我一直试图修复此错误一段时间。
每当我的应用程序尝试创建数据上下文的实例时，我都会收到此错误。
以下是代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using RandomRentals.Models;
using System.Data.Entity;
namespace RandomRentals.Models
{
public class RentalContext : DbContext
{
public DbSet<Rental> Rentals { get; set; }
public DbSet<Category> Categories { get; set; }
public DbSet<Item> Items { get; set; }
public DbSet<Billing> Billings { get; set; }
public DbSet<User> Users { get; set; }
public DbSet<Video> Videos { get; set; }
public DbSet<Picture> Pictures { get; set; }
public DbSet<ServiceType> ServiceTypes { get; set; }
public DbSet<Rating> Ratings { get; set; }
public DbSet<Business> Businesses { get; set; }
public DbSet<BusinessHour> BusinessHours { get; set; }
}
}
这是堆栈跟踪：
[InvalidOperationException: The type 'RandomRentals.Rental' was not mapped. Check that the type has not been explicitly excluded by using the Ignore method or NotMappedAttribute data annotation. Verify that the type was defined as a class, is not primitive, nested or generic, and does not inherit from EntityObject.]
System.Data.Entity.Internal.DbSetDiscoveryService.GetSets() +706
System.Data.Entity.Internal.DbSetDiscoveryService.InitializeSets() +31
System.Data.Entity.DbContext.DiscoverAndInitializeSets() +56
System.Data.Entity.DbContext.InitializeLazyInternalContext(IInternalConnection internalConnection, DbCompiledModel model) +79
System.Data.Entity.DbContext..ctor() +99
RandomRentals.Models.RentalContext..ctor() +44
RandomRentals.Models.UserModel..ctor() in C:\Users\nikka\Desktop\RandomRentals\RandomRentals\Models\UserModel.cs:11
[TargetInvocationException: Exception has been thrown by the target of an invocation.]
System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck) +0
System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache) +98
System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean skipCheckThis, Boolean fillCache) +241
System.Activator.CreateInstance(Type type, Boolean nonPublic) +69
System.Web.Mvc.DefaultModelBinder.CreateModel(ControllerContext controllerContext, ModelBindingContext bindingContext, Type modelType) +199
System.Web.Mvc.DefaultModelBinder.BindComplexModel(ControllerContext controllerContext, ModelBindingContext bindingContext) +572
System.Web.Mvc.DefaultModelBinder.BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) +449
System.Web.Mvc.ControllerActionInvoker.GetParameterValue(ControllerContext controllerContext, ParameterDescriptor parameterDescriptor) +317
System.Web.Mvc.ControllerActionInvoker.GetParameterValues(ControllerContext controllerContext, ActionDescriptor actionDescriptor) +117
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() +8970061
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +184
以下是完整的错误文字：
未映射“RandomRentals.Rental”类型。使用Ignore方法或NotMappedAttribute数据批注检查未明确排除类型。验证类型是否已定义为类，不是原始类，嵌套类还是通用类，并且不从EntityObject继承。
编辑：租赁类代码。
[EdmEntityTypeAttribute(NamespaceName="DevelopmentModel", Name="Rental")]
[Serializable()]
[DataContractAttribute(IsReference=true)]
public partial class Rental：EntityObject { #region工厂方法
/// <summary>
/// Create a new Rental object.
/// </summary>
/// <param name="rentalID">Initial value of the RentalID property.</param>
/// <param name="agreedPrice">Initial value of the AgreedPrice property.</param>
/// <param name="rentedOn">Initial value of the RentedOn property.</param>
/// <param name="rentalDays">Initial value of the RentalDays property.</param>
/// <param name="returned">Initial value of the Returned property.</param>
/// <param name="rentedBy">Initial value of the RentedBy property.</param>
/// <param name="returnedOn">Initial value of the ReturnedOn property.</param>
/// <param name="ownerReviewed">Initial value of the OwnerReviewed property.</param>
/// <param name="billingID">Initial value of the BillingID property.</param>
/// <param name="itemID">Initial value of the ItemID property.</param>
/// <param name="categoryDescription">Initial value of the CategoryDescription property.</param>
/// <param name="title">Initial value of the Title property.</param>
public static Rental CreateRental(global::System.Int32 rentalID, global::System.Decimal agreedPrice, global::System.DateTime rentedOn, global::System.Int32 rentalDays, global::System.Boolean returned, global::System.Int32 rentedBy, global::System.DateTime returnedOn, global::System.Boolean ownerReviewed, global::System.Int32 billingID, global::System.Int32 itemID, global::System.String categoryDescription, global::System.String title)
