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System.BadImageFormatException: Could not load file or assembly 'IBM.EntityFrameworkCore, Version=6.0.0.200

  • 1.  System.BadImageFormatException: Could not load file or assembly 'IBM.EntityFrameworkCore, Version=6.0.0.200

    Posted Mon April 04, 2022 09:57 AM
    I'm trying to use the .net6 osx packages to connect to our on prem db. It fails with the following error:

    Unhandled exception. System.BadImageFormatException: Could not load file or assembly 'IBM.EntityFrameworkCore, Version=6.0.0.200, Culture=neutral, PublicKeyToken=7c307b91aa13d208'. An attempt was made to load a program with an incorrect format.

File name: 'IBM.EntityFrameworkCore, Version=6.0.0.200, Culture=neutral, PublicKeyToken=7c307b91aa13d208'
   at DB2.NetCoreContext.OnConfiguring(DbContextOptionsBuilder optionsBuilder)
   at Microsoft.EntityFrameworkCore.DbContext.get_ContextServices()
   at Microsoft.EntityFrameworkCore.DbContext.get_InternalServiceProvider()
   at Microsoft.EntityFrameworkCore.DbContext.Microsoft.EntityFrameworkCore.Infrastructure.IInfrastructure<System.IServiceProvider>.get_Instance()
   at Microsoft.EntityFrameworkCore.Infrastructure.Internal.InfrastructureExtensions.GetService[TService](IInfrastructure`1 accessor)
   at Microsoft.EntityFrameworkCore.Infrastructure.AccessorExtensions.GetService[TService](IInfrastructure`1 accessor)
   at Microsoft.EntityFrameworkCore.Infrastructure.DatabaseFacade.get_Dependencies()
   at Microsoft.EntityFrameworkCore.Infrastructure.DatabaseFacade.Microsoft.EntityFrameworkCore.Storage.IDatabaseFacadeDependenciesAccessor.get_Dependencies()
   at Microsoft.EntityFrameworkCore.RelationalDatabaseFacadeExtensions.GetFacadeDependencies(DatabaseFacade databaseFacade)
   at Microsoft.EntityFrameworkCore.RelationalDatabaseFacadeExtensions.ExecuteSqlRaw(DatabaseFacade databaseFacade, String sql, IEnumerable`1 parameters)
   at Microsoft.EntityFrameworkCore.RelationalDatabaseFacadeExtensions.ExecuteSqlRaw(DatabaseFacade databaseFacade, String sql, Object[] parameters)
   at DB2.NetCoreContext.GetData() in /Users/danielkvist/mio/repos/RND/DB2/NetCoreContext.cs:line 23
​

    This is my context class:

    public class NetCoreContext : DbContext
{
    public NetCoreContext() : base()
    {
   
    }
    
    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        optionsBuilder.UseDb2(
            @"Server=<redacted>;Database=<redacted>;userid=<redacted>;password=<redacted>",
            p=>p.SetServerInfo(IBMDBServerType.AS400, IBMDBServerVersion.AS400_07_02));
    }

    public void GetData()
    {
        var query = "select * from <redacted> limit 10";
        var result = this.Database.ExecuteSqlRaw(query);
        
        Console.Write(result);
    }
}

    This is the project config:

    <Project Sdk="Microsoft.NET.Sdk">

    <PropertyGroup>
        <OutputType>Exe</OutputType>
        <TargetFramework>net6.0</TargetFramework>
        <ImplicitUsings>enable</ImplicitUsings>
        <Nullable>enable</Nullable>
    </PropertyGroup>
    
    <ItemGroup>
      <PackageReference Include="IBM.EntityFrameworkCore-osx" Version="6.0.0.200" />
    </ItemGroup>

</Project>

    And finally, dotnet info:

    $ dotnet --info
.NET SDK (reflecting any global.json):
 Version:   6.0.101
 Commit:    ef49f6213a

Runtime Environment:
 OS Name:     Mac OS X
 OS Version:  12.2
 OS Platform: Darwin
 RID:         osx.12-arm64
 Base Path:   /usr/local/share/dotnet/sdk/6.0.101/

Host (useful for support):
  Version: 6.0.1
  Commit:  3a25a7f1cc

.NET SDKs installed:
  6.0.101 [/usr/local/share/dotnet/sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 6.0.1 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 6.0.1 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]

To install additional .NET runtimes or SDKs:
  https://aka.ms/dotnet-download

     

    I've read through multiple guides, e.g.

    https://www.ibm.com/mysupport/s/question/0D50z000068AfvhCAC/could-not-load-file-or-assembly-ibmdatadb2?language=en_US
https://community.ibm.com/community/user/hybriddatamanagement/blogs/michelle-betbadal1/2020/04/29/getting-started-with-ibm-data-server-provider-for
https://www.ibm.com/support/pages/systembadimageformatexception-could-not-load-file-ibmdatadb2dll
https://stackoverflow.com/questions/30647897/ibm-db2-issue-system-badimageformatexception-could-not-load-file-or-assembly-i
https://stackoverflow.com/questions/59528086/system-badimageformatexception-while-connecting-to-db2-from-net
https://stackoverflow.com/questions/60458243/ibm-data-db2-core-throws-exception-in-azure-function-app
https://github.com/dotnet/runtime/issues/26404

    Any ideas why the dll won't load?

    ------------------------------
    Daniel Kvist
    ------------------------------


    #DataManagementGlobal
    #DataServerDrivers


  • 2.  RE: System.BadImageFormatException: Could not load file or assembly 'IBM.EntityFrameworkCore, Version=6.0.0.200

    Posted Thu June 23, 2022 02:29 PM
    dotnet --info states that you are using M1 Mac (not intel). IBM has not released a DB2 client for Apple Silicon Macs (M1)

    ------------------------------
    Prabhdeep Singh
    ------------------------------

    Original Message