.net - 自動インクリメント列を持つエンティティ フレームワーク

Question

これについてはすでにいくつかの 質問 を読みましたが、解決策を試してみましたが（基本的に各質問と同じです）、成功しませんでした。

モデルを作成し、それを使用してローカル データベース (.sdf) ファイルを更新しました。今、エンティティを 1 つでも追加しようとしていますが、失敗します。つまり、エンティティを保存することすらできません。PKのidentityフィールドを設定し、StoredGeneratedPatternプロパティを構成し、手動で XML に直接設定することを確認しました (そこにあります)。私はまだ何も保存できません。私は何が欠けていますか？

エンティティ関係モデル

モデルの XML 構成 (TestDbEntities.edmx)

<?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="TestDbModel.Store" Alias="Self" Provider="System.Data.SqlServerCe.3.5" ProviderManifestToken="3.5" xmlns:store="http://schemas.microsoft.com/ado/2007/12/edm/EntityStoreSchemaGenerator" xmlns="http://schemas.microsoft.com/ado/2009/02/edm/ssdl">
  <EntityContainer Name="TestDbModelStoreContainer">
    <EntitySet Name="UserMessages" EntityType="TestDbModel.Store.UserMessages" store:Type="Tables" Schema="dbo" />
    <EntitySet Name="Users" EntityType="TestDbModel.Store.Users" store:Type="Tables" Schema="dbo" />
    <AssociationSet Name="Rel_User_Message" Association="TestDbModel.Store.Rel_User_Message">
      <End Role="users" EntitySet="Users" />
      <End Role="messages" EntitySet="UserMessages" />
    </AssociationSet>
  </EntityContainer>
  <EntityType Name="UserMessages">
    <Key>
      <PropertyRef Name="ID" />
    </Key>
    <Property Name="ID" Type="int" StoreGeneratedPattern="Identity" Nullable="false" />
    <Property Name="Message" Type="nvarchar" Nullable="true" MaxLength="1000" />
    <Property Name="Author_ID" Type="int" Nullable="false" />
  </EntityType>
  <EntityType Name="Users">
    <Key>
      <PropertyRef Name="ID" />
    </Key>
    <Property Name="ID" Type="int" StoreGeneratedPattern="Identity" Nullable="false" />
    <Property Name="Identity" Type="nvarchar" Nullable="false" MaxLength="100" />
    <Property Name="Password" Type="nvarchar" Nullable="false" MaxLength="100" />
    <Property Name="Name" Type="nvarchar" Nullable="false" MaxLength="100" />
    <Property Name="LastName" Type="nvarchar" Nullable="false" MaxLength="100" />
    <Property Name="Active" Type="bit" Nullable="false" DefaultValue="false" />
  </EntityType>
  <Association Name="Rel_User_Message">
    <End Role="users" Type="TestDbModel.Store.Users" Multiplicity="1" />
    <End Role="messages" Type="TestDbModel.Store.UserMessages" Multiplicity="*" />
    <ReferentialConstraint>
      <Principal Role="users">
        <PropertyRef Name="ID" />
      </Principal>
      <Dependent Role="messages">
        <PropertyRef Name="Author_ID" />
      </Dependent>
    </ReferentialConstraint>
  </Association>
</Schema></edmx:StorageModels>
    <!-- CSDL content -->
    <edmx:ConceptualModels>
      <Schema Namespace="TestDbModel" Alias="Self" xmlns:annotation="http://schemas.microsoft.com/ado/2009/02/edm/annotation" xmlns="http://schemas.microsoft.com/ado/2008/09/edm">
        <EntityContainer Name="TestDbEntities" annotation:LazyLoadingEnabled="true">
          <EntitySet Name="UserMessages" EntityType="TestDbModel.UserMessage" />
          <EntitySet Name="Users" EntityType="TestDbModel.User" />
          <AssociationSet Name="Rel_User_Message" Association="TestDbModel.Rel_User_Message">
            <End Role="users" EntitySet="Users" />
            <End Role="messages" EntitySet="UserMessages" />
          </AssociationSet>
        </EntityContainer>
        <EntityType Name="UserMessage">
          <Key>
            <PropertyRef Name="ID" />
          </Key>
          <Property Type="Int32" Name="ID" Nullable="false" annotation:StoreGeneratedPattern="Identity" />
          <Property Type="String" Name="Message" MaxLength="1000" FixedLength="false" Unicode="true" />
