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

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本文介绍了EF4 POCO（不使用T4）：无法为EntityType找到映射和元数据信息的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有一个非常简单的控制台项目，其中包含一个实体模型（包含两个简单实体），两个手工POCO和一个手工上下文类。该程序触发对DB的简单查询，包括LazyLoading在内的所有内容都可以正常工作。

问题：一旦添加了另一个Entity数据模型（即使我添加了一个空白的），在Ef2PlaygroundModel_3Container中调用CreateObjectSet抛出以下异常：

 未处理的异常：System.InvalidOperationException：无法为EntityType'EF2_Playground.Driver找到映射和元数据信息。 System.Data.Objects.ObjectContext.GetTypeUsage（Type entityCLRType）中的
 $ System.Data.Objects.ObjectContext.GetEntitySetFromContainer（EntityContainer容器，Type entityCLRType，String exceptionParameterName）中的
 System.Data中的
 .Objects.ObjectContext.GetEntitySetForType（Type entityCLRType，String 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（String [] args）在C：\ ... \Program.cs：行15 
  
 
 
 
 
  这是工作项目： 
 
 
   Ef2PlaygroundModel_3.edmx： p> 
 
 
  
 
 
 代码生成策略设置为无
 <？xml version =1.0encoding =utf-8？> 
< edmx：Edmx Version =2.0xmlns：edmx =http://schemas.microsoft.com/ado/2008/10/edmx> 
<！ -  EF运行时内容 - > 
< edmx：运行时> 
<！ -  SSDL内容 - > 
< edmx：StorageModels> 
< Schema Namespace =Ef2PlaygroundModel_3.StoreAlias =SelfProvider =System.Data.SqlClientProviderManifestToken =2008xmlns：store =http://schemas.microsoft.com/ado/ 2007/12 / edm / EntityStoreSchemaGeneratorxmlns =http://schemas.microsoft.com/ado/2009/02/edm/ssdl> 
< EntityContainer Name =Ef2PlaygroundModel_3StoreContainer> 
< EntitySet Name =CarsEntityType =Ef2PlaygroundModel_3.Store.Carsstore：Type =TablesSchema =dbo/> 
< EntitySet Name =DriversEntityType =Ef2PlaygroundModel_3.Store.Driversstore：Type =TablesSchema =dbo/> 
< EntitySet Name =CarDriverEntityType =Ef2PlaygroundModel_3.Store.CarDriverstore：Type =TablesSchema =dbo/> 
< AssociationSet Name =FK_CarDriver_CarAssociation =Ef2PlaygroundModel_3.Store.FK_CarDriver_Car> 
< End Role =CarEntitySet =Cars/> 
< End Role =CarDriverEntitySet =CarDriver/> 
< / AssociationSet> 
< AssociationSet Name =FK_CarDriver_DriverAssociation =Ef2PlaygroundModel_3.Store.FK_CarDriver_Driver> 
< End Role =DriverEntitySet =Drivers/> 
< End Role =CarDriverEntitySet =CarDriver/> 
< / AssociationSet> 
< / EntityContainer> 
< EntityType Name =Cars> 
< Key> 
< PropertyRef Name =Id/> 
< / Key> 
< Property Name =IdType =intStoreGeneratedPattern =IdentityNullable =false/> 
< Property Name =BrandType =nvarchar（max）Nullable =false/> 
< Property Name =ModelType =nvarchar（max）Nullable =false/> 
< Property Name =ReleaseDateType =datetimeNullable =true/> 
< / EntityType> 
< EntityType Name =Drivers> 
< Key> 
< PropertyRef Name =Id/> 
< / Key> 
< Property Name =IdType =intStoreGeneratedPattern =IdentityNullable =false/> 
