Unable to build using Newtonsoft.Json 12.0.1

[SpencerWaz]

Getting the same error as in this comment: here. Since this was posted after the issue was closed, I figured I'd continue the discussion here

Function SDK: 1.0.30-beta1
Newtonsoft.Json: 12.0.1

I'm able to restore the packages after #323 but when I build the project I'm getting the same error as above.

[deyanp]

Same for me, and if I reference Newtonsoft.Json 11.0.2 I get project reference issues with Jetbrains Rider/F#, see JetBrains/resharper-fsharp#61
What is the reason for insisting on 11.0.2?

[DeluxZ]

Same issue here. When referencing 12.0.2 I get two errors. One is a FileLoadException about Newtonsoft.Json which can not be found. The second one is about Metadata generation failed. When I remove 12.0.2 it's ok but I need 12.0.2 because our own package uses >=12.0.2. Worked perfectly until today.

Note: I have updated VS2019 to the latest version last friday.

'Fixed' it because of this comment

[AtOMiCNebula]

Have you read the FAQ in the README in the root of this repo? The strict version match is not there by accident.

[simonvane]

@AtOMiCNebula - I have read the FAQ in the README.

I am not using JObject so I don't need to stick to the same version as the runtime uses. The README says I can set the version I want to use in the project directly as does the build error I get:
NU1107: Version conflict detected for Newtonsoft.Json. Install/reference Newtonsoft.Json 12.0.2 directly to project <function project> to resolve this issue.

However, when I try to do that I get the following error and the change rolls back:
NU1608: Detected package version outside of dependency constraint: Microsoft.NET.Sdk.Functions 1.0.29 requires Newtonsoft.Json (= 11.0.2) but version Newtonsoft.Json 12.0.2 was resolved.

Any idea how can I resolve this issue?

[DeluxZ]

@simonvane Check the link I mentioned previously. Do you have any using to NewtonSoft in a file within your function app project? That caused the issue on my side.

[simonvane]

@simonvane Check the link I mentioned previously. Do you have any using to NewtonSoft in a file within your function app project? That caused the issue on my side.

Thanks @DeluxZ . I don't have using Newtonsoft.Json.Serialization; anywhere in my solution.

[DigitalMystery]

@simonvane did you ever resolve this? Running into the same thing and already checked the linked thread.

[simonvane]

@DigitalMystery I am now referencing the following in my function apps:

Solution a:

    <PackageReference Include="Microsoft.NET.Sdk.Functions" Version="1.0.29" />
    <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />

Solution b:

    <PackageReference Include="Microsoft.NET.Sdk.Functions" Version="1.0.30-beta4" />
    <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />

I have lost track of what I did to resolve it because I have encountered so many similar issues in recent months.

My two suggestions are:

1. Explicitly reference the version you want to use in all projects.
2. If you find that when you try to upgrade the version of a nuget pack and it fails and rolls back, try the following:
   a) close the solution
   b) run dotnet clean in the solution root
   c) add the reference to the project file(s) manually in a text editor and save the changes
   d) run dotnet restore in the solution root
   e) run dotnet build --no-restore in the solution root

[drdamour]

seems like this issue could be closed