Azure WebSites或Azure云服务上的MVC4 API ：’System.ComponentModel.DataAnnotations.Schema.DatabaseGeneratedOption’

当我尝试将我的Web API项目部署到Azure上的Cloud WebSites和Cloud Hosted Services时，我收到此错误：

"{"ExceptionType":"System.TypeLoadException","Message":"Could not load type 'System.ComponentModel.DataAnnotations.Schema.DatabaseGeneratedOption' from assembly 'System.ComponentModel.DataAnnotations, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'.","StackTrace":"rnServer stack trace: rn at System.Reflection.RuntimeAssembly.GetExportedTypes(RuntimeAssembly assembly, ObjectHandleOnStack retTypes)rn at System.Reflection.RuntimeAssembly.GetExportedTypes()rn at System.Web.Http.Dispatcher.DefaultHttpControllerTypeResolver.GetControllerTypes(IAssembliesResolver assembliesResolver)rn at System.Web.Http.WebHost.WebHostHttpControllerTypeResolver.GetControllerTypes(IAssembliesResolver assembliesResolver)rn at System.Web.Http.Dispatcher.HttpControllerTypeCache.InitializeCache()rn at System.Lazy`1.CreateValue()rnrnException rethrown at [0]: rn at System.Reflection.RuntimeAssembly.GetExportedTypes(RuntimeAssembly assembly, ObjectHandleOnStack retTypes)rn at System.Reflection.RuntimeAssembly.GetExportedTypes()rn at System.Web.Http.Dispatcher.DefaultHttpControllerTypeResolver.GetControllerTypes(IAssembliesResolver assembliesResolver)rn at System.Web.Http.WebHost.WebHostHttpControllerTypeResolver.GetControllerTypes(IAssembliesResolver assembliesResolver)rn at System.Web.Http.Dispatcher.HttpControllerTypeCache.InitializeCache()rn at System.Lazy`1.CreateValue()rn at System.Lazy`1.LazyInitValue()rn at System.Web.Http.Dispatcher.DefaultHttpControllerSelector.InitializeControllerInfoCache()rn at System.Lazy`1.CreateValue()rnrnException rethrown at [1]: rn at System.Web.Http.Dispatcher.DefaultHttpControllerSelector.SelectController(HttpRequestMessage request)rn at System.Web.Http.Dispatcher.HttpControllerDispatcher.SendAsyncInternal(HttpRequestMessage request, CancellationToken cancellationToken)rn at System.Web.Http.Dispatcher.HttpControllerDispatcher.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)"}" 

这里只是消息：

 "Could not load type 'System.ComponentModel.DataAnnotations.Schema.DatabaseGeneratedOption' from assembly 'System.ComponentModel.DataAnnotations, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'." 

当我尝试从远程站点点击任何API时，就会发生这种情况。 我知道它不是我的500错误，因为我的一些API不会抛出它们而不管发生了什么。

有一点需要注意，我不确定这是否会影响任何事情是我开始这个针对.NET 4.5的项目，但后来当Azure网站表示他们不支持4.5时将其切换到4.0。

除了这个链接，我找不到任何相关信息： http ： //support.appharbor.com/discussions/problems/4822-internal-server-error-500-mvc-4-web-api

除了那家伙正在使用app-harbour，andeven仍然没有解决方案。 谢谢你的帮助。