Call-hierarchy exploration for C# using Roslyn. Find who calls a method or what a method calls, across all projects in a solution — right from the editor.
Show Callers / Show Callees — right-click any C# method in the editor and pick CsCallGraph ▸ Show Callers (or Show Callees). The sidebar tree is populated from a full Roslyn analysis of your solution.
Direction toggle — switch the current root between callers and callees.
Copy Call Tree — copy the tree to the clipboard in tree format or indented JSON (Format: Tree / Format: JSON).
Open Location — click a call site to jump to the source line.
Empty state — placeholder nodes (No callers / No callees) when a method has no incoming/outgoing calls.
Requirements
Visual Studio Code ^1.96.0
.NET 10 runtime — the extension bundles the Roslyn analysis server, which runs on the .NET 10 runtime.
Usage
Open a folder (or window) that contains a .sln file. The extension auto-detects the solution, or set csCallGraph.solutionPath to override.
Open a C# file, place the cursor on a method, and right-click → CsCallGraph ▸ Show Callers / Show Callees.
Use the buttons in the sidebar title bar to toggle direction, copy the tree, or switch copy format.
Settings
Setting
Default
Description
csCallGraph.solutionPath
(empty)
Path to the .sln file (relative to workspace root). Auto-detected when empty.
Log LSP traffic and server stderr to the CsCallGraph output panel.
Troubleshooting
If the sidebar stays empty, open the CsCallGraph output panel (View → Output, then pick "CsCallGraph" from the dropdown). It shows:
which solution file was picked up (or why none was found),
which server build is being used,
LSP errors and the server's stderr when csCallGraph.debugLogging is on.
Limitations
Callable members only — not types. Analysis targets methods, constructors, properties, fields, events, indexers, operators, lambdas, and local functions. Right-clicking a class or interface name (or any type) produces no callers/callees — place the cursor on a member instead.
Requires the .NET 10 runtime. The analysis server is bundled inside the VSIX but runs on the .NET 10 runtime — it is not self-contained.
Solution-wide load. Each session loads the whole solution through Roslyn's MSBuild workspace. Very large solutions can take a while to load and use significant memory.
Bodyless symbols. Methods without a body — interface declarations, abstract methods, partial method declarations — have no callers/callees to analyze, so the view shows placeholder nodes (No callers / No callees).
First .sln wins. The extension auto-detects a solution by scanning the workspace (and parent folders) and uses the first .sln it finds. Projects outside that solution are not analyzed; set csCallGraph.solutionPath to point at another one.
C# only. Analysis uses Roslyn's C# compiler; Visual Basic is not supported.
Beta. Tested on Windows only; macOS and Linux are untested (but should work with the .NET 10 runtime installed).
Project
The analysis engine and CLI live in the CsCallGraphExplorer repository. The extension ships with the compiled analysis server bundled inside the VSIX.
