Learn prompt engineering in C# with runnable .NET examples: system prompts, few-shot, JSON output and prompt testing. Start writing better AI prompts today. Most C# developers can call an AI API in about ten lines of code. Getting reliable, predictable, production-quality output from it is harder. That part is prompt engineering . In this prompt engineering tutorial for C# developers, you'll learn how to write prompts that return consistent results. You'll also learn how to structure them in .NET code, get typed JSON back, defend against prompt injection and test prompts the way you test any other code. All examples use Microsoft.Extensions.AI , the provider-neutral abstraction for .NET. The same code works with OpenAI, Azure OpenAI, Anthropic Claude, Ollama or any other provider that supplies an IChatClient . Whether you're calling the OpenAI API from C#, building a ChatGPT-style feature or running a local model, these techniques carry over. What Is Prompt Engineer...
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