EF4 POCO（不使用T4）：映射和元数​​据信息无法找到的EntityType [英] EF4 POCO (not using T4): Mapping and metadata information could not be found for EntityType

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问题描述

我有一个pretty的与实体模型（包含两个简单的实体），两个手工波苏斯和一个手工制作的Context类简单的控制台项目。该方案将触发对数据库的简单查询和一切，包括LazyLoading工作正常。

的问题：的，只要我再添实体数据模型（即使我添加空单），在Ef2PlaygroundModel_3Container来电来CreateObjectSet抛出以下异常：

 未处理的异常：System.InvalidOperationException：映射和元数​​据信息无法发现的EntityTypeEF2_Playground.Driver。
  在System.Data.Objects.ObjectContext.GetTypeUsage（类型entityCLRType）
  在System.Data.Objects.ObjectContext.GetEntitySetFromContainer（集装箱EntityContainer相关，类型entityCLRType，字符串exceptionParameterName）
  在System.Data.Objects.ObjectContext.GetEntitySetForType（类型entityCLRType，字符串exceptionParameterName）
  在System.Data.Objects.ObjectContext.CreateObjectSet [TEntity]（）
  在EF2_Playground.Ef2PlaygroundModel_3Container.get_Drivers（）在C：\ ... \ Ef2PlaygroundModel_3Pocos.cs：行64
  在EF2_Playground.Program.Main（字串[] args）在C：\ ... \的Program.cs：行15

