Static Code Analysis for C#: Rules, Roslyn, and Practical Examples (video)

Learn how static code analysis works for C# and .NET — Roslyn analyzers, common rules, SOLID checks, and scanning GitHub repositories with CodeInspector.

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Static Code Analysis for C#: Rules, Roslyn, and Practical Examples. Here's the short version.

C# teams rely on static analysis to keep .NET codebases maintainable as they grow. Here is how C# static analysis works, what to look for, and how to fit scanning into your GitHub workflow.

How C# static analysis works. Most C# analyzers use Roslyn — the .NET compiler platform — to parse syntax trees and run semantic analysis. Findings reference file paths, line numbers, rule IDs, and often include remediation guidance.

Here's an example.

Common C# checks. Empty catch blocks and missing logging in error paths. Long methods and high cyclomatic complexity. Hardcoded passwords and connection strings. Async anti-patterns — blocking on Task.Result, Thread.Sleep in async code.

Example: dependency construction. Direct instantiation of concrete services can reduce testability. Static analysis may flag this as a potential dependency inversion issue:

Want to find these issues in your own code? Connect your GitHub repository to CodeInspector. You'll get findings with the file, line, severity, and a recommended fix, plus HTML and PDF reports for your team. Start free at codeinspector.app.

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