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When Should I Use Fire-and-Forget Async Methods in ASP.NET MVC?

Susan Sarandon
Susan SarandonOriginal
2025-01-12 19:43:44787browse

When Should I Use Fire-and-Forget Async Methods in ASP.NET MVC?

Fire-and-forget asynchronous methods in ASP.NET MVC

In ASP.NET MVC, "Fire-and-Forget" refers to the method of starting a task but not waiting for its completion. While this approach is generally not recommended for use in ASP.NET applications, it may be necessary in some cases, especially when dealing with asynchronous methods.

The risk of “fire and forget”

Using fire-and-forget for async methods can lead to unobserved exceptions. To mitigate this problem, you can:

  1. Handling exceptions manually: Use try/catch blocks to catch any exceptions in async methods and log them. However, this approach cannot handle exceptions that occur outside the method.
  2. Globally register task exceptions: Implement an event handler for TaskScheduler.UnobservedTaskException that is responsible for handling any unobserved task exceptions.

How to correctly call "fire-and-forget" asynchronous methods

Fire-and-forget asynchronous methods can be called using one of the following methods:

  1. Task.Run using Lambda function: Wrap the asynchronous method in a lambda function and use Task.Run to execute it on a separate thread. This is a simple and straightforward way to avoid potential problems associated with SynchronizationContext.
  2. BackgroundTaskManager: Utilize a custom task manager to register tasks to the ASP.NET runtime, allowing you to centrally handle exceptions.

Other notes

  • Use fire-and-forget only if you really don't need to wait for the task to complete.
  • Log any unobserved exceptions to prevent them from going unnoticed.

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