BadImageFormatException when migrating from ASP.Net Core 1.1 to 2.0

Question

I just migrated an ASP.Net Core 1.1 application to the new 2.0 version that was just released. Now I get the following exception:

System.BadImageFormatException: 'Could not load file or assembly 'dotnet-aspnet-codegenerator-design' or one of its dependencies. An attempt was made to load a program with an incorrect format.'

The exception is thrown on the following line (AddMvc):

public IServiceProvider ConfigureServices(IServiceCollection services)
{
    ...
    services.AddMvc(options =>
        {
            options.Filters.Add(new MiddlewareFilterAttribute(typeof(LocalizationPipeline)));
        })
        .AddJsonOptions(options =>
        {
            // Maintain property names during serialization. See:
            // https://github.com/aspnet/Announcements/issues/194
            options.SerializerSettings.ContractResolver = new DefaultContractResolver();
        })
        .AddViewLocalization(LanguageViewLocationExpanderFormat.Suffix)
        .AddDataAnnotationsLocalization();
}

I'm targeting the .Net Framework 4.7, using AnyCPU target platform. I'm using the win10-x64 RID if this is of any help. Every Nuget package is up to date etc.

Any idea? I've got no luck by googling.

Answer 1

the same exception occurred when I switched from x86 to x64 (after upgrading from core 1.1 to 2.0).

Since dotnet-aspnet-codegenerator-design is not really needed at runtime, I removed that reference. But then an identical exception occurred with the Microsoft.AspNetCore.Server.Kestrel.Transport.Libuv assembly.

Luckily, that problem was related to the fact I didn't change the .NET Core Runtime Identifier (RID). This was still set on win7-x86, so I changed it to win7-x64 and the Libuv devepency could load.

I hope there will be some fix for dotnet-aspnet-codegenerator-design since that dependency is probably necessary for scaffolding controllers and views...

Update: there is an issue for this on Github (https://github.com/aspnet/Scaffolding/issues/601)