Unhandled Task Cancellation Exception in C# 10 Async Method with CancellationToken in ASP.NET Core
I've spent hours debugging this and I'm trying to configure I tried several approaches but none seem to work..... I recently switched to I'm currently developing an ASP.NET Core 6 application that involves multiple asynchronous operations, and I'm facing a problem with unhandled `TaskCanceledException` when using `CancellationToken` in my async methods. I have a service that retrieves data from an external API and I'm allowing users to cancel this operation through a button in the UI. Here's a simplified version of my code: ```csharp public class DataService { private readonly HttpClient _httpClient; public DataService(HttpClient httpClient) { _httpClient = httpClient; } public async Task<string> GetDataAsync(CancellationToken cancellationToken) { try { var response = await _httpClient.GetAsync("https://api.example.com/data", cancellationToken); response.EnsureSuccessStatusCode(); return await response.Content.ReadAsStringAsync(); } catch (TaskCanceledException) { // Log and handle cancellation Console.WriteLine("Request was canceled"); return string.Empty; } catch (Exception ex) { // Handle other exceptions Console.WriteLine(ex.Message); throw; } } } ``` In my controller, I invoke this method and pass a `CancellationToken` from the request: ```csharp [HttpGet] public async Task<IActionResult> GetData(CancellationToken cancellationToken) { var data = await _dataService.GetDataAsync(cancellationToken); return Ok(data); } ``` The issue arises when the user clicks the cancel button while the API call is still ongoing. I see the following message in the logs: `Unhandled TaskCanceledException: The operation was canceled`. This exception is caught in the service method, but it seems to propagate further up and causes an unhandled exception in the controller context. I've tried ensuring that the `CancellationToken` is being passed correctly. However, I suspect there may be something more subtle causing the exception to bubble up. How can I properly manage this cancellation so that it doesn’t lead to unhandled exceptions that affect the overall application flow? Any insights would be greatly appreciated! This is part of a larger CLI tool I'm building. Any ideas what could be causing this? I recently upgraded to C# LTS. Is there a simpler solution I'm overlooking? Am I missing something obvious? This is happening in both development and production on macOS. Thanks, I really appreciate it! What's the best practice here?