< Property Name =NameType =nvarchar（max）Nullable =false/> 
< / EntityType> 
< EntityType Name =CarDriver> 
< Key> 
< PropertyRef Name =Cars_Id/> 
< PropertyRef Name =Drivers_Id/> 
< / Key> 
< Property Name =Cars_IdType =intNullable =false/> 
< Property Name =Drivers_IdType =intNullable =false/> 
< / EntityType> 
< Association Name =FK_CarDriver_Car> 
< End Role =CarType =Ef2PlaygroundModel_3.Store.CarsMultiplicity =1/> 
< End Role =CarDriverType =Ef2PlaygroundModel_3.Store.CarDriverMultiplicity =*/> 
<参考证明> 
< Principal Role =Car> 
< PropertyRef Name =Id/> 
< / Principal> 
<从属角色=CarDriver> 
< PropertyRef Name =Cars_Id/> 
< / Dependent> 
< / ReferentialConstraint> 
< / Association> 
<关联名称=FK_CarDriver_Driver> 
< End Role =CarDriverType =Ef2PlaygroundModel_3.Store.CarDriverMultiplicity =*/> 
< End Role =DriverType =Ef2PlaygroundModel_3.Store.DriversMultiplicity =1/> 
<参考证明> 
< Principal Role =Driver> 
< PropertyRef Name =Id/> 
< / Principal> 
<从属角色=CarDriver> 
< PropertyRef Name =Drivers_Id/> 
< / Dependent> 
< / ReferentialConstraint> 
< / Association> 
< / Schema> 
< / edmx：StorageModels> 
<！ -  CSDL内容 - > 
< edmx：ConceptualModels> 
< Schema xmlns =http://schemas.microsoft.com/ado/2008/09/edmxmlns：cg =http://schemas.microsoft.com/ado/2006/04/codegeneration xmlns：store =http://schemas.microsoft.com/ado/2007/12/edm/EntityStoreSchemaGeneratorNamespace =Ef2PlaygroundModel_3Alias =Selfxmlns：annotation =http://schemas.microsoft.com / ADO / 2009/02 / EDM /注释> 
< EntityContainer Name =Ef2PlaygroundModel_3Container注释：LazyLoadingEnabled =true> 
< EntitySet Name =CarsEntityType =Ef2PlaygroundModel_3.Car/> 
< EntitySet Name =DriversEntityType =Ef2PlaygroundModel_3.Driver/> 
< AssociationSet Name =CarDriverAssociation =Ef2PlaygroundModel_3.CarDriver> 
< End Role =CarEntitySet =Cars/> 
< End Role =DriverEntitySet =Drivers/> 
< / AssociationSet> 
< / EntityContainer> 
< EntityType Name =Car> 
< Key> 
< PropertyRef Name =Id/> 
< / Key> 
< Property Type =Int32Name =IdNullable =false注释：StoreGeneratedPattern =Identity/> 
< Property Type =StringName =BrandNullable =false/> 
< Property Type =StringName =ModelNullable =false/> 
< Property Type =DateTimeName =ReleaseDateNullable =true/> 
< NavigationProperty Name =DriversRelationship =Ef2PlaygroundModel_3.CarDriverFromRole =CarToRole =Driver/> 
< / EntityType> 
< EntityType Name =Driver> 
< Key> 
< PropertyRef Name =Id/> 
< / Key> 
< Property Type =Int32Name =IdNullable =false注释：StoreGeneratedPattern =Identity/> 
< Property Type =StringName =NameNullable =false/> 
< NavigationProperty Name =CarsRelationship =Ef2PlaygroundModel_3.CarDriverFromRole =DriverToRole =Car/> 
< / EntityType> 
<关联名称=CarDriver> 
