Strange issue with System.Net.Http 4.2.0.0 not found

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The problem you’re facing is related to Visual Studio, especially 2017 which is shipped with System.Net.Http v4.2.0.0. However, adopting the new way whereby any references should be done via NuGet, latest version of System.Net.Http which is 4.3.3 contains the dll version 4.1.1.2.

The problem is that VS at build time and at run time as well will ignore your reference and it will try to reference the DLL it knows about.

How to fix it:

  • make sure that any references to System.Net.Http are done via NuGet
  • Build time errors: change extension of System.Net.Http.dll (or move it somewhere else…basically get rid of it) that is shipped with VS 2017 (c:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\MSBuild\Microsoft\Microsoft.NET.Build.Extensions\net461\lib\); if you’ve got a different version then the path will slightly differ, not much though

  • Runtime errors: add an assembly binding redirect

If you look online on google you’ll find a few open issues with Microsoft about this, so hopefully they’ll fix this in the future.

Hope this helps.

Update:

When looking at finding some permanent fixes for this issue to work on the build agents, noticed that if you migrate to the new NuGet PackageReference model (in .csproj not in packages.config) tends to work better. Here’s a link to the guide on how to do this upgrade: https://docs.microsoft.com/en-us/nuget/reference/migrate-packages-config-to-package-reference

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