Oracle .Net ManagedDataAccess Error: Could not loa

Question

I have a project that works locally, on our dev server, and on our production server.

When I try to run it on the test server, I get the error below, and I don't know what to do about it beyond stare at my screen blankly. Hints? Process to trace the issue to its source?

I've installed the NuGet package for Oracle 12.2, etc.

Could not load type 'OracleInternal.Common.ConfigBaseClass' from assembly 'Oracle.ManagedDataAccess, Version=4.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342'. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.TypeLoadException: Could not load type 'OracleInternal.Common.ConfigBaseClass' from assembly 'Oracle.ManagedDataAccess, Version=4.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342'.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[TypeLoadException: Could not load type 'OracleInternal.Common.ConfigBaseClass' from assembly 'Oracle.ManagedDataAccess, Version=4.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342'.]
Oracle.ManagedDataAccess.EntityFramework.EntityFrameworkProviderSettings.Oracle.ManagedDataAccess.EntityFramework.EFProviderSettings.IEFProviderSettings.get_TracingEnabled() +0 Oracle.ManagedDataAccess.EntityFramework.EFProviderSettings.InitializeProviderSettings() +111 Oracle.ManagedDataAccess.EntityFramework.EFOracleProviderServices..ctor() +629 Oracle.ManagedDataAccess.EntityFramework.EFOracleProviderServices..cctor() +28

[TypeInitializationException: The type initializer for 'Oracle.ManagedDataAccess.EntityFramework.EFOracleProviderServices' threw an exception.]
Oracle.ManagedDataAccess.EntityFramework.EFOracleProviderServices.get_Instance() +24

The Web.Config has the following blocks in it:

  <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>

AND

  <oracle.manageddataaccess.client>
    <version number="*">
      <dataSources>
        <dataSource alias="PVMDataSource" descriptor="(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=pdxcludds108.pacificorp.us)(PORT=11086))(CONNECT_DATA=(SERVICE_NAME=DDS1086.PACIFICORP.US))) " />
      </dataSources>
    </version>
  </oracle.manageddataaccess.client>
  <connectionStrings>
    <add name="OracleDbContext" providerName="Oracle.ManagedDataAccess.Client" connectionString="User Id=USERID;Password=WORKINGPASSWORD;Data Source=PVMDataSource" />
    <add name="PVMEntities" connectionString="metadata=res://*/Models.PVMModel.csdl|res://*/Models.PVMModel.ssdl|res://*/Models.PVMModel.msl;provider=Oracle.ManagedDataAccess.Client;provider connection string=&quot;DATA SOURCE=pdxcludds108.pacificorp.us:11086/DDS1086.PACIFICORP.US;PASSWORD=XXXXXXX;PERSIST SECURITY INFO=True;USER ID=XXX&quot;" providerName="System.Data.EntityClient" />
  </connectionStrings>

NOTE: There are other projects working on this server, they're just using a different version of the Oracle client for .Net. None of the others is using only the Managed driver. I am looking for a way to dig into this error, some hint as to where that type is sourced and loaded from.

Answer 1

You need to install the Oracle Client drivers. The .NET packages don't contain them; they provide a translation from the managed world to the unmanaged. The drivers are in the unmanaged world and need to be installed properly.

Answer 2

If removing the DLL from the GAC is not an option, consider getting the next version of oracle.managedData.access 12.2.1 and just put them on the server in the bin directory. Afterwards you need to add an assemblyBinding to your web.config file.

This way you get arround pulling the 12.1.2 version from the GAC during runtime that will case the error. You do not need to recompile your app against the new version.

      <dependentAssembly>
        <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-12.1.2.0" newVersion="12.2.1.0" />
      </dependentAssembly>

Answer 3

In my scenario, i have a console application consuming a class library database utility. I had to reference the Oracle.ManagedDataAccess also on the console application so it can find the dll on runtime. I don't know if this is the best approach, but worked for me.