Indexing any C# project produced zero `references` edges, so
`codegraph_callers SomeDto` returned no hits even when the DTO was used
as a param/return type across the codebase, and `codegraph_callees` on
a service class only saw its `using` imports — the headline structural
query silently degraded to text-search on half of every typical backend
stack.
Two root causes:
1. `csharp.ts` was missing `returnField` (default `'return_type'` doesn't
exist on C# AST; the field is `'type'`) AND had
`paramsField:'parameter_list'` (the node TYPE, not the field NAME
`'parameters'`) — so parameter type extraction silently no-op'd.
2. `extractTypeRefsFromSubtree` only emitted refs for `type_identifier`
leaves. C# tree-sitter doesn't produce `type_identifier` — it uses
`identifier`, `predefined_type`, `qualified_name`, `generic_name`,
`array_type`, `nullable_type`, `tuple_type`, etc.
Fix:
- `csharp.ts`: `paramsField:'parameters'`, `returnField:'type'`.
- Route C# through a dedicated `extractCsharpTypeRefs` +
`walkCsharpTypePosition`. Descends ONLY into known type fields
(`parameter.type`, `method.type`, `property.type`,
`variable_declaration.type`, `tuple_element.type`), so parameter
NAMES like `request` in `Build(UserDto request)` never leak as type
refs.
- Hook `extractField` and `extractProperty` to call
`extractTypeAnnotations` so property/field type refs land in the graph.
Validation on dotnet/eShop (527 .cs files):
C# `references` edges: 35 -> 925 (+26x)
No regression in calls/imports/instantiates/extends/implements.
Closes#381.
Colby MchenryandGitHub
046e03a05f