我使用的是.NET4.5.1、MVC5、EF6，以及Oracle.ManagedDataAccess 4.121.1.0和Oracle.ManagedDataAccess.EntityFramework 6.121.2.0
我能够从现有的数据库中生成模型（其中一部分是逐表添加的），应用程序构建得很好。
然而，当我尝试运行测试查询，看看它是否可以得到的数据

public ActionResult Cancellations()
    {
        var factoryClasses = System.Data.Common.DbProviderFactories.GetFactoryClasses();
        using (var db = new Entities())
        {
            var cancelationStatuses = new[] {3, 7, 9};
           var result = db.TRANSACTIONDETAIL.Where(o => cancelationStatuses.Contains(o.TRANSACTIONSTATUSID));
           return View(result);
        }
    }

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它失败（在var result = ...上），使用Unable to find the requested .Net Framework Data Provider. It may not be installed.
当尝试查找DbProviderFactories时，在collection（var factoryClasses =）中确实没有任何内容。
但是，I do have installed 12c 4 (ODTwithODAC121024)和11g（ODTwithODAC1120320_32bit）已重新启动计算机。
数据库在11g上运行，我可以使用PL/SQL developer

访问它
Web.config如下所示：

<configuration>
<configSections>
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
 <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
 <section name="Oracle.ManagedDataAccess.Client" type="OracleInternal.Common.ODPMSectionHandler, Oracle.ManagedDataAccess, Version=4.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342" />
</configSections>
.....
<connectionStrings>
.....
<add name="OracleDbContext" providerName="Oracle.ManagedDataAccess.Client" connectionString="User Id=oracle_user;Password=oracle_user_password;Data Source=oracle" />
 <add name="Entities" connectionString="metadata=res://*/OracleDb.csdl|res://*/OracleDb.ssdl|res://*/OracleDb.msl;provider=Oracle.ManagedDataAccess.Client;provider connection string='data source=******" providerName="System.Data.EntityClient" />           </connectionStrings>
......
<system.data>
<DbProviderFactories>
  <!-- Remove in case this is already defined in machine.config -->
  <add name="Oracle Data Provider for .NET" invariant="Oracle.ManagedDataAccess.Client" description="Oracle Data Provider for .NET" type="Oracle.ManagedDataAccess.Client.OracleClientFactory, Oracle.ManagedDataAccess, Version=4.121.1.0, Culture=neutral, PublicKeyToken=89b483f429c47342" />
  <remove invariant="Oracle.ManagedDataAccess.Client" />
  <add name="ODP.NET, Managed Driver" invariant="Oracle.ManagedDataAccess.Client" description="Oracle Data Provider for .NET, Managed Driver" type="Oracle.ManagedDataAccess.Client.OracleClientFactory, Oracle.ManagedDataAccess, Version=4.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342" />
</DbProviderFactories>

型
我假设它失败是因为Oracle没有在DbProviderFactories或其他地方注册

如何在DbProviderFactories中注册Oracle？如果不是这样，我的设置有什么问题？