Entity framework WCF OData服务和EF 6问题-Can和x27；t使用Odata服务公开实体

我正在将WCF数据服务（Odata）与.NETFramework 4.5.1和EF6.1一起使用。我使用了代码优先的方法来创建EF模型。当我将此EF模型（AddProjectModel.cs）引用到WCF OData服务（WcfDataService1.svc）时，它抛出以下错误：

错误：

服务器在处理请求时遇到错误。异常消息为“在数据上下文类型“AddProjectModel”上”，有一个顶级IQueryable属性“Assets”，其元素类型不是实体类型。确保IQueryable属性为实体类型，或指定数据上下文类型上的IgnoreProperties属性以忽略此属性。“。有关详细信息，请参阅服务器日志。异常堆栈跟踪为：

位于System.Data.Services.Providers.ReflectionServiceProvider.PopulateMetadata（ProviderMetadataCacheItem metadataCacheItem）的System.Data.Services.Providers.BaseServiceProvider.LoadMetadata（布尔skipServiceOperations）的System.Data.Services.DataService

1.CreateInternalProvider（对象数据源实例）在System.Data.Services.DataService

1.CreateMataAndQueryProviders（IDataServiceMetadataProvider&metadataProviderInstance，IDataServiceQueryProvider&queryProviderInstance，Object&dataSourceInstance，Boolean&isInternallyCreatedProvider）的System.Data.Services.DataService

1.CreateProvider（）在System.Data.Services.DataService处的System.Data.Services.DataService处的System.Data.Services.DataService处的System.HandlerRequest（）处的

1.ProcessRequestFormMessage（Stream messageBody）处的SyncInvokeProcessRequestFormMessage（Object，Object[]，Object[]）处的System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoker（Object实例，Object[]输入，Object[]输出）在System.ServiceModel.Dispatcher.Dispatcher.DispatcheOperationRuntime.InvokeBegin（MessageRpc&rpc）在System.ServiceModel.Dispatcher.ImmutableDispatcheRuntime.ProcessMessage5（MessageRpc&rpc）在System.ServiceModel.Dispatcher.ImmutableDispatcheRuntime.ProcessMessage4在System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31（MessageRpc&rpc）在System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage3（MessageRpc&rpc）在System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage2（MessageRpc&rpc）在System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage11（MessageRpc&rpc）在System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage1（MessageRpc&rpc）在System.ServiceModel.Dispatcher.MessageRpc.Process（布尔等操作上下文集）

这是我的WCF数据服务：WcfDataService1.svc

namespace AddProjectService
{
 public class WcfDataService1 : DataService<AddProjectModel>
 {
    // This method is called only once to initialize service-wide policies.
    public static void InitializeService(DataServiceConfiguration config)
    {
        // TODO: set rules to indicate which entity sets and service operations are visible,
         updatable, etc.
        // Examples:
        config.SetEntitySetAccessRule("*", EntitySetRights.AllRead);
        config.SetServiceOperationAccessRule("*", ServiceOperationRights.All);
        config.DataServiceBehavior.MaxProtocolVersion = DataServiceProtocolVersion.V3;
    }
 }
}

我不知道如何解决这个问题。你能告诉我我这里缺少什么吗

我正在使用oracle数据库，最近我们从devart购买了oracle dotConnect的许可证

谢谢

---

嗨

我已通过在每个POCO类上设置具有主键的[DataServiceKey]属性来解决此错误。请参阅：

现在我可以通过Odata服务公开实体，但当我尝试通过键入URL（例如..../WcfDataService1.svc/Assets）访问实体集合时，它会引发以下错误：

错误：

 <?xml version="1.0" encoding="utf-8" ?> 
 <m:error xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata">
   <m:code /> 
   <m:message xml:lang="en-US">An error occurred while processing this request.</m:message> 
   <m:innererror>
     <m:message>Operation could destabilize the runtime.</m:message> 
     <m:type>System.Security.VerificationException</m:type> 
     <m:stacktrace>at queryable_reader(Object ) at   System.Data.Services.Providers.ReflectionServiceProvider.GetQueryRootForResourceSet(ResourceSet container) at System.Data.Services.Providers.ReflectionDataServiceProvider.GetQueryRootForResourceSet(ResourceSet resourceSet) at System.Data.Services.Providers.DataServiceProviderWrapper.GetQueryRootForResourceSet(ResourceSetWrapper resourceSet) at System.Data.Services.RequestUriProcessor.ComposeExpressionForEntitySet(SegmentInfo segment, IDataService service, Boolean isLastSegment, Boolean checkRights) at System.Data.Services.RequestUriProcessor.ComposeExpressionForSegments(IList`1 segments, IDataService service, Boolean isCrossReferencingUri) at System.Data.Services.RequestUriProcessor.ProcessRequestUri(Uri absoluteRequestUri, IDataService service, Boolean internalQuery) at System.Data.Services.DataService`1.ProcessIncomingRequestUri() at System.Data.Services.DataService`1.HandleRequest()</m:stacktrace> 
  </m:innererror>
 </m:error>

