dotnet/roslyn

Code lens don't show implicit inheritance constructor usage

Open

#79656 opened on Jul 29, 2025

View on GitHub
 (1 comment) (0 reactions) (0 assignees)C# (20,414 stars) (4,257 forks)batch import
Area-IDEhelp wanted

Description

Version Used: 17.14.9 P1

Steps to Reproduce:

public class A
{
    public A()
    {
    }
}

public class B : A
{
}

Expected Behavior: Code lens over constructor of A should show 1 usage and point to A in B : A syntax

Actual Behavior: Code lens shows 0 constructor usages

Contributor guide

Tech stack
csharp
Domain
developer experience
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
C# knowledgeUnderstanding of Roslyn code lens infrastructure
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65
Research direction
The issue involves the code lens feature in Roslyn that shows constructor usages. The bug is that implicit inheritance constructor usages (like the base class constructor called via `: base()` or implicit in class declaration) are not counted. Likely the code lens provider for constructors is in the `Features` layer, possibly in `CodeLens` or `FindReferences` folders. Start by examining the constructor usage finder or the code lens data source to see how usages are collected. Check if there is a special handling for implicit constructor references from derived classes.