cad-todo-api

Scaffold a project with dotnet new webapi --use-controllers, create a model and an in-memory store registered as a singleton, then add a controller with GET, POST, and DELETE actions. The skill walks through this in five phases ending with a smoke test of all endpoints.

Create a TodosController with [ApiController] and [Route] attributes, inject the store via the constructor, and implement GET /todos, GET /todos/{id}, POST /todos with [FromBody], and DELETE /todos/{id}. Return CreatedAtAction for POST and 204 No Content for DELETE.

The default .NET 8 webapi template uses minimal APIs, which do not create a Controllers folder. Re-scaffold with dotnet new webapi --use-controllers to get the controllers-based project structure this skill uses.

Register the store as a singleton in the DI container with builder.Services.AddSingleton rather than using a static class. DI keeps the design testable and supports multiple instances later, and the controller receives the store through constructor injection.

All data is lost when the app restarts because state lives only in memory. For persistence across runs, the follow-on project cad-todo-api-ef adds EF Core with SQLite, and cad-deploy-app-service covers cloud deployment.