Question 1

How to implement Event Sourcing in a C# project like this?

Accepted Answer

Start by defining domain events and aggregates, as shown in Todo.cs, use an event store to persist changes, and create projections for read models, similar to the Handler.cs files in this implementation.

Question 2

What are the real benefits of CQRS for a todo app?

Accepted Answer

CQRS separates commands (e.g., adding todos) and queries (e.g., listing todos), allowing optimized read and write paths, though in simple apps like this, it's mainly for educational demonstration rather than performance gains.

Question 3

Event Sourcing vs traditional databases for audit logging?

Accepted Answer

Event Sourcing provides a complete, immutable history of all changes for free, enabling replay and multiple views, while traditional databases require manual logging and can lose context, as highlighted in the README's shopping cart example.

Question 4

How to extend this TodoMVC example to handle user authentication?

Accepted Answer

You'd need to add new events and commands for user actions, update aggregates to incorporate user context, and project read models that include user-specific data, ensuring consistency with the event log.

Question 5

Is DDD necessary for small projects or just overkill?

Accepted Answer

DDD helps structure complex domains with clear boundaries, but for small projects like todo lists, it can add unnecessary abstraction; this project uses it primarily for learning purposes.

Question 6

What tools are needed to run and test this project?

Accepted Answer

Requires Docker and Docker Compose to build and run containers, as per the README, with tests provided in DomainHandler.cs and EventHandler.cs for unit testing patterns.

TodoMVC-DDD-CQRS-EventSourcing

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