Enable and Use CodeLens in Visual Studio 2022 for .NET Projects

Desired outcome

Enable the CodeLens feature in Visual Studio 2022 so that reference counts, recent changes, and unit‑test status appear inline above code members, allowing quick navigation and insight without leaving the editor.

Necessary prerequisites

• Visual Studio 2022 (Community, Professional, or Enterprise) installed.
• A solution that targets a supported .NET version (.NET Core, .NET Framework, or ASP.NET).
• Sufficient permissions to modify IDE options (no admin rights required).

Focused procedure

1. Open the Options dialog: From the main menu choose Tools → Options.
2. Navigate to CodeLens settings: Expand Text Editor → C# → CodeLens.
3. Enable the feature: Check the box labeled Enable CodeLens and click OK.
4. Load a .NET project: Open a solution or create a new console app (dotnet new console) to see CodeLens in action.
5. Observe CodeLens icons: Above each method, property, or class you should see small inline icons showing reference counts, a clock for recent changes, and a test tube for unit‑test status.
6. Navigate using CodeLens: Click the reference count icon (e.g., "3 References") to open a peek window that lists all usages; select an entry to jump directly to that location.
7. Verify unit‑test status: After building the solution, the test tube icon next to a test method will show "Passed" or "Failed". Run tests via Test → Run All Tests to see the status update.

Expected checks

• CodeLens icons are visible above code members after enabling the feature.
• Clicking a reference count opens a navigation list without opening a separate file tab.
• Unit‑test status changes after a test run and reflects the latest build.

Recovery options (rollback)

If CodeLens causes noticeable slowdown or memory pressure, you can disable it:

1. Return to Tools → Options → Text Editor → C# → CodeLens.
2. Uncheck Enable CodeLens and click OK.
3. Restart Visual Studio if the IDE feels unresponsive; the setting persists across sessions.

Limitations and practical verification

CodeLens is disabled by default for legacy project formats (e.g., older .csproj files without SDK‑style). In very large solutions the feature may increase startup time and memory usage; monitoring the IDE’s performance via Help → About Microsoft Visual Studio → Copy Product Information can help you decide whether to keep it enabled.

To verify that CodeLens is active for your specific project, open the Output window, select CodeLens from the dropdown, and look for messages such as "CodeLens service started" when the solution loads.