有没有人有什么错误在这里的想法？

这是工作项目：

Ef2PlaygroundModel_3.edmx：

EF4数据模型

code生成策略设置为无

 ＆LT; XML版本=1.0编码=UTF-8＆GT？;
＆LT; EDMX：EDMX版本=2.0的xmlns：EDMX =htt​​p://schemas.microsoft.com/ado/2008/10/edmx＆GT;
  ＆LT;！ -  EF运行时的内容 - ＆GT;
  ＆LT; EDMX：运行＆GT;
    ＆LT;！ -  SSDL内容 - ＆GT;
    ＆LT; EDMX：StorageModels＆GT;
      ＆LT;模式命名空间=Ef2PlaygroundModel_3.Store别名=自我提供程序=System.Data.SqlClient的ProviderManifestToken =2008的xmlns：商店=htt​​p://schemas.microsoft.com/ado/2007/12/ EDM / EntityStoreSchemaGenerator的xmlns =http://schemas.microsoft.com/ado/2009/02/edm/ssdl＆GT;
        ＆LT; EntityContainer相关名称=Ef2PlaygroundModel_3StoreContainer＆GT;
          ＆LT; EntitySet的名称=汽车总动员的EntityType =Ef2PlaygroundModel_3.Store.Cars店：TYPE =表模式=DBO/＆GT;
          ＆LT; EntitySet的名称=驱动程序的EntityType =Ef2PlaygroundModel_3.Store.Drivers店：TYPE =表模式=DBO/＆GT;
          ＆LT; EntitySet的名称=CarDriver的EntityType =Ef2PlaygroundModel_3.Store.CarDriver店：TYPE =表模式=DBO/＆GT;
          ＆LT; AssociationSet名称=FK_CarDriver_Car协会=Ef2PlaygroundModel_3.Store.FK_CarDriver_Car＆GT;
            ＆LT;作用到底=车的EntitySet =汽车/＆GT;
            ＆LT;作用到底=CarDriver的EntitySet =CarDriver/＆GT;
          ＆LT; / AssociationSet＆GT;
          ＆LT; AssociationSet名称=FK_CarDriver_Driver协会=Ef2PlaygroundModel_3.Store.FK_CarDriver_Driver＆GT;
            ＆LT;作用到底=驱动程序的EntitySet =驱动程序/＆GT;
            ＆LT;作用到底=CarDriver的EntitySet =CarDriver/＆GT;
          ＆LT; / AssociationSet＆GT;
        ＆LT; /＆EntityContainer相关GT;
        ＆LT;的EntityType名称=汽车总动员＆GT;
          ＆LT;钥匙＆GT;
            ＆LT; PropertyRef名称=ID/＆GT;
          ＆LT; /钥匙＆GT;
          ＆LT;属性名=ID类型=INTStoreGeneratedPattern =身份可空=FALSE/＆GT;
          ＆LT;属性名=品牌TYPE =为nvarchar（max）可空=FALSE/＆GT;
          ＆LT;属性名=型号TYPE =为nvarchar（max）可空=FALSE/＆GT;
          ＆LT;属性名=RELEASEDATETYPE =日期时间可空=真/＆GT;
        ＆LT; /的EntityType＆GT;
        ＆LT;的EntityType名称=驱动程序＆GT;
          ＆LT;钥匙＆GT;
            ＆LT; PropertyRef名称=ID/＆GT;
          ＆LT; /钥匙＆GT;
          ＆LT;属性名=ID类型=INTStoreGeneratedPattern =身份可空=FALSE/＆GT;
          ＆LT;属性名=姓名类型=为nvarchar（max）可空=FALSE/＆GT;
        ＆LT; /的EntityType＆GT;
        ＆LT;的EntityType名称=CarDriver＆GT;
          ＆LT;钥匙＆GT;
            ＆LT; PropertyRef名称=Cars_Id/＆GT;
            ＆LT; PropertyRef名称=Drivers_Id/＆GT;
          ＆LT; /钥匙＆GT;
          ＆LT;属性名=Cars_IdTYPE =INT可空=FALSE/＆GT;
          ＆LT;属性名=Drivers_IdTYPE =INT可空=FALSE/＆GT;
        ＆LT; /的EntityType＆GT;
        ＆LT;协会名称=FK_CarDriver_Car＆GT;
          ＆LT;作用到底=车类型=Ef2PlaygroundModel_3.Store.Cars多重=1/＆GT;
          ＆LT;作用到底=CarDriverTYPE =Ef2PlaygroundModel_3.Store.CarDriver多重=*/＆GT;
          ＆LT; ReferentialConstraint＆GT;
            ＆LT;主体作用=汽车与GT;
              ＆LT; PropertyRef名称=ID/＆GT;
            ＆LT; /首席＆GT;
            ＆LT;依赖的角色=CarDriver＆GT;
              ＆LT; PropertyRef名称=Cars_Id/＆GT;
            ＆LT; /从属＆GT;
          ＆LT; / ReferentialConstraint＆GT;
        ＆LT; /协会＆GT;
        ＆LT;协会名称=FK_CarDriver_Driver＆GT;
          ＆LT;作用到底=CarDriverTYPE =Ef2PlaygroundModel_3.Store.CarDriver多重=*/＆GT;
          ＆LT;作用到底=驱动程序类型=Ef2PlaygroundModel_3.Store.Drivers多重=1/＆GT;
          ＆LT; ReferentialConstraint＆GT;
            ＆LT;主体作用=驱动程序＆GT;
              ＆LT; PropertyRef名称=ID/＆GT;
            ＆LT; /首席＆GT;
            ＆LT;依赖的角色=CarDriver＆GT;
              ＆LT; PropertyRef名称=Drivers_Id/＆GT;
            ＆LT; /从属＆GT;
          ＆LT; / ReferentialConstraint＆GT;
        ＆LT; /协会＆GT;
      ＆LT; /架构＆GT;
    ＆LT; / EDMX：StorageModels＆GT;
    ＆LT;！ -  CSDL内容 - ＆GT;
    ＆LT; EDMX：ConceptualModels＆GT;
      ＆LT;模式的xmlns =htt​​p://schemas.microsoft.com/ado/2008/09/edm的xmlns：CG =htt​​p://schemas.microsoft.com/ado/2006/04/$c$cgeneration的xmlns：店内=htt​​p://schemas.microsoft.com/ado/2007/12/edm/EntityStoreSchemaGenerator命名空间=Ef2PlaygroundModel_3别名=自我的xmlns：诠释=htt​​p://schemas.microsoft.com/ ADO / 2009/02 / EDM /注释＆GT;
        ＆LT; EntityContainer相关名称=Ef2PlaygroundModel_3Container注释：LazyLoadingEnabled =真正的＆GT;
          ＆LT; EntitySet的名称=汽车总动员的EntityType =Ef2PlaygroundModel_3.Car/＆GT;
          ＆LT; EntitySet的名称=驱动程序的EntityType =Ef2PlaygroundModel_3.Driver/＆GT;
          ＆LT; AssociationSet名称=CarDriver协会=Ef2PlaygroundModel_3.CarDriver＆GT;
            ＆LT;作用到底=车的EntitySet =汽车/＆GT;
            ＆LT;作用到底=驱动程序的EntitySet =驱动程序/＆GT;
          ＆LT; / AssociationSet＆GT;
