Await vs. Task.Result: When Should I Use Each in C#?

Best practices of Await and Task.Result in C# asynchronous programming

Asynchronous programming in C# often involves Tasks, which encapsulate long-running units of work. Two common ways to handle tasks are await and Task.Result. While both can achieve similar results, there are subtle differences in their behavior.

The

await keyword will suspend the execution of the current method until the waiting task is completed. For a fully completed task, the await expression directly returns the result of the task, making the code cleaner and potentially improving performance.

In contrast, Task.Result retrieves the results of the task immediately. If the task fails, it will throw a AggregateException exception and may cause a deadlock in some asynchronous scenarios. Therefore, it is generally recommended to use await instead of Task.Result.

Stephen Cleary recommends using await instead of Task.Result, mainly for the following two reasons:

1. Exception handling: await does not wrap exceptions in AggregateException, simplifying error management in asynchronous code.
2. Avoid deadlocks: Result and Wait can cause deadlocks, especially when used within an asynchronous method. await Eliminate this risk by ensuring task completion before resuming execution.

Usage Guide:

As recommended by Cleary, the following guidelines apply to the use of Result, Wait and await:

• Asynchronous application code: Always use await.
• Asynchronous utility code: Result and Wait can be used with caution and with appropriate documentation.
• Parallel task codes: Result and Wait are appropriate.

Following these guidelines ensures correct handling of asynchronous code, minimizes deadlocks, and simplifies error handling.

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