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I'm developing an application that runs on AutoCAD using .NET Framework 4.8 and Npgsql, following the MVVM pattern. In my project, I use Dependency Injection (DI) to manage the lifecycle of objects through Microsoft.Extensions.DependencyInjection. However, when I use this DI framework, I encounter a conflict and receive the following error:

Could not load file or assembly 'System.Threading.Tasks.Extensions, Version=4.2.0.0, Culture=neutral...'

If I remove Microsoft.Extensions.DependencyInjection, the program runs fine. I would like to know if there's a way to continue using DI in my project while ensuring Npgsql works without issues. I've also tried using Autofac for DI, but I encountered a similar error.

I also tried follow this answer but not working

I tried binding like this:

<dependentAssembly>
  <assemblyIdentity
    name="System.Threading.Tasks.Extensions"
    publicKeyToken="cc7b13ffcd2ddd51" culture="neutral" />
  <bindingRedirect
    oldVersion="0.0.0.0-4.2.0.0"
    newVersion="4.2.0.0" />
</dependentAssembly>

but it's not working.

Is there a solution to this problem?

I still want to use Dependency Injection (DI) and Npgsql. Is there a way to use both without causing conflicts or encountering the error Could not load file or assembly ?'System.Threading.Tasks.Extensions, Version=4.2.0.0 Culture=neutral

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  • Seems like you're missing some binding redirects. Commented Aug 12, 2024 at 15:07
  • I tried binding like this <dependentAssembly> <assemblyIdentity name="System.Threading.Tasks.Extensions" publicKeyToken="cc7b13ffcd2ddd51" culture="neutral" /> <bindingRedirect oldVersion="0.0.0.0-4.2.0.0" newVersion="4.2.0.0" /> </dependentAssembly> but it's not working. Could you please explain more details? Commented Aug 12, 2024 at 15:52
  • I bet the full exception message is "Could not load file or assembly ... or one of its dependencies". The problem could, therefore, very well lie in one of System.Threading.Tasks.Extensions's dependencies. I struggled with this myself a few years ago and found it very difficult to find the correct set of binding redirects as there is a quite complex dependency graph below it. Commented Aug 12, 2024 at 20:41
  • You could also consider suppressing binding redirects completely using AssemblyResolve. I use this method in my applications and it prevents me from having to specify a single binding redirect. Commented Aug 12, 2024 at 20:46
  • I tried update Version of Npgsql , error above solved but new other error.System.IO.FileNotFoundException: 'Could not load file or assembly 'System.Numerics.Vectors, Version=4.1.4.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. it's my Repository github.com/NguyenVung2305/SketchRoute please give me some advice! Commented Aug 14, 2024 at 3:13
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