          <NavigationProperty Name="Author" Relationship="TestDbModel.Rel_User_Message" FromRole="messages" ToRole="users" />
        </EntityType>
        <EntityType Name="User">
          <Key>
            <PropertyRef Name="ID" />
          </Key>
          <Property Type="Int32" Name="ID" Nullable="false" annotation:StoreGeneratedPattern="Identity" />
          <Property Type="String" Name="Identity" MaxLength="100" FixedLength="false" Unicode="true" Nullable="false" />
          <Property Type="String" Name="Password" MaxLength="100" FixedLength="false" Unicode="true" Nullable="false" />
          <Property Type="String" Name="Name" MaxLength="100" FixedLength="false" Unicode="true" Nullable="false" />
          <Property Type="String" Name="LastName" MaxLength="100" FixedLength="false" Unicode="true" Nullable="false" />
          <Property Type="Boolean" Name="Active" Nullable="false" DefaultValue="False" />
          <NavigationProperty Name="AuthoredMessages" Relationship="TestDbModel.Rel_User_Message" FromRole="users" ToRole="messages" />
        </EntityType>
        <Association Name="Rel_User_Message">
          <End Type="TestDbModel.User" Role="users" Multiplicity="1" />
          <End Type="TestDbModel.UserMessage" Role="messages" 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="TestDbModelStoreContainer" CdmEntityContainer="TestDbEntities">
    <EntitySetMapping Name="UserMessages">
      <EntityTypeMapping TypeName="IsTypeOf(TestDbModel.UserMessage)">
        <MappingFragment StoreEntitySet="UserMessages">
          <ScalarProperty Name="ID" ColumnName="ID" />
          <ScalarProperty Name="Message" ColumnName="Message" />
        </MappingFragment>
      </EntityTypeMapping>
    </EntitySetMapping>
    <EntitySetMapping Name="Users">
      <EntityTypeMapping TypeName="IsTypeOf(TestDbModel.User)">
        <MappingFragment StoreEntitySet="Users">
          <ScalarProperty Name="ID" ColumnName="ID" />
          <ScalarProperty Name="Identity" ColumnName="Identity" />
          <ScalarProperty Name="Password" ColumnName="Password" />
          <ScalarProperty Name="Name" ColumnName="Name" />
          <ScalarProperty Name="LastName" ColumnName="LastName" />
          <ScalarProperty Name="Active" ColumnName="Active" />
        </MappingFragment>
      </EntityTypeMapping>
    </EntitySetMapping>
    <AssociationSetMapping Name="Rel_User_Message" TypeName="TestDbModel.Rel_User_Message" StoreEntitySet="UserMessages">
      <EndProperty Name="users">
        <ScalarProperty Name="ID" ColumnName="Author_ID" />
      </EndProperty>
      <EndProperty Name="messages">
        <ScalarProperty Name="ID" ColumnName="ID" />
      </EndProperty>
    </AssociationSetMapping>
  </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="False" />
        <DesignerProperty Name="IncludeForeignKeysInModel" Value="False" />
      </DesignerInfoPropertySet>
    </Options>
    <!-- Diagram content (shape and connector positions) -->
    <Diagrams>
      <Diagram Name="Model1">
        <EntityTypeShape EntityType="TestDbModel.UserMessage" Width="1.5" PointX="2.625" PointY="0.5" Height="1.5956835937499996" />
        <EntityTypeShape EntityType="TestDbModel.User" Width="1.5" PointX="0.5" PointY="0.5" Height="2.3648893229166665" />
        <AssociationConnector Association="TestDbModel.Rel_User_Message" >
          <ConnectorPoint PointX="2" PointY="1.2978417968749998" />
          <ConnectorPoint PointX="2.625" PointY="1.2978417968749998" />
        </AssociationConnector>
      </Diagram>
    </Diagrams>
  </Designer>
</edmx:Edmx>

C# (コード例)

