System.IO.FileLoadException when trying to use Microsoft.Extensions.Configuration nuget package

Stacktrace:

System.TypeInitializationException: The type initializer for 'Submission#0' threw an exception. ---> System.IO.FileLoadException: Could not load file or assembly 'Microsoft.Extensions.Configuration, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. Could not find or load a specific file. (Exception from HRESULT: 0x80131621) ---> System.IO.FileLoadException: Could not load file or assembly 'Microsoft.Extensions.Configuration, Version=2.2.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'.
   at System.Runtime.Loader.AssemblyLoadContext.LoadFromPath(IntPtr ptrNativeAssemblyLoadContext, String ilPath, String niPath, ObjectHandleOnStack retAssembly)
   at System.Runtime.Loader.AssemblyLoadContext.LoadFromAssemblyPath(String assemblyPath)
   at System.Reflection.Assembly.LoadFrom(String assemblyFile)
   at System.Reflection.Assembly.LoadFromResolveHandler(Object sender, ResolveEventArgs args)
   at System.AppDomain.InvokeResolveEvent(ResolveEventHandler eventHandler, RuntimeAssembly assembly, String name)
   --- End of inner exception stack trace ---
   --- End of inner exception stack trace ---
   at Submission#0.<<Initialize>>d__0.MoveNext() in /Users/gldraphael/projects/misc/vi/config.csx:line 16
--- End of stack trace from previous location where exception was thrown ---
   at Dotnet.Script.Core.ScriptRunner.Execute[TReturn](String dllPath, IEnumerable`1 commandLineArgs) in C:\Users\appveyor\AppData\Local\Temp\tmp382F\Dotnet.Script.Core\ScriptRunner.cs:line 58

Here’s the config.csx file I’m trying to run:

#!/usr/bin/env dotnet-script
#r "nuget: Microsoft.Extensions.Configuration, 2.2.0"
#r "nuget: Microsoft.Extensions.Configuration.FileExtensions, 2.2.0"
#r "nuget: Microsoft.Extensions.Configuration.Json, 2.2.0"
#r "nuget: Microsoft.Extensions.Configuration.Binder, 2.2.0"

using Microsoft.Extensions.Configuration;

public static var config = new ConfigurationBuilder()
          .AddJsonFile("config.json", optional: false, reloadOnChange: true)
          .AddJsonFile("config.secrets.json", optional: true, reloadOnChange: true)
          .Build()
          .Get<Config>();
Console.WriteLine(config.Secret); // works if I comment this out, but then what's the point

public class Config 
{
    public string Secret { get; set; }
}

---

$ dotnet script --info
Version             : 0.28.0
Install location    : /Users/gldraphael/.dotnet/tools/.store/dotnet-script/0.28.0/dotnet-script/0.28.0/tools/netcoreapp2.1/any
Target framework    : netcoreapp2.1
.NET Core version   : 2.1.5
Platform identifier : osx
Runtime identifier  : osx-x64

[filipw]

dotnet-script has indirect dependency on Microsoft.Extensions.Configuration 2.1.1 which causes the issue, since that older version is already loaded into the runtime before you attempt to load yours from the script.

The most basic repro is:

(anything higher than 2.1.1 will break)

#r "nuget: Microsoft.Extensions.Configuration, 2.1.6"

using Microsoft.Extensions.Configuration;

var builder = typeof(ConfigurationBuilder);
Console.WriteLine(builder); 

We will try to come up with a fix, but for now, the recommended workaround is to use max. versions 2.1.1 of those config packages:

#!/usr/bin/env dotnet-script
#r "nuget: Microsoft.Extensions.Configuration, 2.1.1"
#r "nuget: Microsoft.Extensions.Configuration.FileExtensions, 2.1.1"
#r "nuget: Microsoft.Extensions.Configuration.Json, 2.1.1"
#r "nuget: Microsoft.Extensions.Configuration.Binder, 2.1.1"

using Microsoft.Extensions.Configuration;

public static var config = new ConfigurationBuilder()
          .AddJsonFile("config.json", optional: false, reloadOnChange: true)
          .AddJsonFile("config.secrets.json", optional: true, reloadOnChange: true)
          .Build()
          .Get<Config>();
Console.WriteLine(config.Secret); // should work now
public class Config 
{
    public string Secret { get; set; }
}

[drosenba]

Any solution here yet? I too am getting the same error when I use EPPlus.
System.IO.FileLoadException: Could not load file or assembly 'Microsoft.Extensions.Configuration, Version=3.1.5.0,

Happens when using only #r “nuget: EPPlus, 5.3.2”

and also when adding #r “nuget: Microsoft.Extensions.Configuration, 3.1.5”

Also happens if I copy the Microsoft.Extensions.Configuration.dll into the same folder as the .csx

(P.S. Works fine in LinqPad 😉