        ＆LT; /＆EntityContainer相关GT;
        ＆LT;的EntityType名称=汽车与GT;
          ＆LT;钥匙＆GT;
            ＆LT; PropertyRef名称=ID/＆GT;
          ＆LT; /钥匙＆GT;
          ＆LT;物业类型=的Int32NAME =ID可空=假的注释：StoreGeneratedPattern =身份/＆GT;
          ＆LT;物业类型=字符串NAME =牌可空=FALSE/＆GT;
          ＆LT;物业类型=字符串NAME =模型可空=FALSE/＆GT;
          ＆LT;物业类型=日期时间NAME =RELEASEDATE可空=真/＆GT;
          ＆LT; NavigationProperty名称=驱动程序的关系=Ef2PlaygroundModel_3.CarDriverFromRole =汽车ToRole =驱动程序/＆GT;
        ＆LT; /的EntityType＆GT;
        ＆LT;的EntityType名称=驱动程序＆GT;
          ＆LT;钥匙＆GT;
            ＆LT; PropertyRef名称=ID/＆GT;
          ＆LT; /钥匙＆GT;
          ＆LT;物业类型=的Int32NAME =ID可空=假的注释：StoreGeneratedPattern =身份/＆GT;
          ＆LT;物业类型=字符串名称=名称可空=FALSE/＆GT;
          ＆LT; NavigationProperty名称=汽车总动员的关系=Ef2PlaygroundModel_3.CarDriverFromRole =驱动程序ToRole =汽车/＆GT;
        ＆LT; /的EntityType＆GT;
        ＆LT;协会名称=CarDriver＆GT;
          ＆LT;结束类型=Ef2PlaygroundModel_3.Car角色=汽车多重=*/＆GT;
          ＆LT;结束类型=Ef2PlaygroundModel_3.Driver角色=驱动程序多重=*/＆GT;
        ＆LT; /协会＆GT;
      ＆LT; /架构＆GT;
    ＆LT; / EDMX：ConceptualModels＆GT;
    ＆LT;  - ！C-S映射的内容 - ＆GT;
    ＆LT; EDMX：映射＆GT;
      ＆LT;映射空间=CS的xmlns =htt​​p://schemas.microsoft.com/ado/2008/09/mapping/cs＆GT;
        ＆LT; EntityContainerMapping StorageEntityContainer =Ef2PlaygroundModel_3StoreContainerCdmEntityContainer =Ef2PlaygroundModel_3Container＆GT;
          ＆LT; EntitySetMapping名称=汽车总动员＆GT;
            ＆LT; EntityTypeMapping类型名=IsTypeOf（Ef2PlaygroundModel_3.Car）＆GT;
              ＆LT; MappingFragment StoreEntitySet =汽车总动员＆GT;
                ＆LT; ScalarProperty名称=ID的ColumnName =ID/＆GT;
                ＆LT; ScalarProperty名称=品牌的ColumnName =品牌/＆GT;
                ＆LT; ScalarProperty名称=模型的ColumnName =模式/＆GT;
                ＆LT; ScalarProperty名称=RELEASEDATE的ColumnName =RELEASEDATE/＆GT;
              ＆LT; / MappingFragment＆GT;
            ＆LT; / EntityTypeMapping＆GT;
          ＆LT; / EntitySetMapping＆GT;
          ＆LT; EntitySetMapping名称=驱动程序＆GT;
            ＆LT; EntityTypeMapping类型名=IsTypeOf（Ef2PlaygroundModel_3.Driver）＆GT;
              ＆LT; MappingFragment StoreEntitySet =驱动程序＆GT;
                ＆LT; ScalarProperty名称=ID的ColumnName =ID/＆GT;
                ＆LT; ScalarProperty名称=名称的ColumnName =名称/＆GT;
              ＆LT; / MappingFragment＆GT;
            ＆LT; / EntityTypeMapping＆GT;
          ＆LT; / EntitySetMapping＆GT;
          ＆LT; AssociationSetMapping名称=CarDriver类型名=Ef2PlaygroundModel_3.CarDriverStoreEntitySet =CarDriver＆GT;
            ＆LT; EndProperty名称=汽车与GT;
              ＆LT; ScalarProperty名称=ID的ColumnName =Cars_Id/＆GT;
            ＆LT; / EndProperty＆GT;
            ＆LT; EndProperty名称=驱动程序＆GT;
              ＆LT; ScalarProperty名称=ID的ColumnName =Drivers_Id/＆GT;
            ＆LT; / EndProperty＆GT;
          ＆LT; / AssociationSetMapping＆GT;
        ＆LT; / EntityContainerMapping＆GT;
      ＆LT; /映射＆GT;
    ＆LT; / EDMX：映射＆GT;
  ＆LT; / EDMX：运行＆GT;
  ＆LT;！ -  EF设计内容（不要手动编辑低于HERE） - ＆GT;
  ＆LT; EDMX：设计师的xmlns =htt​​p://schemas.microsoft.com/ado/2008/10/edmx＆GT;
    ＆LT; EDMX：连接＆GT;
      ＆LT; D​​esignerInfoPropertySet＆GT;
        ＆LT; D​​esignerProperty名称=MetadataArtifactProcessingVALUE =EmbedInOutputAssembly/＆GT;
      ＆LT; / DesignerInfoPropertySet＆GT;
    ＆LT; / EDMX：连接＆GT;
    ＆LT; EDMX：选项＆gt;
      ＆LT; D​​esignerInfoPropertySet＆GT;
        ＆LT; D​​esignerProperty名称=ValidateOnBuildVALUE =真/＆GT;
        ＆LT; D​​esignerProperty名称=EnablePluralizationVALUE =FALSE/＆GT;
        ＆LT; D​​esignerProperty NAME =codeGenerationStrategyVALUE =无/＆GT;
      ＆LT; / DesignerInfoPropertySet＆GT;
    ＆LT; / EDMX：选项＆gt;
    ＆LT;！ - 图的内容（形状和连接器的位置） - ＆GT;
    ＆LT; EDMX：图＆GT;
      ＆LT;图名称=Ef2PlaygroundModel_3＆GT;
        ＆LT; EntityTypeShape的EntityType =Ef2PlaygroundModel_3.CarWIDTH =1.5PointX =3.25尖尖=1.625高度=1.787985026041667/＆GT;
        ＆LT; EntityTypeShape的EntityType =Ef2PlaygroundModel_3.DriverWIDTH =1.5PointX =5.375尖尖=1.625高度=1.59568359375/＆GT;
        ＆LT; AssociationConnector协会=Ef2PlaygroundModel_3.CarDriver＆GT;
          ＆LT; ConnectorPoint PointX =4.75尖尖=2.422841796875/＆GT;
          ＆LT; ConnectorPoint PointX =5.375尖尖=2.422841796875/＆GT;
        ＆LT; / AssociationConnector＆GT;
      ＆LT; /图＆GT;
    ＆LT; / EDMX：图＆GT;
  ＆LT; / EDMX：设计师＆GT;
＆LT; / EDMX：EDMX＆GT;