< End Type =Ef2PlaygroundModel_3.CarRole =CarMultiplicity =*/> 
< End Type =Ef2PlaygroundModel_3.DriverRole =DriverMultiplicity =*/> 
< / Association> 
< / Schema> 
< / edmx：ConceptualModels> 
<！ -  C-S映射内容 - > 
< edmx：映射> 
< Mapping Space =C-Sxmlns =http://schemas.microsoft.com/ado/2008/09/mapping/cs> 
< EntityContainerMapping StorageEntityContainer =Ef2PlaygroundModel_3StoreContainerCdmEntityContainer =Ef2PlaygroundModel_3Container> 
< EntitySetMapping Name =Cars> 
< EntityTypeMapping TypeName =IsTypeOf（Ef2PlaygroundModel_3.Car）> 
< MappingFragment StoreEntitySet =Cars> 
< ScalarProperty Name =IdColumnName =Id/> 
< ScalarProperty Name =BrandColumnName =Brand/> 
< ScalarProperty Name =ModelColumnName =Model/> 
< ScalarProperty Name =ReleaseDateColumnName =ReleaseDate/> 
< / MappingFragment> 
< / EntityTypeMapping> 
< / EntitySetMapping> 
< EntitySetMapping Name =Drivers> 
< EntityTypeMapping TypeName =IsTypeOf（Ef2PlaygroundModel_3.Driver）> 
< MappingFragment StoreEntitySet =Drivers> 
< ScalarProperty Name =IdColumnName =Id/> 
< ScalarProperty Name =NameColumnName =Name/> 
< / MappingFragment> 
< / EntityTypeMapping> 
< / EntitySetMapping> 
< AssociationSetMapping Name =CarDriverTypeName =Ef2PlaygroundModel_3.CarDriverStoreEntitySet =CarDriver> 
< EndProperty Name =Car> 
< ScalarProperty Name =IdColumnName =Cars_Id/> 
< / EndProperty> 
< EndProperty Name =Driver> 
< ScalarProperty Name =IdColumnName =Drivers_Id/> 
< / EndProperty> 
< / AssociationSetMapping> 
< / EntityContainerMapping> 
< / Mapping> 
< / edmx：映射> 
< / edmx：Runtime> 
<！ -  EF设计师内容（请勿手动编辑此处） - > 
< edmx：Designer xmlns =http://schemas.microsoft.com/ado/2008/10/edmx> 
< edmx：Connection> 
< DesignerInfoPropertySet> 
< DesignerProperty Name =MetadataArtifactProcessingValue =EmbedInOutputAssembly/> 
< / DesignerInfoPropertySet> 
< / edmx：Connection> 
< edmx：选项> 
< DesignerInfoPropertySet> 
< DesignerProperty Name =ValidateOnBuildValue =true/> 
< DesignerProperty Name =EnablePluralizationValue =False/> 
< DesignerProperty Name =CodeGenerationStrategyValue =None/> 
< / DesignerInfoPropertySet> 
< / edmx：选项> 
<！ - 图表内容（形状和连接器位置） - > 
< edmx：Diagrams> 
< Diagram Name =Ef2PlaygroundModel_3> 
< EntityTypeShape EntityType =Ef2PlaygroundModel_3.CarWidth =1.5PointX =3.25PointY =1.625Height =1.787985026041667/> 
< EntityTypeShape EntityType =Ef2PlaygroundModel_3.DriverWidth =1.5PointX =5.375PointY =1.625Height =1.59568359375/> 
< AssociationConnector Association =Ef2PlaygroundModel_3.CarDriver> 
< ConnectorPoint PointX =4.75PointY =2.422841796875/> 
< ConnectorPoint PointX =5.375PointY =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： 
 使用系统; 
使用System.Collections.Generic; 
使用System.Data.Objects; 
 
