By: Linda Ng in Asp.net Tutorials on 2023-06-01
When changing a function to an asynchronous function, there are several things to note:
Method signature: Change the return type of the method to
Trepresents the type of the result if applicable.
asynckeyword: Add the
asynckeyword to the method declaration.
awaitkeyword: Use the
awaitkeyword before calling asynchronous operations. This indicates that the method should asynchronously wait for the operation to complete.
Exception handling: Consider how exceptions will be handled. Asynchronous methods can throw exceptions, so it's important to handle them appropriately using
try/catchblocks or propagating them up the call stack.
Asynchronous alternatives: Use asynchronous alternatives for I/O-bound operations, such as
Write, etc. This allows the method to truly perform asynchronously.
Task cancellation: Consider supporting cancellation by using
CancellationTokenparameters and checking for cancellation requests using
Synchronization context: Be aware of the synchronization context in which the method executes. By default,
asyncmethods capture and resume on the same context, such as the UI context in a UI application. If you need to switch the context, you can use
ConfigureAwaitto specify whether to resume on the captured context or not.
Task completion: Ensure that the asynchronous operation is properly awaited and that the returned
Taskis used to observe the completion of the operation. Avoid using
Task.Waitsynchronously, as it can lead to deadlocks in certain scenarios.
Consistency: Consider the calling code and ensure that all the necessary methods and dependencies support asynchronous patterns.
Testing: Update unit tests to account for the asynchronous nature of the method. Use
Task-related assertions to properly test asynchronous code.
These are some general considerations when changing a function to an async function. However, each specific scenario may have additional considerations depending on the nature of the code and the requirements of the application.
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Severity Code Description Project File Line Suppression State Error CS1061 'string' does not contain a definition for 'Any' and no accessible extension method 'Any' accepting a first argument of type 'string' could be found (are you missing a using directive or an assembly reference?)