处理此请求时出错。
操作可能会使运行时不稳定。
System.Security.VerificationException异常
位于System.Data.Services.Providers.ReflectionServiceProvider.GetQueryRootForResourceSet（ResourceSet容器）的System.Data.Services.Providers.ReflectionDataServiceProvider.GetQueryRootForResourceSet（ResourceSet ResourceSet）的System.Data.Services.Providers.DataServiceProviders.GetQueryRootForResourceSet（ResourceSet ResourceSet ResourceSet）的queryable\u阅读器（对象）（ResourceSetWrapper resourceSet）位于System.Data.Services.RequestUriProcessor.ComposeExpressionForEntitySet（SegmentInfo段、IDataService服务、Boolean isLastSegment、Boolean checkRights），位于System.Data.Services.RequestUriProcessor.ComposeExpressionForSegments（IList`1段、IDataService服务、Boolean IsCrossReferenceGuri）System.Data.Services.DataService`1.ProcessIncomingRequestUri（）位于System.Data.Services.DataService`1.ProcessIncomingRequestUri（）处System.Data.Services.DataService`1.HandlerRequest（）处的System.Data.Services.RequestUri.ProcessRequestUri（Uri absoluteRequestUri，IDataService service，Boolean internalQuery）

我如何解决这个问题

---

谢谢，

要在EF6中使用WCF DataService，还有一些额外的工作要做。有关详细信息，请查看以下两篇博文：

通常，您需要执行以下两个步骤：

按照该页面上的指南安装最新的Nuget软件包

将DataService替换为EntityFrameworkDataService，例如在WcfDataService1.svc中：

公共类WcfDataService1:EntityFrameworkDataService

---

我花了6个小时才找到这个。

public class Asset
{
 public Asset()
 {
   Projects = new HashSet<Project>();      
 }

 [Key]
 public decimal AssetId { get; set; }

 [StringLength(20)]
 public string AssetNumber { get; set; }

 [StringLength(100)]
 public string Name { get; set; }

 public decimal? AssetLevelId { get; set; }

 public decimal? AssetTypeId { get; set; }

 public virtual ICollection<Project> Projects { get; set; }    
}

public class Project
{
 public Project()
 {      
 } 

 [Key]
 public decimal ProjectId { get; set; }

 public decimal AssetId { get; set; }

 public decimal CapitalCategoryId { get; set; }

 //public decimal ProjectTypeId { get; set; }

 public decimal ProgramCategoryId { get; set; }   

 [StringLength(1024)]
 public string Comments { get; set; }

 public decimal ImplementerId { get; set; }

 public decimal StatusId { get; set; }

 public decimal DsfId { get; set; }

 [StringLength(20)]
 public string FMSNumber { get; set; }

 [StringLength(1024)]
 public string JobDescription { get; set; }

 [StringLength(2)]
 public string JobType { get; set; }

 public decimal OrganizationId { get; set; }

 [Required][StringLength(1)]
 public string IsRollover { get; set; }

 [Required][StringLength(1)]
 public string IsDeferred { get; set; }

 [Required][StringLength(1)]
 public string IsApproved { get; set; }

 [StringLength(1)]
 public string IsSidewalkBridge { get; set; }

 public decimal FundingSourceId { get; set; }

 public decimal? DesignationId { get; set; }

 public decimal? DispositionId { get; set; }

 [Required][StringLength(1)]
 public string IsLongTermLease { get; set; }

 public virtual Asset Asset { get; set; }   
}

 <?xml version="1.0" encoding="utf-8" ?> 
 <m:error xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata">
   <m:code /> 
   <m:message xml:lang="en-US">An error occurred while processing this request.</m:message> 
   <m:innererror>
     <m:message>Operation could destabilize the runtime.</m:message> 
     <m:type>System.Security.VerificationException</m:type> 
     <m:stacktrace>at queryable_reader(Object ) at   System.Data.Services.Providers.ReflectionServiceProvider.GetQueryRootForResourceSet(ResourceSet container) at System.Data.Services.Providers.ReflectionDataServiceProvider.GetQueryRootForResourceSet(ResourceSet resourceSet) at System.Data.Services.Providers.DataServiceProviderWrapper.GetQueryRootForResourceSet(ResourceSetWrapper resourceSet) at System.Data.Services.RequestUriProcessor.ComposeExpressionForEntitySet(SegmentInfo segment, IDataService service, Boolean isLastSegment, Boolean checkRights) at System.Data.Services.RequestUriProcessor.ComposeExpressionForSegments(IList`1 segments, IDataService service, Boolean isCrossReferencingUri) at System.Data.Services.RequestUriProcessor.ProcessRequestUri(Uri absoluteRequestUri, IDataService service, Boolean internalQuery) at System.Data.Services.DataService`1.ProcessIncomingRequestUri() at System.Data.Services.DataService`1.HandleRequest()</m:stacktrace> 
  </m:innererror>
 </m:error>