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Dotnet 8 to .NET 9 Migration Guide

Guide .NET 8 projects through migration to .NET 9 with readiness reports.

Updated Dec 1, 2025
Search Tags:#migration#dotnet#.NET 9#csproj#net9
One-click install
npx skills add https://github.com/lawless-m/Camola --skill dotnet-8-to-net-9-migration-guide
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: Dotnet 8 to .NET 9 Migration Guide
Source: https://github.com/lawless-m/Camola/tree/main/.claude/skills/Dotnet 8 to 9
Command: npx skills add https://github.com/lawless-m/Camola --skill dotnet-8-to-net-9-migration-guide

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill provides a practical migration roadmap from .NET 8 to .NET 9, covering compatibility, project structure, and tooling adjustments.

Core Features & Use Cases

  • Pre-migration prep: Steps to prepare code for future migration (in Claude for Web or limited SDKs).
  • Full migration: Instructions for upgrading target frameworks, packages, and APIs.
  • Validation patterns: Checks to ensure builds pass post-migration.

Quick Start

Run a pre-migration analysis to identify string literal issues and implicit usings conflicts.

Frequently Asked Questions about Dotnet 8 to .NET 9 Migration Guide

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I prepare my .NET 8 project for migration to .NET 9?▼

Pre-migration preparation identifies compatibility issues before upgrading. Run analysis to detect string literal problems, implicit usings conflicts, and package incompatibilities. This readiness report guides you through resolving issues step-by-step and documents entry points for a smoother transition.

What compatibility issues should I watch for when upgrading from .NET 8 to .NET 9?▼

Key migration blockers include string literal breaking changes, ImplicitUsings conflicts with explicit Main methods, TestData compilation failures, and package version incompatibilities. The migration guide validates each category and provides resolution steps for build success.

Can I migrate incrementally, or must I upgrade my entire csproj at once?▼

Migration supports both modes: pre-migration prep for staged readiness checks in Claude for Web, and full migration for complete target framework upgrades. Choose the approach that fits your project's complexity and deployment schedule.

How do I know if my dependencies support .NET 9 before migrating?▼

.NET 9 migration includes package compatibility checks that flag unsupported or outdated dependencies. The process validates your current package versions against .NET 9 requirements and recommends updates needed before upgrading your target framework.

What happens to my test projects during .NET 8 to .NET 9 migration?▼

Migration handles TestData compilation and test project structure adjustments as part of the upgrade path. The guidance ensures test infrastructure remains compatible and validates that builds pass post-migration across all project types.

Do I need to rewrite code for .NET 9, or are most changes in configuration?▼

.NET 9 migration is primarily structural: updating target frameworks in csproj files, resolving string literal syntax, managing implicit usings, and updating packages. Code rewrites are minimal unless specific APIs were deprecated between versions.

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