的app.config： 

 ＆lt;结构＆GT;
  ＆LT;的ConnectionStrings＆GT;
    ＆LT;添加
      NAME =Ef2PlaygroundModel_3Container
      connectionString="metadata=res://*/Ef2PlaygroundModel_3.csdl|res://*/Ef2PlaygroundModel_3.ssdl|res://*/Ef2PlaygroundModel_3.msl;provider=System.Data.SqlClient;provider连接字符串=安培; QUOT;数据源= \ SqlEx preSS;初始目录= Ef2PlaygroundModel_3;集成安全性= TRUE; MultipleActiveResultSets =真放; QUOT;
      的providerName =System.Data.EntityClient
    /＆GT;
  ＆LT; /的ConnectionStrings＆GT;
＆LT; /结构＆gt;

Ef2PlaygroundModel_3Pocos.cs： 

 使用系统;
使用System.Collections.Generic;
使用System.Data.Objects;

命名空间EF2_Playground
{
  公共类车
  {
    公共车（）
    {
      驱动程序=新的名单，其中，驱动程序和GT;（）;
    }

    公众诠释编号{获得;组; }
    公共字符串品牌{获得;组; }
    公共字符串型号{获得;组; }
    公开日期时间？ RELEASEDATE {获得;组; }

    公共虚拟目录＆LT;驱动＆GT;司机{获得;私定; }
  }

  公共类驱动程序
  {
    公共驱动器（）
    {
      汽车=新的名单，其中，汽车及GT;（）;
    }

    公众诠释编号{获得;组; }
    公共字符串名称{;组; }

    公共虚拟目录＆LT;车＆GT;汽车{获得;私定; }
  }

  公共类Ef2PlaygroundModel_3Container：ObjectContext的
  {
    公共Ef2PlaygroundModel_3Container（）
      ：基地（NAME = Ef2PlaygroundModel_3Container）
    {
      ContextOptions.LazyLoadingEnabled = TRUE;
    }

    公共IObjectSet＆LT;车＆GT;汽车
    {
      {返回CreateObjectSet＆LT;车＆GT;（）; }
    }

    公共IObjectSet＆LT;驱动＆GT;司机
    {
      {返回CreateObjectSet＆LT;驱动＆GT;（）; }
    }
  }
}

Program.cs的： 

 使用系统;

命名空间EF2_Playground
{
  类节目
  {
    静态无效的主要（字串[] args）
    {
      使用（VAR CTX =新Ef2PlaygroundModel_3Container（））
      {
        的foreach（在ctx.Drivers VAR驱动程序）
        {
          Console.WriteLine（driver.Name）;
          的foreach（VAR车driver.Cars）
          {
            Console.WriteLine（驱动{0}  -  {1}（发布{2}），car.Brand，car.Model，car.ReleaseDate）;
          }
        }
      }
    }
  }
}