User user = new User()
{
    Identity = name + "." + lastName,   // generated value
    Password = Convert.ToBase64String(password),  // generated value
    Name = name,                        // ...
    LastName = lastName,                // ...
    Active = rand.NextDouble() > 0.7   // 70% de chance d'être actif
};
ctx.AddToUsers(user);

try
{
    ctx.SaveChanges();

    Console.WriteLine("Created user #" + (i + 1) + " : " + user.Identity);
}
catch (Exception e)
{
    Console.WriteLine(e.InnerException);
    Console.WriteLine("Collision for name " + user.Identity);
}

スタック トレースのエラー

L'exception System.Data.UpdateException n'a pas été gérée
  Message=Une erreur s'est produite lors de la mise à jour des entrées. Pour plus d'informations, consultez l'exception interne.
  Source=System.Data.Entity
  StackTrace:
       à System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter)
       à System.Data.EntityClient.EntityAdapter.Update(IEntityStateManager entityCache)
       à System.Data.Objects.ObjectContext.SaveChanges(SaveOptions options)
       à System.Data.Objects.ObjectContext.SaveChanges()
       à TestApplication.entity.EntitiesTest.CreateTestDbEntities(TestDbEntities ctx) dans C:\Users\yrochon\Documents\Visual Studio 2010\Projects\TestApplication\TestApplication\entity\Entities.cs:ligne 119
       à TestApplication.entity.EntitiesTest.Test() dans C:\Users\yrochon\Documents\Visual Studio 2010\Projects\TestApplication\TestApplication\entity\Entities.cs:ligne 26
       à TestApplication.Program.Main(String[] args) dans C:\Users\yrochon\Documents\Visual Studio 2010\Projects\TestApplication\TestApplication\Program.cs:ligne 18
       à System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       à System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       à Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       à System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       à System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
       à System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       à System.Threading.ThreadHelper.ThreadStart()
  InnerException: System.Data.EntityCommandCompilationException
       Message=Une erreur s'est produite lors de la préparation de la définition de la commande. Pour plus de détails, consultez l'exception interne.
       Source=System.Data.Entity
       StackTrace:
            à System.Data.Mapping.Update.Internal.UpdateTranslator.CreateCommand(DbModificationCommandTree commandTree)
            à System.Data.Mapping.Update.Internal.DynamicUpdateCommand.CreateCommand(UpdateTranslator translator, Dictionary`2 identifierValues)
            à System.Data.Mapping.Update.Internal.DynamicUpdateCommand.Execute(UpdateTranslator translator, EntityConnection connection, Dictionary`2 identifierValues, List`1 generatedValues)
            à System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter)
       InnerException: System.NotSupportedException
            Message=Les clés et les valeurs générées par le serveur ne sont pas prises en charge par SQL Server Compact.
            Source=System.Data.SqlServerCe.Entity
            StackTrace:
                 à System.Data.SqlServerCe.SqlGen.DmlSqlGenerator.GenerateReturningSql(StringBuilder commandText, DbModificationCommandTree tree, ExpressionTranslator translator, DbExpression returning)
                 à System.Data.SqlServerCe.SqlGen.DmlSqlGenerator.GenerateInsertSql(DbInsertCommandTree tree, List`1& parameters, Boolean isLocalProvider)
                 à System.Data.SqlServerCe.SqlGen.SqlGenerator.GenerateSql(DbCommandTree tree, List`1& parameters, CommandType& commandType, Boolean isLocalProvider)
                 à System.Data.SqlServerCe.SqlCeProviderServices.CreateCommand(DbProviderManifest providerManifest, DbCommandTree commandTree)
                 à System.Data.SqlServerCe.SqlCeProviderServices.CreateDbCommandDefinition(DbProviderManifest providerManifest, DbCommandTree commandTree)
                 à System.Data.Common.DbProviderServices.CreateCommandDefinition(DbCommandTree commandTree)
                 à System.Data.Common.DbProviderServices.CreateCommand(DbCommandTree commandTree)
                 à System.Data.Mapping.Update.Internal.UpdateTranslator.CreateCommand(DbModificationCommandTree commandTree)
            InnerException:

これが唯一の解決策ですか？ID を手動で生成しますか (データベースによって自動インクリメントされることになっている場合でも)?

Answer 1

SQL Compact Edition をバージョン 4にアップグレードすると、ID が自動的にインクリメントされます。