Question

我有一个旧的数据库优先EF 6.1模型，我想将其转换为代码优先。

我使用了Microsoft的EF Power Tools来执行逆向工程。但是由于我已经进行了少量调整，我重用了由DB-first的T4模板生成的旧.cs文件。这些调整包括（据我记得）：

将类重命名为可读名称，将表名保留为原始名称。例如。我有一个表sottogruppi，它映射到sottogruppi类和sottogruppi DbSet。我使用大写S
抑制很多一对多关联，同时在EDMX模型中保持相反的多对一
在共享相同列名的几个实体中扩展公共接口。这最初是在部分扩展文件中完成的，现在它是在原始模型类
将某些关系属性重命名为可读名称

现在我已经找到了一个好的DbContext，看起来如下（仅为几个实体提供示例）

public class ContosoModel {
    public virtual DbSet<SezioneA> sezione_a { get; set; }
    public virtual DbSet<SezioneD> sezione_d { get; set; }
    public virtual DbSet<SezioneE> sezione_e { get; set; }
    public virtual DbSet<SezioneF> sezione_f { get; set; }
    public virtual DbSet<SezioneH> sezione_h { get; set; }



    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);

        modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
        modelBuilder.Conventions.Remove<PluralizingEntitySetNameConvention>();

        modelBuilder.Configurations.Add(new SezioneAMap());
        modelBuilder.Configurations.Add(new SezioneDMap());
        modelBuilder.Configurations.Add(new SezioneEMap());
        modelBuilder.Configurations.Add(new SezioneFMap());
        modelBuilder.Configurations.Add(new SezioneGMap());
        modelBuilder.Configurations.Add(new SezioneHMap());

    }
}

public partial class SezioneA : IStandardColumns
{

    public bool IsValid(bool isStornoContabile)
    {
        if (isStornoContabile)
        {
            return A54a != "4";
        }
        else
        {
            return A54a != "2" && A54a != "3";
        }
    }


    public string A01 { get; set; }
    public string A01a { get; set; }
    public string A01b { get; set; }
    public string A02 { get; set; }
    public string A03 { get; set; }
    public string A11 { get; set; }
    public string A12 { get; set; }
    public string A12a { get; set; }
    public string A12b { get; set; }
    public string A12c { get; set; }
    public string A21 { get; set; }
    public string A22 { get; set; }
    public string A23 { get; set; }
    public string A24 { get; set; }
    public string A25 { get; set; }
    public string A31 { get; set; }


public partial class SezioneA : ISharedColumns
{

    public string A01 { get; set; }
    public string A01a { get; set; }
    public string A01b { get; set; }
    public string A02 { get; set; }
    public string A03 { get; set; }
    public string A11 { get; set; }
    public string A12 { get; set; }
    public string A12a { get; set; }
    public string A12b { get; set; }
    public string A12c { get; set; }
    public string A21 { get; set; }
    public string A22 { get; set; }
    public string A23 { get; set; }
    public string A24 { get; set; }
    public string A25 { get; set; }
    public string A31 { get; set; }

    [...plenties more...]
}


    public SezioneAMap()
    {
        // Primary Key
        this.HasKey(t => new { t.progA, t.utente });

        // Properties
        this.Property(t => t.A01)
            .IsRequired()
            .HasMaxLength(13);

        this.Property(t => t.A01a)
            .IsRequired()
            .HasMaxLength(2);

        this.Property(t => t.A01b)
            .IsRequired()
            .HasMaxLength(11);
    }

等等......