最后Model1.edmx，一旦我把它添加到项目中打破了整个事情： 

 ＆LT; XML版本=1.0编码=UTF-8＆GT？;
＆LT; EDMX：EDMX版本=2.0的xmlns：EDMX =htt​​p://schemas.microsoft.com/ado/2008/10/edmx＆GT;
  ＆LT;！ -  EF运行时的内容 - ＆GT;
  ＆LT; EDMX：运行＆GT;
    ＆LT;！ -  SSDL内容 - ＆GT;
    ＆LT; EDMX：StorageModels＆GT;
      ＆LT;模式的xmlns =htt​​p://schemas.microsoft.com/ado/2009/02/edm/ssdl命名空间=Model1.Store别名=自我提供程序=System.Data.SqlClient的ProviderManifestToken = 2005年＆GT;
        ＆LT; EntityContainer相关名称=Model1TargetContainer＆GT;
        ＆LT; /＆EntityContainer相关GT;
      ＆LT; /架构＆GT;
    ＆LT; / EDMX：StorageModels＆GT;
    ＆LT;！ -  CSDL内容 - ＆GT;
    ＆LT; EDMX：ConceptualModels＆GT;
      ＆LT;模式的xmlns =htt​​p://schemas.microsoft.com/ado/2008/09/edm的xmlns：CG =htt​​p://schemas.microsoft.com/ado/2006/04/$c$cgeneration的xmlns：店内=htt​​p://schemas.microsoft.com/ado/2007/12/edm/EntityStoreSchemaGenerator命名空间=型号1别名=自我的xmlns：诠释=htt​​p://schemas.microsoft.com/ ADO / 2009/02 / EDM /注释＆GT;
        ＆LT; EntityContainer相关名称=Model1Container注释：LazyLoadingEnabled =真正的＆GT;
        ＆LT; /＆EntityContainer相关GT;
      ＆LT; /架构＆GT;
    ＆LT; / EDMX：ConceptualModels＆GT;
    ＆LT;  - ！C-S映射的内容 - ＆GT;
    ＆LT; EDMX：映射＆GT;
      ＆LT;映射的xmlns =htt​​p://schemas.microsoft.com/ado/2008/09/mapping/cs空间=CS＆GT;
        ＆LT;别名重点=模型VALUE =型号1/＆GT;
        ＆LT;别名重点=目标值=Model1.Store/＆GT;
        ＆LT; EntityContainerMapping CdmEntityContainer =Model1ContainerStorageEntityContainer =Model1TargetContainer＆GT;
        ＆LT; / EntityContainerMapping＆GT;
      ＆LT; /映射＆GT;
    ＆LT; / EDMX：映射＆GT;
  ＆LT; / EDMX：运行＆GT;
  ＆LT;！ -  EF设计内容（不要手动编辑低于HERE） - ＆GT;
  ＆LT; EDMX：设计师的xmlns =htt​​p://schemas.microsoft.com/ado/2008/10/edmx＆GT;
    ＆LT; EDMX：连接＆GT;
      ＆LT; D​​esignerInfoPropertySet＆GT;
        ＆LT; D​​esignerProperty名称=MetadataArtifactProcessingVALUE =EmbedInOutputAssembly/＆GT;
      ＆LT; / DesignerInfoPropertySet＆GT;
    ＆LT; / EDMX：连接＆GT;
    ＆LT; EDMX：选项＆gt;
      ＆LT; D​​esignerInfoPropertySet＆GT;
        ＆LT; D​​esignerProperty名称=ValidateOnBuildVALUE =真/＆GT;
        ＆LT; D​​esignerProperty名称=EnablePluralizationVALUE =FALSE/＆GT;
      ＆LT; / DesignerInfoPropertySet＆GT;
    ＆LT; / EDMX：选项＆gt;
    ＆LT;！ - 图的内容（形状和连接器的位置） - ＆GT;
    ＆LT; EDMX：图＆GT;
      ＆LT;图名称=型号1/＆GT;
    ＆LT; / EDMX：图＆GT;
  ＆LT; / EDMX：设计师＆GT;
＆LT; / EDMX：EDMX＆GT;

解决方案

好吧，我想我已经得到它。我减少了第二个模型（一个制动器项目）于以下内容：

的Class1.cs 

 使用System.Data.Objects.DataClasses;
[总成：EdmSchemaAttribute（）]

砰！出现众所周知的例外。

由于在许多情况下，阅读文档帮助：

  不支持

映射POCO实体，如果任何映射属性应用到自定义数据类，包括EdmSchemaAttribute在装配水平。

当然，我不要随便添加映射属性自定义数据类，但这并不重要的EdmSchemaAttribute因为，一个住在装配水平。

添加第二个非POCO模式导致code一代导致包含（至少）EdmSchemaAttribute和不支持的类。

我学到的东西：不要混合使用POCO和非POCO模型在一个组装的

。

I have a pretty simple console project with an entity model (containing two simple entities), two handmade POCOs and a handmade Context class. The program fires a simple query against the DB and everything including LazyLoading works fine.

The problem: As soon as i add another Entity data model (even if i add an empty one), the calls to CreateObjectSet in Ef2PlaygroundModel_3Container throw the following exception:

Unhandled Exception: System.InvalidOperationException: Mapping and metadata information could not be found for EntityType 'EF2_Playground.Driver'.
  at System.Data.Objects.ObjectContext.GetTypeUsage(Type entityCLRType)
  at System.Data.Objects.ObjectContext.GetEntitySetFromContainer(EntityContainer container, Type entityCLRType, String exceptionParameterName)
  at System.Data.Objects.ObjectContext.GetEntitySetForType(Type entityCLRType, String exceptionParameterName)
  at System.Data.Objects.ObjectContext.CreateObjectSet[TEntity]()
  at EF2_Playground.Ef2PlaygroundModel_3Container.get_Drivers() in C:\...\Ef2PlaygroundModel_3Pocos.cs:line 64
  at EF2_Playground.Program.Main(String[] args) in C:\...\Program.cs:line 15

Does anyone have an idea about what is going wrong here?

That is the working project:

Ef2PlaygroundModel_3.edmx:

Code Generation Strategy is set to "None"

