02.2-structured-output

Chapter 2.2 -- Structured Output to a C# Record

Companion code for Generative AI in .NET, Chapter 2 sections 2.2.3 and 2.2.4.

Demonstrates IChatClient.GetResponseAsync<T>(...) -- one call extracts a strongly-typed FlightBooking record from a free-text confirmation message. Description attributes drive the auto-generated JSON schema sent with the request.

Run it

export OPENAI_API_KEY=sk-...
dotnet run --project samples/ch02-extensions-ai/02.2-structured-output

Manuscript reference

• Manuscript/Chapter-02.md, sections 2.2.3 (JSON Schema response format) and 2.2.4 (deserialization to records).
• Figure 2.3 ("Structured Output Pipeline").

Prerequisites

• .NET 9 SDK and an OpenAI API key (any provider that supports JSON mode works -- see the OpenAI / Azure OpenAI / Anthropic notes in the manuscript).