# Async di ASP.NET Core (.NET)

> async/await di controller, CancellationToken, streaming responses, timeout, async filter, IAsyncEnumerable

- 20 pertanyaan wawancara
- Mid-Level
- [Pertanyaan Wawancara: .NET](https://sharpskill.dev/id/technologies/dotnet/pertanyaan-wawancara.md)

## 1. Mengapa menggunakan async/await di controller action ASP.NET Core?

**Jawaban**

Menggunakan async/await di controller membebaskan thread thread pool selama operasi I/O (database, API eksternal). Ini meningkatkan skalabilitas server dengan memungkinkan thread memproses request lain sambil menunggu. Tanpa async, thread tetap terblokir dan menghabiskan resource secara tidak perlu, membatasi jumlah request bersamaan.

## 2. Apa yang terjadi jika sebuah controller action mengembalikan Task<IActionResult> tanpa menggunakan async/await?

**Jawaban**

Mengembalikan Task<IActionResult> tanpa async/await berfungsi jika Anda langsung mengembalikan Task yang sudah ada (return dbContext.SaveChangesAsync();). Namun, tanpa keyword async, Anda tidak dapat menggunakan await di dalam body method. Sebagian besar waktu, menggunakan async memungkinkan menunggu beberapa operasi asinkron dan menangani error dengan try/catch.

## 3. Apa perbedaan antara ToList() dan ToListAsync() dalam sebuah controller action?

**Jawaban**

ToList() bersifat sinkron dan memblokir thread selama query database, membatasi skalabilitas. ToListAsync() bersifat asinkron dan membebaskan thread selama operasi I/O, memungkinkan server memproses request lain. Selalu gunakan ToListAsync() di controller untuk memaksimalkan jumlah request bersamaan yang didukung.

## 17 pertanyaan lagi tersedia

- Apa peran CancellationToken dalam controller action?
- Bagaimana cara mendapatkan CancellationToken dalam controller action ASP.NET Core?

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