<?xml version="1.0" encoding="utf-8"?>
<edmx:Edmx Version="2.0" xmlns:edmx="http://schemas.microsoft.com/ado/2008/10/edmx">
  <!-- EF Runtime content -->
  <edmx:Runtime>
    <!-- SSDL content -->
    <edmx:StorageModels>
      <Schema Namespace="Ef2PlaygroundModel_3.Store" Alias="Self" Provider="System.Data.SqlClient" ProviderManifestToken="2008" xmlns:store="http://schemas.microsoft.com/ado/2007/12/edm/EntityStoreSchemaGenerator" xmlns="http://schemas.microsoft.com/ado/2009/02/edm/ssdl">
        <EntityContainer Name="Ef2PlaygroundModel_3StoreContainer">
          <EntitySet Name="Cars" EntityType="Ef2PlaygroundModel_3.Store.Cars" store:Type="Tables" Schema="dbo"/>
          <EntitySet Name="Drivers" EntityType="Ef2PlaygroundModel_3.Store.Drivers" store:Type="Tables" Schema="dbo"/>
          <EntitySet Name="CarDriver" EntityType="Ef2PlaygroundModel_3.Store.CarDriver" store:Type="Tables" Schema="dbo"/>
          <AssociationSet Name="FK_CarDriver_Car" Association="Ef2PlaygroundModel_3.Store.FK_CarDriver_Car">
            <End Role="Car" EntitySet="Cars"/>
            <End Role="CarDriver" EntitySet="CarDriver"/>
          </AssociationSet>
          <AssociationSet Name="FK_CarDriver_Driver" Association="Ef2PlaygroundModel_3.Store.FK_CarDriver_Driver">
            <End Role="Driver" EntitySet="Drivers"/>
            <End Role="CarDriver" EntitySet="CarDriver"/>
          </AssociationSet>
        </EntityContainer>
        <EntityType Name="Cars">
          <Key>
            <PropertyRef Name="Id"/>
          </Key>
          <Property Name="Id" Type="int" StoreGeneratedPattern="Identity" Nullable="false"/>
          <Property Name="Brand" Type="nvarchar(max)" Nullable="false"/>
          <Property Name="Model" Type="nvarchar(max)" Nullable="false"/>
          <Property Name="ReleaseDate" Type="datetime" Nullable="true"/>
        </EntityType>
        <EntityType Name="Drivers">
          <Key>
            <PropertyRef Name="Id"/>
          </Key>
          <Property Name="Id" Type="int" StoreGeneratedPattern="Identity" Nullable="false"/>
          <Property Name="Name" Type="nvarchar(max)" Nullable="false"/>
        </EntityType>
        <EntityType Name="CarDriver">
          <Key>
            <PropertyRef Name="Cars_Id"/>
            <PropertyRef Name="Drivers_Id"/>
          </Key>
          <Property Name="Cars_Id" Type="int" Nullable="false"/>
          <Property Name="Drivers_Id" Type="int" Nullable="false"/>
        </EntityType>
        <Association Name="FK_CarDriver_Car">
          <End Role="Car" Type="Ef2PlaygroundModel_3.Store.Cars" Multiplicity="1"/>
          <End Role="CarDriver" Type="Ef2PlaygroundModel_3.Store.CarDriver" Multiplicity="*"/>
          <ReferentialConstraint>
            <Principal Role="Car">
              <PropertyRef Name="Id"/>
            </Principal>
            <Dependent Role="CarDriver">
              <PropertyRef Name="Cars_Id"/>
            </Dependent>
          </ReferentialConstraint>
        </Association>
        <Association Name="FK_CarDriver_Driver">
          <End Role="CarDriver" Type="Ef2PlaygroundModel_3.Store.CarDriver" Multiplicity="*"/>
          <End Role="Driver" Type="Ef2PlaygroundModel_3.Store.Drivers" Multiplicity="1"/>
          <ReferentialConstraint>
            <Principal Role="Driver">
              <PropertyRef Name="Id"/>
            </Principal>
            <Dependent Role="CarDriver">
              <PropertyRef Name="Drivers_Id"/>
            </Dependent>
          </ReferentialConstraint>
        </Association>
      </Schema>
    </edmx:StorageModels>
    <!-- CSDL content -->
    <edmx:ConceptualModels>
      <Schema xmlns="http://schemas.microsoft.com/ado/2008/09/edm" xmlns:cg="http://schemas.microsoft.com/ado/2006/04/codegeneration" xmlns:store="http://schemas.microsoft.com/ado/2007/12/edm/EntityStoreSchemaGenerator" Namespace="Ef2PlaygroundModel_3" Alias="Self" xmlns:annotation="http://schemas.microsoft.com/ado/2009/02/edm/annotation">
        <EntityContainer Name="Ef2PlaygroundModel_3Container" annotation:LazyLoadingEnabled="true">
          <EntitySet Name="Cars" EntityType="Ef2PlaygroundModel_3.Car"/>
          <EntitySet Name="Drivers" EntityType="Ef2PlaygroundModel_3.Driver"/>
          <AssociationSet Name="CarDriver" Association="Ef2PlaygroundModel_3.CarDriver">
            <End Role="Car" EntitySet="Cars"/>
            <End Role="Driver" EntitySet="Drivers"/>