{
Rental rental = new Rental();
rental.RentalID = rentalID;
rental.AgreedPrice = agreedPrice;
rental.RentedOn = rentedOn;
rental.RentalDays = rentalDays;
rental.Returned = returned;
rental.RentedBy = rentedBy;
rental.ReturnedOn = returnedOn;
rental.OwnerReviewed = ownerReviewed;
rental.BillingID = billingID;
rental.ItemID = itemID;
rental.CategoryDescription = categoryDescription;
rental.Title = title;
return rental;
}
#endregion
#region Primitive Properties
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=true, IsNullable=false)]
[DataMemberAttribute()]
public global::System.Int32 RentalID
{
get
{
return _RentalID;
}
set
{
if (_RentalID != value)
{
OnRentalIDChanging(value);
ReportPropertyChanging("RentalID");
_RentalID = StructuralObject.SetValidValue(value);
ReportPropertyChanged("RentalID");
OnRentalIDChanged();
}
}
}
private global::System.Int32 _RentalID;
partial void OnRentalIDChanging(global::System.Int32 value);
partial void OnRentalIDChanged();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=true)]
[DataMemberAttribute()]
public Nullable<global::System.Decimal> ProposedPrice
{
get
{
return _ProposedPrice;
}
set
{
OnProposedPriceChanging(value);
ReportPropertyChanging("ProposedPrice");
_ProposedPrice = StructuralObject.SetValidValue(value);
ReportPropertyChanged("ProposedPrice");
OnProposedPriceChanged();
}
}
private Nullable<global::System.Decimal> _ProposedPrice;
partial void OnProposedPriceChanging(Nullable<global::System.Decimal> value);
partial void OnProposedPriceChanged();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=false)]
[DataMemberAttribute()]
public global::System.Decimal AgreedPrice
{
get
{
return _AgreedPrice;
}
set
{
OnAgreedPriceChanging(value);
ReportPropertyChanging("AgreedPrice");
_AgreedPrice = StructuralObject.SetValidValue(value);
ReportPropertyChanged("AgreedPrice");
OnAgreedPriceChanged();
}
}
private global::System.Decimal _AgreedPrice;
partial void OnAgreedPriceChanging(global::System.Decimal value);
partial void OnAgreedPriceChanged();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=false)]
[DataMemberAttribute()]
public global::System.DateTime RentedOn
{
get
{
return _RentedOn;
}
set
{
OnRentedOnChanging(value);
ReportPropertyChanging("RentedOn");
_RentedOn = StructuralObject.SetValidValue(value);
ReportPropertyChanged("RentedOn");
OnRentedOnChanged();
}
}
private global::System.DateTime _RentedOn;
partial void OnRentedOnChanging(global::System.DateTime value);
partial void OnRentedOnChanged();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=false)]
[DataMemberAttribute()]
public global::System.Int32 RentalDays
{
get
{
return _RentalDays;
}
set
{
OnRentalDaysChanging(value);
ReportPropertyChanging("RentalDays");
_RentalDays = StructuralObject.SetValidValue(value);
ReportPropertyChanged("RentalDays");
OnRentalDaysChanged();
}
}
private global::System.Int32 _RentalDays;
partial void OnRentalDaysChanging(global::System.Int32 value);
partial void OnRentalDaysChanged();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=false)]
[DataMemberAttribute()]
public global::System.Boolean Returned
{
get
{
return _Returned;
}
set
{
OnReturnedChanging(value);
ReportPropertyChanging("Returned");
_Returned = StructuralObject.SetValidValue(value);
ReportPropertyChanged("Returned");
OnReturnedChanged();
}
}
private global::System.Boolean _Returned;
partial void OnReturnedChanging(global::System.Boolean value);
partial void OnReturnedChanged();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=false)]
[DataMemberAttribute()]
public global::System.Int32 RentedBy
{
get
{
return _RentedBy;
}
set
{
OnRentedByChanging(value);
ReportPropertyChanging("RentedBy");
_RentedBy = StructuralObject.SetValidValue(value);
ReportPropertyChanged("RentedBy");
OnRentedByChanged();
}
}
private global::System.Int32 _RentedBy;
partial void OnRentedByChanging(global::System.Int32 value);
partial void OnRentedByChanged();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=false)]
[DataMemberAttribute()]
public global::System.DateTime ReturnedOn
{
get
{
return _ReturnedOn;
}
set
{
OnReturnedOnChanging(value);
ReportPropertyChanging("ReturnedOn");
