

-更新-

我找到了一个临时解决方案。请参阅下面的答案。如果有人知道它为什么起作用或有更好的解决方案，请发表您的答案。谢谢。

Answer 1

好的。虽然我还没有完全理解这件事。找到了解决方法。

在Global.asax中:

GlobalConfiguration.Configuration.Services.RemoveAll(
    typeof(System.Web.Http.Validation.ModelValidatorProvider),
    v => v is InvalidModelValidatorProvider);

我在aspnetwebstack的问题跟踪器中找到了它。这是页面的链接:

Overly aggressive validation for applying [DataMember(IsRequired=true)] to required properties with value types

如果有人可以告诉我们为什么会这样，请发表您的见解作为答案。谢谢。