Async Fire-and-Forget: Async Void, Task.Run(), or the 'Old Async Delegate'?

Asynchronous "start and ignore": Async Void, Task.Run() or other methods

In the world of asynchronous programming, the "start and forget" pattern is often used to perform tasks in a non-blocking manner. Traditionally, the "old async delegate" approach uses the BeginInvoke and EndInvoke methods to achieve this. However, with the introduction of async/await came a new syntax that promised to be more concise and potentially improve performance.

New asynchronous syntax: Async Void or Task.Run()?

The "new method" using async void eliminates the need for explicit call processing, but it requires each asynchronous method to contain an await statement, which can be problematic when processing existing synchronous methods that need to be refactored to asynchronous execution becomes cumbersome.

An alternative is to use Task.Run(). By wrapping a synchronized method in a Task.Run call, we can execute it asynchronously without modifying the original method:

<code>Task.Run(() => DoIt("Test2"));</code>

Performance considerations and error handling

Async/await generally performs better than older delegate methods because it uses a more efficient event-based mechanism. However, it is important to note that the error handling semantics of async void methods are trickier. Exceptions thrown in async void methods are not propagated to the caller, which can lead to unhandled crashes.

Asynchronous call of synchronous method

In order to call synchronous method A() asynchronously using async/await and avoid the complexity of the old method, we can use a wrapper method:

<code>async Task InvokeAsync(Action action)
{
    await Task.Yield();
    action();
}

InvokeAsync(DoIt);</code>

Summary

Be sure to consider the trade-offs when choosing between the old async delegate syntax and the new async void/Task.Run method. If error handling is a major issue, avoid using async void and choose Task.Run. If simplicity is crucial, the old asynchronous delegate methods may still be suitable, but Task.Run can provide a convenient and efficient alternative. Ultimately, the best approach will depend on the specific needs and constraints of the application.

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