          </AssociationSet>
        </EntityContainer>
        <EntityType Name="Car">
          <Key>
            <PropertyRef Name="Id"/>
          </Key>
          <Property Type="Int32" Name="Id" Nullable="false" annotation:StoreGeneratedPattern="Identity"/>
          <Property Type="String" Name="Brand" Nullable="false"/>
          <Property Type="String" Name="Model" Nullable="false"/>
          <Property Type="DateTime" Name="ReleaseDate" Nullable="true"/>
          <NavigationProperty Name="Drivers" Relationship="Ef2PlaygroundModel_3.CarDriver" FromRole="Car" ToRole="Driver"/>
        </EntityType>
        <EntityType Name="Driver">
          <Key>
            <PropertyRef Name="Id"/>
          </Key>
          <Property Type="Int32" Name="Id" Nullable="false" annotation:StoreGeneratedPattern="Identity"/>
          <Property Type="String" Name="Name" Nullable="false"/>
          <NavigationProperty Name="Cars" Relationship="Ef2PlaygroundModel_3.CarDriver" FromRole="Driver" ToRole="Car"/>
        </EntityType>
        <Association Name="CarDriver">
          <End Type="Ef2PlaygroundModel_3.Car" Role="Car" Multiplicity="*"/>
          <End Type="Ef2PlaygroundModel_3.Driver" Role="Driver" Multiplicity="*"/>
        </Association>
      </Schema>
    </edmx:ConceptualModels>
    <!-- C-S mapping content -->
    <edmx:Mappings>
      <Mapping Space="C-S" xmlns="http://schemas.microsoft.com/ado/2008/09/mapping/cs">
        <EntityContainerMapping StorageEntityContainer="Ef2PlaygroundModel_3StoreContainer" CdmEntityContainer="Ef2PlaygroundModel_3Container">
          <EntitySetMapping Name="Cars">
            <EntityTypeMapping TypeName="IsTypeOf(Ef2PlaygroundModel_3.Car)">
              <MappingFragment StoreEntitySet="Cars">
                <ScalarProperty Name="Id" ColumnName="Id"/>
                <ScalarProperty Name="Brand" ColumnName="Brand"/>
                <ScalarProperty Name="Model" ColumnName="Model"/>
                <ScalarProperty Name="ReleaseDate" ColumnName="ReleaseDate"/>
              </MappingFragment>
            </EntityTypeMapping>
          </EntitySetMapping>
          <EntitySetMapping Name="Drivers">
            <EntityTypeMapping TypeName="IsTypeOf(Ef2PlaygroundModel_3.Driver)">
              <MappingFragment StoreEntitySet="Drivers">
                <ScalarProperty Name="Id" ColumnName="Id"/>
                <ScalarProperty Name="Name" ColumnName="Name"/>
              </MappingFragment>
            </EntityTypeMapping>
          </EntitySetMapping>
          <AssociationSetMapping Name="CarDriver" TypeName="Ef2PlaygroundModel_3.CarDriver" StoreEntitySet="CarDriver">
            <EndProperty Name="Car">
              <ScalarProperty Name="Id" ColumnName="Cars_Id"/>
            </EndProperty>
            <EndProperty Name="Driver">
              <ScalarProperty Name="Id" ColumnName="Drivers_Id"/>
            </EndProperty>
          </AssociationSetMapping>
        </EntityContainerMapping>
      </Mapping>
    </edmx:Mappings>
  </edmx:Runtime>
  <!-- EF Designer content (DO NOT EDIT MANUALLY BELOW HERE) -->
  <edmx:Designer xmlns="http://schemas.microsoft.com/ado/2008/10/edmx">
    <edmx:Connection>
      <DesignerInfoPropertySet>
        <DesignerProperty Name="MetadataArtifactProcessing" Value="EmbedInOutputAssembly"/>
      </DesignerInfoPropertySet>
    </edmx:Connection>
    <edmx:Options>
      <DesignerInfoPropertySet>
        <DesignerProperty Name="ValidateOnBuild" Value="true"/>
        <DesignerProperty Name="EnablePluralization" Value="False"/>
        <DesignerProperty Name="CodeGenerationStrategy" Value="None"/>
      </DesignerInfoPropertySet>
    </edmx:Options>
    <!-- Diagram content (shape and connector positions) -->
    <edmx:Diagrams>
      <Diagram Name="Ef2PlaygroundModel_3">
        <EntityTypeShape EntityType="Ef2PlaygroundModel_3.Car" Width="1.5" PointX="3.25" PointY="1.625" Height="1.787985026041667"/>
        <EntityTypeShape EntityType="Ef2PlaygroundModel_3.Driver" Width="1.5" PointX="5.375" PointY="1.625" Height="1.59568359375"/>
        <AssociationConnector Association="Ef2PlaygroundModel_3.CarDriver">
          <ConnectorPoint PointX="4.75" PointY="2.422841796875"/>
          <ConnectorPoint PointX="5.375" PointY="2.422841796875"/>
        </AssociationConnector>
      </Diagram>
    </edmx:Diagrams>
  </edmx:Designer>
</edmx:Edmx>