_ReturnedOn = StructuralObject.SetValidValue(value);
ReportPropertyChanged("ReturnedOn");
OnReturnedOnChanged();
}
}
private global::System.DateTime _ReturnedOn;
partial void OnReturnedOnChanging(global::System.DateTime value);
partial void OnReturnedOnChanged();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=false)]
[DataMemberAttribute()]
public global::System.Boolean OwnerReviewed
{
get
{
return _OwnerReviewed;
}
set
{
OnOwnerReviewedChanging(value);
ReportPropertyChanging("OwnerReviewed");
_OwnerReviewed = StructuralObject.SetValidValue(value);
ReportPropertyChanged("OwnerReviewed");
OnOwnerReviewedChanged();
}
}
private global::System.Boolean _OwnerReviewed;
partial void OnOwnerReviewedChanging(global::System.Boolean value);
partial void OnOwnerReviewedChanged();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=true)]
[DataMemberAttribute()]
public global::System.String RenterFeedback
{
get
{
return _RenterFeedback;
}
set
{
OnRenterFeedbackChanging(value);
ReportPropertyChanging("RenterFeedback");
_RenterFeedback = StructuralObject.SetValidValue(value, true);
ReportPropertyChanged("RenterFeedback");
OnRenterFeedbackChanged();
}
}
private global::System.String _RenterFeedback;
partial void OnRenterFeedbackChanging(global::System.String value);
partial void OnRenterFeedbackChanged();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=false)]
[DataMemberAttribute()]
public global::System.Int32 BillingID
{
get
{
return _BillingID;
}
set
{
OnBillingIDChanging(value);
ReportPropertyChanging("BillingID");
_BillingID = StructuralObject.SetValidValue(value);
ReportPropertyChanged("BillingID");
OnBillingIDChanged();
}
}
private global::System.Int32 _BillingID;
partial void OnBillingIDChanging(global::System.Int32 value);
partial void OnBillingIDChanged();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=false)]
[DataMemberAttribute()]
public global::System.Int32 ItemID
{
get
{
return _ItemID;
}
set
{
OnItemIDChanging(value);
ReportPropertyChanging("ItemID");
_ItemID = StructuralObject.SetValidValue(value);
ReportPropertyChanged("ItemID");
OnItemIDChanged();
}
}
private global::System.Int32 _ItemID;
partial void OnItemIDChanging(global::System.Int32 value);
partial void OnItemIDChanged();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=false)]
[DataMemberAttribute()]
public global::System.String CategoryDescription
{
get
{
return _CategoryDescription;
}
set
{
OnCategoryDescriptionChanging(value);
ReportPropertyChanging("CategoryDescription");
_CategoryDescription = StructuralObject.SetValidValue(value, false);
ReportPropertyChanged("CategoryDescription");
OnCategoryDescriptionChanged();
}
}
private global::System.String _CategoryDescription;
partial void OnCategoryDescriptionChanging(global::System.String value);
partial void OnCategoryDescriptionChanged();
/// <summary>
/// No Metadata Documentation available.
/// </summary>
[EdmScalarPropertyAttribute(EntityKeyProperty=false, IsNullable=false)]
[DataMemberAttribute()]
public global::System.String Title
{
get
{
return _Title;
}
set
{
OnTitleChanging(value);
ReportPropertyChanging("Title");
_Title = StructuralObject.SetValidValue(value, false);
ReportPropertyChanged("Title");
OnTitleChanged();
}
}
private global::System.String _Title;
partial void OnTitleChanging(global::System.String value);
partial void OnTitleChanged();
#endregion
}
非常感谢任何帮助
答案 0 :(得分：10)
我来到这里是因为我遇到了同样的问题，并希望得到答案。但没有快乐！所以我一直在寻找 - 在Pluralsight上有关于实体框架的培训视频。我找到了问题的答案。我试图将DbContext与数据库生成的.edmx模型一起使用。 （不是代码优先）所以我需要将.edmx文件中的默认代码生成模板切换为Ado.NET DbContext Generator。我也不得不下载这个因为它不在我右键单击.edmx设计器表面并选择“添加代码生成项”的代码生成器列表中从这里下载：download EF 4.x DbContext Generator for C# 或者for 5.x - check out this link.
所以在我安装了.edmx文件的代码生成项之后，并在我的类中添加了一个构造函数，该构造函数派生自DbContext，它命名我的连接字符串
public class ContentRepository: DbContext
{
public DbSet<Content_Template> content_Templates { get; set; }
public DbSet<Master_Template> master_Templates { get; set; }
public DbSet<Master_Content_Map> master_Content_Maps { get; set; }
public ContentRepository()
: base("name=MessagingSystemEntities")
{
}
我的问题解决了。也许它会帮助你，我希望如此。
答案 1 :(得分：0)
解决了此错误，因为我在类级别设置了NotMapped属性，以便向数据库表而不是在属性级别添加额外的属性。
错误：
[NotMapped]
public partial class vw_MyUser
{
public string UniqueId
{
get
{
...
}
}
}
右：
public partial class vw_MyUser
{
[NotMapped]
public string UniqueId
{
get
{
...
}
}
}