Display additional information in diagnostic

[YairHalberstadt]

I use a source generator to create an IOC container (see https://github.com/YairHalberstadt/stronginject).

Is there anyway to show a short description by default, but a longer one if the user needs it?

I want to show something like:

Error whilst resolving dependencies for type a: No available source for type b.

And then a longer description:

resolution path: a <- c <- ID[] <- D <- b

DiagnosticDescriptor has a field "description" which sounds promising:

        //   description:
        //     An optional longer description of the diagnostic.
public DiagnosticDescriptor(string id, string title, string messageFormat, string category, DiagnosticSeverity defaultSeverity, bool isEnabledByDefault, string? description = null, string? helpLinkUri = null, params string[] customTags)

However when I add something there I can't see it in Visual Studio, even if all the columns in the error list are shown.

[jmarolf]

That is the intended use case for description. @mavasani has anything changed here recently? The error list should still let you expand the diagnostic to see the whole description

[mavasani]

@jmarolf Currently we populate the description (and all fields from DiagnosticDescriptor) only for diagnostics reported from intellisense. There is an active item to ensure we do the same for diagnostics reported from build. Likely the case for @YairHalberstadt is for diagnostics coming from build?

[mavasani]

#57377

[YairHalberstadt]

Thanks!

As an aside, source generator diagnostics don't seem to assist in the error list without building, which is what causes this whole issue. Is that a bug?

[mavasani]

@jasonmalinowski - do we report diagnostics in the IDE from source generators only from build? If so, is there a work item tracking reporting them during live analysis?

[PathogenDavid]

is there a work item tracking reporting them during live analysis?

I'm not Jason, but it's tracked here: #49664

[jasonmalinowski]

Yep, that's it. 😄