Asynchronous streaming based on IAsyncEnumerable has been present in ASP.NET Core since version 6. Despite being an important performance-related feature, most of the time I see one of three approaches to adopting it in projects: ignoring it completely, using it without much thought because it is labelled as good practice, or abandoning it when the first experiment doesn't yield noticeable results. In this talk, I want to systematise and deepen your knowledge of IAsyncEnumerable in ASP.NET Core Web APIs, enabling you to take a different approach.

Join me as we explore the changes that IAsyncEnumerable brings to ASP.NET Core Web APIs, the reasons why these changes are important from a performance perspective, and how you can ensure that your solution benefits fully from them. We will also discuss the limitations of the built-in support and how different techniques (such as NDJSON/JSONL) can be used to overcome them.