Async streams
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The document discusses async streams in C# and covers topics such as the yield statement, asynchronous APIs, and libraries supporting async operations like SignalR and gRPC. It emphasizes the differences between synchronous and asynchronous programming and how tools like IAsyncEnumerable facilitate streaming results. The document also provides resources for further learning and includes links to source code.
Async streams
- 2. Christian Nagel • Training • Coaching • Consulting • Development • Microsoft MVP • www.cninnovation.com • csharp.christiannagel.com • @christiannagel
- 4. Foundations
- 5. What’s the yield statement? • yield return • yield break • Creates implementations for IEnumerator, IEnumerable
- 6. yield & foreach • yield implements IEnumerable and IEnumerator interfaces • foreach uses IEnumerable and IEnumerator interfaces
- 7. Asynchronous APIs • Task, ValueTask, GetAwaiter • Return a single result • IAsyncEnumerable • Return a result stream
- 10. Sync vs Async Sync • IDisposable • IEnumerable • IEnumerator Async • IAsyncDisposable • IAsyncEnumerable • IAsyncEnumerator
- 11. Libraries
- 12. Asynchronous Streaming with SignalR • SignalR: real-time server-client communication plus streaming • ChannelReader / ChannelWriter gives more control • IAsyncEnumerable available since .NET Core 3 • Async streaming is easier to use
- 13. SignalR - Server
- 14. SignalR - Client
- 15. gRPC • Platform-independent binary communication… • …including streaming
- 16. Async Streaming with gRPC - Server
- 17. Async Streaming with gRPC - Client
- 18. EF Core (.NET 6) • Mapping relational and NoSQL databases to objects • Stream results asynchronously with… • GetAsyncEnumerator • IAsyncEnumerator • AsAsyncEnumerable • IAsyncEnumerable
- 21. Azure Storage • Iterate through a large list of blobs • Working with the continuation token is abstracted • AsyncPageable implements IAsyncEnumerable
- 22. Summary • Task returns a result • IAsyncEnumerable returns a continuous stream of results • yield and foreach statements enhanced • Many libraries support async streams
- 23. Thank you! • Source code: https://github.com/christiannagel • More information: https://csharp.christiannagel.com