当我尝试使用Web.xml支持的Mysql设置启动应用程序时，我收到一个关于真正不属于的实体类型的错误

这是web.xml

  <entityFramework codeConfigurationType="MySql.Data.Entity.MySqlEFConfiguration, MySql.Data.Entity.EF6">
    <!--codeConfigurationType="MySql.Data.Entity.MySqlEFConfiguration, MySql.Data.Entity.EF6">-->
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework">
      <parameters>
        <parameter value="v11.0" />
      </parameters>
    </defaultConnectionFactory>
    <providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
      <provider invariantName="MySql.Data.MySqlClient" type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6, Version=6.9.9.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d"></provider>
    </providers>
  </entityFramework>

<add name="connString"
     connectionString="Server=HOST;Database=DB;Uid=root;Pwd=root;Allow Zero Datetime=True;CharSet=latin1;Pooling=True;Min Pool Size=45"
     providerName="MySql.Data.MySqlClient" />

错误是.....

Com.Contoso.Model.Expression: : EntityType 'Expression' has no key defined. Define the key for this EntityType.
Com.Contoso.Model.ElementInit: : EntityType 'ElementInit' has no key defined. Define the key for this EntityType.
Com.Contoso.Model.MemberBinding: : EntityType 'MemberBinding' has no key defined. Define the key for this EntityType.
Com.Contoso.Model.MemberInfo: : EntityType 'MemberInfo' has no key defined. Define the key for this EntityType.
Com.Contoso.Model.SwitchCase: : EntityType 'SwitchCase' has no key defined. Define the key for this EntityType.
Com.Contoso.Model.CatchBlock: : EntityType 'CatchBlock' has no key defined. Define the key for this EntityType.
Expressions: EntityType: EntitySet 'Expressions' is based on type 'Expression' that has no keys defined.
ElementInits: EntityType: EntitySet 'ElementInits' is based on type 'ElementInit' that has no keys defined.
MemberBindings: EntityType: EntitySet 'MemberBindings' is based on type 'MemberBinding' that has no keys defined.
MemberInfoes: EntityType: EntitySet 'MemberInfoes' is based on type 'MemberInfo' that has no keys defined.
SwitchCases: EntityType: EntitySet 'SwitchCases' is based on type 'SwitchCase' that has no keys defined.
CatchBlocks: EntityType: EntitySet 'CatchBlocks' is based on type 'CatchBlock' that has no keys defined.

堆栈追踪：

   System.Data.Entity.Core.Metadata.Edm.EdmModel.Validate() +320
   System.Data.Entity.DbModelBuilder.Build(DbProviderManifest providerManifest, DbProviderInfo providerInfo) +588
   System.Data.Entity.DbModelBuilder.Build(DbConnection providerConnection) +138
   System.Data.Entity.Internal.LazyInternalContext.CreateModel(LazyInternalContext internalContext) +196
   System.Data.Entity.Internal.RetryLazy`2.GetValue(TInput input) +276
   System.Data.Entity.Internal.LazyInternalContext.InitializeContext() +791
   System.Data.Entity.Internal.InternalContext.Initialize() +52
   System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType) +53
   System.Data.Entity.Internal.Linq.InternalSet`1.Initialize() +193
   System.Data.Entity.Internal.Linq.InternalSet`1.get_InternalContext() +58
   System.Data.Entity.Infrastructure.DbQuery`1.System.Linq.IQueryable.get_Provider() +141
   System.Linq.Queryable.Cast(IQueryable source) +47
   Com.Contoso.NewsManager.FindAllValid() in NewsManagerImpl.cs:16

问题是直截了当的：我该如何解决这些问题？我是否需要粘贴其他信息？

其他信息：

此类实体名称在我的上下文中根本不存在
尽管有一些非规范化的表，但都有一个主键，而映射文件包含 HasKey调用

更新：这可能是由不规则的关系映射引起的。我只能认为HasRequired / HasOptional / WithMany等等System.Linq.Expressions.Expression。我正在调查更多，如果找到不合适的地方，我会发布额外的代码

Answer 1

我不明白为什么会这样，但我的问题已经解决了。

modelBuilder.Ignore<System.Linq.Expressions.Expression>();

我正确地猜到这与LINQ相关的类有关，可能是因为内置的约定？我不知道。但绝对违规的实体名称Contoso.Model.Expression完全不正确。

神秘的EntityTypes在我的反向工程DbContext中，没有键

错误是.....

1 个答案: