实体框架 4.1 - ASP.Net MVC 3 EF4.1 代码优先 - 不支持每种类型有多个对象集

Question

我想使用单元可测试的 EF 4.1 代码优先模式。我遵循了本文答案中说明的代码示例。但是现在我收到一个错误，指出"不支持每种类型的多个对象集"。我也在使用最新的 IoC 结构图。我不确定如何解决此问题。

每个类型有多个对象集不是 支持。对象集 "成员类型"和"成员类型"可以 两者都包含类型的实例 "SocialSite.Model.Entities.MemberType"。

Line 82: public virtual IEnumerable<T> FindAll()
Line 83: {
Line 84:     return _dbSet.ToList();
Line 85: }
Line 86: 
[InvalidOperationException: Multiple object sets per type are not supported. The     object sets 'MemberTypes' and 'MemberTypes' can both contain instances of type     'SocialSite.Model.Entities.MemberType'.]
   System.Data.Entity.Internal.DbSetDiscoveryService.RegisterSets(DbModelBuilder     modelBuilder) +336
   System.Data.Entity.Internal.LazyInternalContext.CreateModelBuilder() +393
   System.Data.Entity.Internal.LazyInternalContext.CreateModel(LazyInternalContext     internalContext) +22
   System.Data.Entity.Internal.RetryLazy`2.GetValue(TInput input) +117
   System.Data.Entity.Internal.LazyInternalContext.InitializeContext() +407
   System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType) +17
   System.Data.Entity.Internal.Linq.InternalSet`1.Initialize() +62
   System.Data.Entity.Internal.Linq.InternalSet`1.GetEnumerator() +15
   System.Data.Entity.Infrastructure.DbQuery`1.System.Collections.Generic.IEnumerable<TResult>.GetEnumerator() +40
   System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) +315
   System.Linq.Enumerable.ToList(IEnumerable`1 source) +58
   SocialSite.Data.Repositories.Impl.Repository`1.FindAll() in D:Visual Studio 2010SocialSiteSocialSite.DataRepositoriesImplRepository.cs:84
   SocialSite.Service.Impl.MemberTypesService.GetMemberTypes() in D:Visual Studio 2010SocialSiteSocialSite.ComponentsImplMemberTypesService.cs:23
   SocialSite.Web.Areas.Admin.Controllers.MemberTypesController.ListMemberTypes() in D:Visual Studio 2010SocialSiteSocialSiteAreasAdminControllersMemberTypesController.cs:44
   lambda_method(Closure , ControllerBase , Object[] ) +62
   System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters) +17
   System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +208
   System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +27
   System.Web.Mvc.<>c__DisplayClass15.<InvokeActionMethodWithFilters>b__12() +55
   System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +263
   System.Web.Mvc.<>c__DisplayClass17.<InvokeActionMethodWithFilters>b__14() +19
   System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +191
   System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +343
   System.Web.Mvc.Controller.ExecuteCore() +116
   System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +97
   System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) +10
   System.Web.Mvc.<>c__DisplayClassb.<BeginProcessRequest>b__5() +37
   System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +21
   System.Web.Mvc.Async.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _) +12
   System.Web.Mvc.Async.WrappedAsyncResult`1.End() +62
   System.Web.Mvc.<>c__DisplayClasse.<EndProcessRequest>b__d() +50
   System.Web.Mvc.SecurityUtil.<GetCallInAppTrustThunk>b__0(Action f) +7
   System.Web.Mvc.SecurityUtil.ProcessInApplicationTrust(Action action) +22
   System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +60
   System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +8862381
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +184

不确定如何格式化堆栈跟踪比这更糟糕。

这是有问题的模型。

public class MemberType
{
    [Key]
    public virtual int Id { get; set; }
    [StringLengthAttribute(65, ErrorMessage = "Maximum length 65 characters")]
    public virtual string Name { get; set; }
    public virtual string Description { get; set; }
    public virtual bool Registration { get; set; }
    public virtual bool Enabled { get; set; }
    [TimestampAttribute]
    public virtual byte[] Timestamp { get; set; }
    public virtual bool Activation { get; set; }
    public virtual Guid RoleId { get; set; } // TODO: this should be a complex type of aspnet_Role or atleaset a foriegn key
    public virtual bool Searchable { get; set; }
    public virtual ICollection<MemberTypeProfileFieldGroup> MemberTypeProfileFieldGroups { get; set; }
}

Answer 1

异常表示您的DbContext（或者可能是从上下文中引用的某个类）定义了两次DbSet<MemberType> MemberType。每种类型只能有一个已定义的DbSet。您发布的代码与异常完全无关。当 EF 代码首次浏览DbContext并从可用DbSets创建模型元数据时，将引发异常