Swevo.PollyAnalyzers 1.0.1

PollyAnalyzers

Free, MIT-licensed Roslyn analyzers for async/resilience anti-patterns. No per-seat license required — ever.

Why PollyAnalyzers?

ReSharper (~$249+/seat/year) and similar commercial tools are broad style/inspection suites. Free tools like Roslynator and SonarLint already cover general C# code smells well. What none of them specifically targets is reliability: the handful of async/exception-handling mistakes that cause deadlocks, silent failures, and un-cancellable requests in production. PollyAnalyzers is a small, focused analyzer pack for exactly that gap, built by the same team that maintains 28+ Polly v8 resilience integration packages.

var data = httpClient.GetAsync(url).Result;              // PLY001: blocking call, deadlock risk
async void OnTimerElapsed(object? state) { ... }          // PLY002: async void, unobservable exceptions
SendWelcomeEmailAsync(order);                             // PLY003: fire-and-forget, exception lost
catch (Exception) { }                                     // PLY004: swallowed exception
await httpClient.GetAsync(url);                           // PLY005: cancellationToken in scope, not passed

Install

dotnet add package Swevo.PollyAnalyzers

Works automatically in Visual Studio, Rider, and VS Code (via the C# Dev Kit/OmniSharp Roslyn workspace) the moment the package is referenced — no separate IDE extension to install.

Rules

Each rule ships with one or more code fixes (Ctrl+. / Alt+Enter):

• PLY001 — replace with await (offered only inside an already-async method, since the fix can't safely make a sync method async and update every caller for you).
• PLY002 — change the return type to Task.
• PLY003 — discard with _ = (always safe), or await the call (offered inside async methods).
• PLY004 — insert throw; to rethrow instead of swallowing.
• PLY005 — append the in-scope CancellationToken as the call's last argument.

Suppressing a rule

Standard Roslyn suppression applies — per line:

#pragma warning disable PLY001
var data = httpClient.GetAsync(url).Result;
#pragma warning restore PLY001

or per-project via .editorconfig:

dotnet_diagnostic.PLY001.severity = none

Design goals

• MIT licensed, forever. No commercial tier, no per-seat fees.
• Narrow and precise. Five rules that catch real production incidents, not hundreds of style opinions — pairs cleanly alongside Roslynator/SonarLint rather than competing with them.
• Actionable. Every rule ships with a code fix, not just a warning.

Roadmap

• Additional rules are being considered based on real-world false-positive/false-negative feedback: HttpClient calls with no timeout or retry policy configured, and ConfigureAwait(false) guidance for library code.

💼 Need .NET consulting?

I'm the author of PollyAnalyzers and a suite of compile-time source generators (AutoWire, AutoMap.Generator) and 28+ Polly v8 resilience packages. I'm available for consulting on Polly v8 resilience, Azure cloud architecture, and clean .NET design.

→ solidqualitysolutions.com · LinkedIn

Also by the same author

🌐 Full suite overview: swevo.github.io

License

MIT © Justin Bannister