a lot of json source generator errors after updating to 8.0.200

[ivanjx]

so i have been working on a wpf project since dotnet 8.0.100 preview 7. today i just upgraded my sdk into dotnet 8.0.200 and now my json source generators are complaining with CS0102 and CS0111 with 0 code changes. my system text json package version is on 8..0.2. i tried cleaning the solution, deleting bin and obj, rebooting the pc, but none works. any idea on how to fix it? the only way to make the project run again now is to remove every single one of the json source generators. interestingly i also have mvvm toolkit source generator and regex source generator with 0 issues.

[huoyaoyuan]

i tried cleaning the solution, deleting bin and obj, rebooting the pc, but none works.

Source generator output is determined by your code and the version of generator. New SDK brings new generator and the output will deterministically be new version.

interestingly i also have mvvm toolkit source generator and regex source generator with 0 issues.

The generators are running fine. It's just outputting code that doesn't compile fine. The output of different generators are independent.

Can you paste some of your data models that triggers bad generated code?

@eiriktsarpalis

[ivanjx]

@huoyaoyuan even this below cause it to fail. i even removed everything else except for this one below and yet still error.

[JsonSerializable(typeof(Dictionary<string, string>))]
public partial class TheContext : JsonSerializerContext
{
}

[ivanjx]

what do these numbers mean? TheContext.DictionaryStringString.g.cs(13,142,13,165)

[colejohnson66]

(starting line, starting character, ending line, ending character). So, (13,142,13,165) means line 13 from characters 142 to 165.

[eiriktsarpalis]

Sharing a minimal reproduction might help here. Start by slowly removing code from the project in a way that doesn't impact the error. Once you get to a point where no more changes can be made without making the error going away, you have a minimal reproduction.

[ivanjx]

well thats another problem for me because creating a new project and adding the stj source generator works fine. even other projects in the same solution works fine. this is very localized to the specific wpf project i have been working on since dotnet 8 preview 7

[elgonzo]

Make a full backup of the solution directory containing the project. Then, and only then, start removing stuff from the project you are working on as @eiriktsarpalis suggested. After finishing troubleshooting (and hopefully having discovered the cause of the problem you observe) restore the solution directory to its current state from the backup you made. If the error could not be successfully be diagnosed or resolved, before restoring the solution directory make a copy of it, which is then the minimal reproduction that can be shared (make sure that it doesn't contain private or other things you don't want to share...)