Posts tagged: Clean Architecture

What I Learned Rewriting a Blazor App with OpenCode

I recently used OpenCode to rewrite a large chunk of an existing Blazor Web App — .NET 10, EF Core, MudBlazor, ASP.NET Identity, Clean Architecture with vertical slices — and came out the other side with a much clearer sense of what an AI coding agent is genuinely good at, and where it'll quietly wreck your architecture if you let it. This isn't a tutorial on OpenCode's features. It's what actually happened: the specific .NET and Blazor mistakes I had to catch or undo, and the do's and don'ts I'd hand to another .NET developer deciding whether to trust OpenCode with something real.

Clean Architecture

EF Core

Exception-Driven Flow Control Is Lying to Your Callers

Relying on exceptions for outcomes you actually expect — a missing record, a failed validation rule — treats ordinary business decisions as catastrophic system faults. It hides intent, costs more at runtime than it needs to, and pushes noise into places that shouldn't have to deal with it, like Blazor components. This is a practical look at moving to the Result pattern instead: explicit success and failure as part of the method signature, no more defensive try/catch scattered through the UI, and a service layer that tells the truth about what it can actually do.