Implementing Idempotent Commands in .NET MAUI

A user taps Submit, a retry fires, a sync engine redelivers, or a request reaches the server while its response is lost — technically different executions that mean the same business operation. Jorge Perales Diaz builds an idempotent command architecture for .NET MAUI so duplicates produce the same intended effect as a single run.

What you’ll learn

• Idempotency vs concurrency — why preventing concurrent execution isn’t the same as making repeated execution safe
• Designing an idempotent command — stable command IDs, command results, and a handler that detects and short-circuits duplicates
• Tracking processed commands — in-memory vs persistent idempotency stores, with expiration and cleanup
• Concurrent duplicates and MVVM — handling overlapping executions and wiring idempotent commands into ViewModels
• HTTP idempotency — idempotency keys on the wire, client vs server responsibilities, and the failure windows where a lost response causes duplicates

Read the full article for the handler implementation, persistence, tests, and when idempotency isn’t necessary.