{"slug": "this-week-in-cursor-net-6-rules-3-essays-week-ending-may-31-2026", "title": "This week in Cursor + .NET — 6 rules + 3 essays (week ending May 31, 2026)", "summary": "A developer has published a six-rule framework for senior C#/.NET engineers using Cursor AI, addressing common issues like forgotten dependency injection patterns, EF Core N+1 query generation, and accidental async void deadlocks. The rules include guardrails for EF Core performance, a system to enforce sealed classes and value object records, and a drop-in Cursor rule that locks architectural conventions into the AI's long-term memory. The full kit is available for £19.99, with a free lite version on GitHub.", "body_md": "*Every weekday a single, opinionated rule for senior C#/.NET engineers using Cursor. Here's the full week in one read — canonical posts live on the Agentic Architect blog.*\n\n*Sat 30 May · .NET tooling*\n\nCursor forgets your DI patterns, boundaries, and conventions every session. Here's a 4-rule framework that locks your architecture into the AI's long-term memory.\n\n*Sat 30 May · .NET tooling*\n\nCursor AI generates N+1 queries, eager-loads entire databases, and skips AsNoTracking. Here's a rule-based guardrail system that catches 90% of EF Core mistakes before production.\n\n*Tue 26 May · .NET tooling*\n\nSenior .NET teams aren't picking - they're paying for both. The honest comparison, the pricing math, and the config that lets the two tools share state.\n\n*Sun 31 May*\n\nIn-memory EF Core providers lie. Use WebApplicationFactory with Testcontainers (SQL Server, Postgres) for real integration coverage. Cursor defaults to UseInMemoryDatabase — it passes locally and ships the bug to production. Flag the in-memory provider in test projects.\n\n*Sat 30 May*\n\nLibrary code (non-ASP.NET) should ConfigureAwait false on every awaited Task. ASP.NET Core code should not. Cursor mixes the two contexts in the same solution. Detect the project type and enforce the right default.\n\n*Fri 29 May*\n\nasync void is a deadlock and unhandled-exception trap everywhere except UI event handlers. The AI uses it routinely for \"fire and forget\" — wrong answer every time. Flag it on sight.\n\n*Thu 28 May*\n\nValue objects (Money, Address, Coordinates) should be records. Entities with identity (Order, Customer) should be classes with an Id. Cursor mixes these constantly. A rule that classifies based on the presence or absence of an identity property keeps the distinction honest.\n\n*Wed 27 May*\n\nMark every class sealed unless inheritance is explicitly planned. Stops Cursor inventing accidental inheritance hierarchies \"for flexibility.\" Small but measurable virtual-call perf wins too.\n\n*Mon 25 May*\n\nBusiness code should never call IConfiguration directly. Strongly-typed IOptions or IOptionsSnapshot bindings only. The AI loves to \"just grab the config value\" — refuse it and force a settings class with validation attributes.\n\nThe free is one drop-in Cursor rule that ends the morning re-explanation ritual. Install in 60 seconds, see whether Cursor actually remembers your DI lifetimes, and decide for yourself whether the full kit is worth £19.99.\n\n`arch-core-lite.mdc`\n\n`arch-core-lite.mdc`\n\non GitHubCanonical home for everything in this digest: [https://agenticstandardcontact-byte.github.io/agentic-architect/blog/](https://agenticstandardcontact-byte.github.io/agentic-architect/blog/).", "url": "https://wpnews.pro/news/this-week-in-cursor-net-6-rules-3-essays-week-ending-may-31-2026", "canonical_source": "https://dev.to/agentic_standard/this-week-in-cursor-net-6-rules-3-essays-week-ending-may-31-2026-3354", "published_at": "2026-05-31 11:51:26+00:00", "updated_at": "2026-05-31 12:12:37.609892+00:00", "lang": "en", "topics": ["ai-tools", "ai-products", "ai-infrastructure", "artificial-intelligence", "large-language-models"], "entities": ["Cursor", ".NET", "EF Core", "ASP.NET Core", "SQL Server", "Postgres", "Testcontainers", "Agentic Architect"], "alternates": {"html": "https://wpnews.pro/news/this-week-in-cursor-net-6-rules-3-essays-week-ending-may-31-2026", "markdown": "https://wpnews.pro/news/this-week-in-cursor-net-6-rules-3-essays-week-ending-may-31-2026.md", "text": "https://wpnews.pro/news/this-week-in-cursor-net-6-rules-3-essays-week-ending-may-31-2026.txt", "jsonld": "https://wpnews.pro/news/this-week-in-cursor-net-6-rules-3-essays-week-ending-may-31-2026.jsonld"}}