4

我一直在尝试修复此错误一段时间。

每当我的应用程序尝试创建我的数据上下文的实例时，我都会收到此错误。

下面是代码：

    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

这是完整的错误文本：

未映射“RandomRentals.Rental”类型。使用 Ignore 方法或 NotMappedAttribute 数据注释检查该类型是否被显式排除。验证该类型是否被定义为一个类，不是原始的、嵌套的或泛型的，并且不是从 EntityObject 继承的。

编辑：租赁类的代码。

[EdmEntityTypeAttribute(NamespaceName="DevelopmentModel", Name="Rental")]
[Serializable()]
[DataContractAttribute(IsReference=true)]

公共部分类出租：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

}

任何帮助将不胜感激

4

2 回答 2

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 有关于实体框架的培训视频。我找到了我的问题的答案。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）因此我需要将 .edmx 文件中的默认代码生成模板切换为 Ado.NET DbContext Generator。我还必须下载它，因为当我右键单击 .edmx 设计器表面并选择“添加代码生成项”时，它不在我看到的代码生成器列表中 从这里下载： 下载 EF 4.x DbContext Generator for C# 或这里5.x - 查看此链接。

因此，在我将其安装为 .edmx 文件的代码生成项之后，并向我的类添加了一个从 DbContext 派生的构造函数，该构造函数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。也许它也会对你有所帮助，我希望如此。

于 2012-11-17T21:26:05.987 回答
0

出现此错误是因为我在类级别设置了 NotMapped 属性，以便向我的数据库表添加一个额外的属性，而不是在属性级别。

错误的：

[NotMapped]
    public partial class vw_MyUser
    {
        public string UniqueId
        {
            get
            {
                ...           
            }
        }
    }

对： 

        public partial class vw_MyUser
        {
            [NotMapped]
            public string UniqueId
            {
                get
                {
                    ...           
                }
            }
        }
于 2020-03-21T22:33:07.780 回答