Прекрасное: Metalama is an open-source patterns & architecture toolkit for C#.
C# has no pattern keyword. Metalama fixes that.

Define your team's patterns once: the compiler writes the repetitive parts at build time and enforces your rules as you type.

Write the pattern once, apply it everywhere. Aspects generate logging, caching, INotifyPropertyChanged, or your own patterns at compile time. The boilerplate never lands in your repo, so it never needs review or maintenance.

Enforce architecture as you type. Express dependency rules, naming conventions, and pattern guidelines in plain C# and get real-time feedback in the IDE, long before the pull request.

Your rules, enforced by the compiler. No agent, no human, no merge gets past them. Hand-written or AI-generated, every line is checked deterministically. When a pattern changes, you edit one file and the whole codebase follows at the next build.