命名空间EF2_Playground 
 {
 public class Car 
 {
 public Car（）
 {
 Drivers = new List& ;（）; 
} 
 
 public int Id {get;组; } 
 public string品牌{get;组; } 
 public string Model {get;组; } 
 public DateTime？ ReleaseDate {get;组; } 
 
 public virtual List< Driver>司机{get;私人集合
 
 
 public class Driver 
 {
 public Driver（）
 {
 Cars = new List< Car>（）; 
} 
 
 public int Id {get;组; } 
 public string Name {get;组; } 
 
 public virtual List< Car>汽车私人集合
 $ b 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>驱动
 {
 get {return CreateObjectSet< Driver>（）; } 
} 
} 
} 
  
  cs： 
  using System; 
 
命名空间EF2_Playground 
 {
类程序
 {
 static void Main（string [] args）
 {
 using var ctx = new Ef2PlaygroundModel_3Container（））
 {
 foreach（ctx.Drivers中的var驱动程序）
 {
 Console.WriteLine（driver.Name）; 
 foreach（驱动程序中的var car）
 {
 Console.WriteLine（驱动{0}  -  {1}（在{2}上发布），car.Brand，car 。型号，car.ReleaseDate）; 
} 
} 
} 
} 
} 
} 
  
 最后，一旦将我添加到项目中，Model1.edmx就会打破整个事情： 
 <？xml version =1.0encoding =utf-8？> 
< edmx：Edmx Version =2.0xmlns：edmx =http://schemas.microsoft.com/ado/2008/10/edmx> 
<！ -  EF运行时内容 - > 
< edmx：运行时> 
<！ -  SSDL内容 - > 
< edmx：StorageModels> 
< Schema xmlns =http://schemas.microsoft.com/ado/2009/02/edm/ssdlNamespace =Model1.StoreAlias =SelfProvider =System.Data.SqlClient ProviderManifestToken =2005> 
< EntityContainer Name =Model1TargetContainer> 
< / EntityContainer> 
< / Schema> 
< / edmx：StorageModels> 
<！ -  CSDL内容 - > 
< edmx：ConceptualModels> 
< Schema xmlns =http://schemas.microsoft.com/ado/2008/09/edmxmlns：cg =http://schemas.microsoft.com/ado/2006/04/codegeneration xmlns：store =http://schemas.microsoft.com/ado/2007/12/edm/EntityStoreSchemaGeneratorNamespace =Model1Alias =Selfxmlns：annotation =http://schemas.microsoft.com / ADO / 2009/02 / EDM /注释> 
< EntityContainer Name =Model1Container注释：LazyLoadingEnabled =true> 
< / EntityContainer> 
< / Schema> 
< / edmx：ConceptualModels> 
<！ -  C-S映射内容 - > 
< edmx：映射> 
<映射xmlns =http://schemas.microsoft.com/ado/2008/09/mapping/csSpace =C-S> 
< Alias Key =ModelValue =Model1/> 
< Alias Key =TargetValue =Model1.Store/> 
< EntityContainerMapping CdmEntityContainer =Model1ContainerStorageEntityContainer =Model1TargetContainer> 
< / EntityContainerMapping> 
< / Mapping> 
< / edmx：映射> 
< / edmx：Runtime> 
<！ -  EF设计师内容（请勿手动编辑此处） - > 
< edmx：Designer xmlns =http://schemas.microsoft.com/ado/2008/10/edmx> 
< edmx：Connection> 
< DesignerInfoPropertySet> 
< DesignerProperty Name =MetadataArtifactProcessingValue =EmbedInOutputAssembly/> 
< / DesignerInfoPropertySet> 
< / edmx：Connection> 
< edmx：选项> 
< DesignerInfoPropertySet> 
< DesignerProperty Name =ValidateOnBuildValue =true/> 
< DesignerProperty Name =EnablePluralizationValue =False/> 
< / DesignerInfoPropertySet> 
< / edmx：选项> 
<！ - 图表内容（形状和连接器位置） - > 
< edmx：Diagrams> 
< Diagram Name =Model1/> 
< / edmx：Diagrams> 
< / edmx：Designer> 
< / edmx：Edmx> 
  
 
 
解决方案
好吧，我想我已经有了。我将第二个模型（制造该项目的模型）减少到以下内容：
 
 
   Class1.cs  
 使用System.Data.Objects.DataClasses; 
 [assembly：EdmSchemaAttribute（）] 
  
 Bang！众所周知的异常出现。
 
 
 在许多情况下，阅读文档有助于：
 
 映射POCO实体不是支持，如果任何映射属性应用于自定义数据类，包括程序集级别的EdmSchemaAttribute。
 
 
当然，我不会字面上添加映射属性到CUSTOM数据类，但对于EdmSchemaAttribute无关紧要，因为它们位于程序集级别。
 
 
 添加第二个非POCO模型会导致代码生成一个包含（至少）EdmSchemaAttribute并且不支持的类。 
 
 
  我学到了什么：不要在一个程序集中混合POCO和非POCO模型。  / p> 
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.

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

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这是工作项目：

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

问题描述

这是工作项目：

That is the working project:

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

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