Tales from the .NET 8 Migration Trenches
summary
Migrates a large .NET 4.8 ASP.NET MVC app to .NET 8 incrementally by deploying an empty ASP.NET Core app that hosts system.web adapters and YARP as a reverse proxy, then porting one controller at a time with a shared multi-targeted library (using EF6 multi-targeting to avoid full EF Core rewrites). Shows discovery via reflection of endpoints, handling session and auth with remote APIs, moving DI from StructureMap to Lamar, preserving static assets with WebOptimizer and linked files, and deleting 500k lines once traffic fully shifts.
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chapters (11)
- 0:00.NET 8 migration challenges
- 3:22Incremental vs big bang rewrites
- 17:27System.Web Adapters and YARP
- 23:52Upgrade Assistant demo
- 31:35Deploy empty ASP.NET Core proxy
- 38:02Migrate first controller
- 46:15Bundling and minification hurdles
- 53:56Session state handling
- 57:51Hangfire in hybrid apps
- 1:00:00Final migration cleanup
- 1:02:28Key takeaways
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