app.config:

<configuration>
  <connectionStrings>
    <add 
      name="Ef2PlaygroundModel_3Container" 
      connectionString="metadata=res://*/Ef2PlaygroundModel_3.csdl|res://*/Ef2PlaygroundModel_3.ssdl|res://*/Ef2PlaygroundModel_3.msl;provider=System.Data.SqlClient;provider connection string=&quot;Data Source=.\SqlExpress;Initial Catalog=Ef2PlaygroundModel_3;Integrated Security=True;MultipleActiveResultSets=True&quot;" 
      providerName="System.Data.EntityClient" 
    />
  </connectionStrings>
</configuration>

Ef2PlaygroundModel_3Pocos.cs:

using System;
using System.Collections.Generic;
using System.Data.Objects;

namespace EF2_Playground
{
  public class Car
  {
    public Car()
    {
      Drivers = new List<Driver>();
    }

    public int Id { get; set; }
    public string Brand { get; set; }
    public string Model { get; set; }
    public DateTime? ReleaseDate { get; set; }

    public virtual List<Driver> Drivers { get; private set; }
  }

  public class Driver
  {
    public Driver()
    {
      Cars = new List<Car>();
    }

    public int Id { get; set; }
    public string Name { get; set; }

    public virtual List<Car> Cars { get; private set; }
  }

  public class Ef2PlaygroundModel_3Container : ObjectContext
  { 
    public Ef2PlaygroundModel_3Container()
      : base("name=Ef2PlaygroundModel_3Container") 
    {
      ContextOptions.LazyLoadingEnabled = true;
    }

    public IObjectSet<Car> Cars
    {
      get { return CreateObjectSet<Car>(); }
    }

    public IObjectSet<Driver> Drivers
    {
      get { return CreateObjectSet<Driver>(); }
    }
  }
}

Program.cs:

using System;

namespace EF2_Playground
{
  class Program
  {
    static void Main(string[] args)
    {
      using (var ctx = new Ef2PlaygroundModel_3Container())
      {
        foreach (var driver in ctx.Drivers)
        {
          Console.WriteLine(driver.Name);
          foreach (var car in driver.Cars)
          {
            Console.WriteLine("   drives a {0} - {1} (released on {2})", car.Brand, car.Model, car.ReleaseDate);
          }
        }
      }
    }
  }
}

And finally Model1.edmx that breaks the whole thing as soon as i add it to the project:

<?xml version="1.0" encoding="utf-8"?>
<edmx:Edmx Version="2.0" xmlns:edmx="http://schemas.microsoft.com/ado/2008/10/edmx">
  <!-- EF Runtime content -->
  <edmx:Runtime>
    <!-- SSDL content -->
    <edmx:StorageModels>
      <Schema xmlns="http://schemas.microsoft.com/ado/2009/02/edm/ssdl" Namespace="Model1.Store" Alias="Self" Provider="System.Data.SqlClient" ProviderManifestToken="2005">
        <EntityContainer Name="Model1TargetContainer">
        </EntityContainer>
      </Schema>
    </edmx:StorageModels>
    <!-- CSDL content -->
    <edmx:ConceptualModels>
      <Schema xmlns="http://schemas.microsoft.com/ado/2008/09/edm" xmlns:cg="http://schemas.microsoft.com/ado/2006/04/codegeneration" xmlns:store="http://schemas.microsoft.com/ado/2007/12/edm/EntityStoreSchemaGenerator" Namespace="Model1" Alias="Self" xmlns:annotation="http://schemas.microsoft.com/ado/2009/02/edm/annotation">
        <EntityContainer Name="Model1Container" annotation:LazyLoadingEnabled="true">
        </EntityContainer>
      </Schema>
    </edmx:ConceptualModels>
    <!-- C-S mapping content -->
    <edmx:Mappings>
      <Mapping xmlns="http://schemas.microsoft.com/ado/2008/09/mapping/cs" Space="C-S">
        <Alias Key="Model" Value="Model1"/>
        <Alias Key="Target" Value="Model1.Store"/>
        <EntityContainerMapping CdmEntityContainer="Model1Container" StorageEntityContainer="Model1TargetContainer">
        </EntityContainerMapping>
      </Mapping>
    </edmx:Mappings>
  </edmx:Runtime>
  <!-- EF Designer content (DO NOT EDIT MANUALLY BELOW HERE) -->
  <edmx:Designer xmlns="http://schemas.microsoft.com/ado/2008/10/edmx">
    <edmx:Connection>
      <DesignerInfoPropertySet>
        <DesignerProperty Name="MetadataArtifactProcessing" Value="EmbedInOutputAssembly"/>
      </DesignerInfoPropertySet>
    </edmx:Connection>
    <edmx:Options>
      <DesignerInfoPropertySet>
        <DesignerProperty Name="ValidateOnBuild" Value="true"/>
        <DesignerProperty Name="EnablePluralization" Value="False"/>
      </DesignerInfoPropertySet>
    </edmx:Options>
    <!-- Diagram content (shape and connector positions) -->
    <edmx:Diagrams>
      <Diagram Name="Model1"/>
    </edmx:Diagrams>
  </edmx:Designer>
</edmx:Edmx>

解决方案

Ok, i guess i've got it. I reduced the second model (the one that brakes the project) to the following:

Class1.cs

using System.Data.Objects.DataClasses;
[assembly: EdmSchemaAttribute()]

Bang! The well known exception appears.

As in so many cases, reading the documentation helps:

Mapping POCO entities is not supported if any mapping attributes are applied to custom data classes, including EdmSchemaAttribute at the assembly level.

Sure, i do not literally add mapping attributes to CUSTOM data classes but that doesn't matter for the EdmSchemaAttribute since that one lives on the assembly level.

Adding the second non-POCO model causes code generation resulting in a class that contains (at least) the EdmSchemaAttribute and that is not supported.

What i've learned: Don't mix POCO and non-POCO models in one assembly.

这篇关于EF4 POCO（不使用T4）：映射和元数​​据信息无法找到的EntityType的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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