Catching Exceptions in Async Tasks: A Guide for .NET Developers скачать в хорошем качестве

Catching Exceptions in Async Tasks: A Guide for .NET Developers

Learn how to handle exceptions in async tasks in your .NET Core applications. Safeguard your applications against unexpected errors when connecting to APIs like Google Sheets! --- This video is based on the question https://stackoverflow.com/q/69936264/ asked by the user 'Ertugrul' ( https://stackoverflow.com/u/14807271/ ) and on the answer https://stackoverflow.com/a/69936302/ provided by the user 'CorrieJanse' ( https://stackoverflow.com/u/15119845/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Catching exception in async Task which returns value Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- Catching Exceptions in Async Tasks: A Guide for .NET Developers When working with asynchronous programming in .NET Core, especially while connecting to external APIs like Google Sheets, you may encounter situations where exceptions can occur—such as losing your internet connection. In this guide, we will address this specific issue: how to effectively catch exceptions in an async task that returns a value. Understanding the Problem In your application, you have an async method that connects to Google Sheets and retrieves user information. The method looks something like this: [[See Video to Reveal this Text or Code Snippet]] The Issue at Hand The problem arises when there is no internet connection, leading to an exception when the API request is attempted. You may have tried using a try-catch block to catch this exception, but due to the async nature of the task and the use of Task.Run(), the exception is not caught in the way you might expect. The code might look like this: [[See Video to Reveal this Text or Code Snippet]] While this approach is logically sound, it fails because Task.Run() runs on a different thread, and exceptions occurring there are not caught by the surrounding try-catch statement. The Solution Remove Task.Run The first step towards a more effective solution is to remove the unnecessary wrapping of request.Execute() in Task.Run(). Since request execution is already asynchronous, your method can directly await it without the additional task wrapper. Here is how you can modify your method: [[See Video to Reveal this Text or Code Snippet]] This change simplifies your code and allows you to handle exceptions directly. Catching Exceptions in the Async Method To catch exceptions that occur during the API call, you can use a try-catch block directly around the awaited method, like this: [[See Video to Reveal this Text or Code Snippet]] Summary By following the steps outlined above, you can successfully catch exceptions in your asynchronous tasks while interacting with APIs such as Google Sheets. Remember that trying to execute synchronous methods asynchronously using Task.Run() often adds unnecessary complexity and can lead to confusion concerning exception handling. With this knowledge, you can ensure that your application is more robust and capable of handling network errors gracefully. Happy coding!