我有以下的POCO类:实体框架 - 加载实体的标识没有被分配
public class Person : Entity
{
public string FirstName { get; set; }
public string MiddleName1 { get; set; }
public string MiddleName2 { get; set; }
public string LastName { get; set; }
public byte? DayOfBirth { get; set; }
public byte? MonthOfBirth { get; set; }
public Int16? YearOfBirth { get; set; }
public string MobileNumber { get; set; }
}
public abstract class Entity
{
public int Id { get; set; }
}
以下是相应的EDMX XML:
<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="EntityFramework.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="EntityFrameworkStoreContainer">
<EntitySet Name="People" EntityType="EntityFramework.Store.People" store:Type="Tables" Schema="dbo" />
</EntityContainer>
<EntityType Name="People">
<Key>
<PropertyRef Name="Id" />
</Key>
<Property Name="Id" Type="int" Nullable="false" />
<Property Name="FirstName" Type="nvarchar" Nullable="false" MaxLength="50" />
<Property Name="MiddleName1" Type="nvarchar" MaxLength="50" />
<Property Name="MiddleName2" Type="nvarchar" MaxLength="50" />
<Property Name="LastName" Type="nvarchar" Nullable="false" MaxLength="50" />
<Property Name="DayOfBirth" Type="tinyint" />
<Property Name="MonthOfBirth" Type="tinyint" />
<Property Name="YearOfBirth" Type="smallint" />
<Property Name="MobileNumber" Type="varchar" MaxLength="20" />
</EntityType>
</Schema>
</edmx:StorageModels>
<!-- CSDL content -->
<edmx:ConceptualModels>
<Schema Namespace="EntityFramework" Alias="Self" xmlns:annotation="http://schemas.microsoft.com/ado/2009/02/edm/annotation" xmlns="http://schemas.microsoft.com/ado/2008/09/edm">
<EntityContainer Name="TheCleavesEntities" annotation:LazyLoadingEnabled="true">
<EntitySet Name="People" EntityType="EntityFramework.Person" />
</EntityContainer>
<EntityType Name="Person">
<Key>
<PropertyRef Name="Id" />
</Key>
<Property Name="Id" Type="Int32" Nullable="false" />
<Property Name="FirstName" Type="String" Nullable="false" MaxLength="50" Unicode="true" FixedLength="false" />
<Property Name="MiddleName1" Type="String" MaxLength="50" Unicode="true" FixedLength="false" />
<Property Name="MiddleName2" Type="String" MaxLength="50" Unicode="true" FixedLength="false" />
<Property Name="LastName" Type="String" Nullable="false" MaxLength="50" Unicode="true" FixedLength="false" />
<Property Name="DayOfBirth" Type="Byte" Nullable="true" />
<Property Name="MonthOfBirth" Type="Byte" Nullable="true" />
<Property Name="YearOfBirth" Type="Int16" Nullable="true" />
<Property Name="MobileNumber" Type="String" MaxLength="20" Unicode="false" FixedLength="false" />
</EntityType>
</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="EntityFrameworkStoreContainer" CdmEntityContainer="TheCleavesEntities">
<EntitySetMapping Name="People"><EntityTypeMapping TypeName="EntityFramework.Person"><MappingFragment StoreEntitySet="People">
<ScalarProperty Name="Id" ColumnName="Id" />
<ScalarProperty Name="FirstName" ColumnName="FirstName" />
<ScalarProperty Name="MiddleName1" ColumnName="MiddleName1" />
<ScalarProperty Name="MiddleName2" ColumnName="MiddleName2" />
<ScalarProperty Name="LastName" ColumnName="LastName" />
<ScalarProperty Name="DayOfBirth" ColumnName="DayOfBirth" />
<ScalarProperty Name="MonthOfBirth" ColumnName="MonthOfBirth" />
<ScalarProperty Name="YearOfBirth" ColumnName="YearOfBirth" />
<ScalarProperty Name="MobileNumber" ColumnName="MobileNumber" />
</MappingFragment></EntityTypeMapping></EntitySetMapping>
</EntityContainerMapping>
</Mapping>
</edmx:Mappings>
</edmx:Runtime>
<!-- EF Designer content (DO NOT EDIT MANUALLY BELOW HERE) -->
<Designer xmlns="http://schemas.microsoft.com/ado/2008/10/edmx">
<Connection>
<DesignerInfoPropertySet>
<DesignerProperty Name="MetadataArtifactProcessing" Value="EmbedInOutputAssembly" />
</DesignerInfoPropertySet>
</Connection>
<Options>
<DesignerInfoPropertySet>
<DesignerProperty Name="ValidateOnBuild" Value="true" />
<DesignerProperty Name="EnablePluralization" Value="True" />
<DesignerProperty Name="IncludeForeignKeysInModel" Value="False" />
</DesignerInfoPropertySet>
</Options>
<!-- Diagram content (shape and connector positions) -->
<Diagrams>
<Diagram Name="TheCleaves">
<EntityTypeShape EntityType="EntityFramework.Person" Width="1.5" PointX="0.75" PointY="0.75" Height="2.7494921874999996" IsExpanded="true" />
</Diagram>
</Diagrams>
</Designer>
</edmx:Edmx>
当我加载一个实体(也仅是目前数据库中有一行)用代码:
IEnumerable<Person> people = context.People.Where(x => true);
我发现返回的Id属性Person对象为0(在数据库中为1)。任何人都有任何想法,为什么它似乎没有设置?
感谢
是否存在与您的实体类相对应的映射?你是否期望所有的Ids都是全球独一无二或独一无二的类型?即如果您有人员和产品,是否可以有Id为1的产品和Id为1的人员?你想使用继承来共享行为,或者一个接口是否可以完成这项工作? (实体框架使用继承进行事务处理,它不会与接口一起使用) – RichardW1001 2011-05-17 08:15:40
只适用于该类型。我使用继承来共享行为(它在语义上也是合理的 - 实体是特定类的类)。你认为这个Id没有被填充,因为它来自基类吗? – David 2011-05-17 18:22:41