.NET Recipes¶

Implementation-focused patterns for .NET isolated worker Azure Functions.

Recipe Categories¶

flowchart TD
    A[HTTP] --> B[Storage]
    B --> C[Security]
    C --> D[Advanced]

Recipe	Description
HTTP API Patterns	Route, request, response, and validation patterns.
HTTP Authentication	Function keys, platform auth, and token validation.
OpenAPI and Swagger	Auto-generating OpenAPI docs and Swagger UI with the isolated worker OpenAPI extension.

Recipe	Description
Cosmos DB	Input and output binding usage in isolated worker.
Blob Storage	Blob trigger and blob output handling.
Queue	Queue trigger, poison message, and output binding pattern.
Table Storage	Table input and output binding usage in isolated worker.

Recipe	Description
Key Vault	Secrets retrieval with managed identity.
Managed Identity	Passwordless access patterns to Azure services.
Custom Domain and Certificates	HTTPS endpoint hardening for function apps.

Recipe	Description
Timer	Cron schedules and idempotent scheduled jobs.
Durable Orchestration	Stateful workflows and fan-out/fan-in.
Durable Entities	Stateful, addressable per-key state (actor-style) with serialized operations.
Durable Advanced	Sub-orchestrations, eternal orchestrations, activity retries, and versioning.
Event Grid	Event-driven integration patterns.
Event Hubs	High-throughput event stream consumption with batch trigger and output binding.
Service Bus	Enterprise messaging with queue/topic triggers, dead-lettering, and output binding.
SignalR Service	Real-time messaging via the negotiate endpoint and output binding.
Dependency Injection	Registering services and constructor injection in the isolated worker container.
Retry Policies	Runtime retry policies (fixed delay, exponential backoff) for Timer, Event Hubs, and Cosmos DB triggers.
Middleware	Cross-cutting behavior with the isolated worker `IFunctionsWorkerMiddleware` pipeline.
Unit Testing	Host-free unit testing with xUnit, constructor injection, and Moq.
Migrate to Isolated	Migrating a .NET in-process app to the isolated worker model before the in-process retirement.