How Can I Safely Invoke Asynchronous Methods in C# Without Awaiting?

Call asynchronous methods without using await in C#

Calling an asynchronous method without waiting can lead to potentially complex issues. This article explores solutions for safely calling asynchronous methods in C# without waiting for the result.

In the given scenario, the asynchronous method MyAsyncMethod is called from the GetStringData method which returns data. Not waiting generates a warning and suppresses the exception. To resolve this issue while avoiding wait calls, consider the following:

Use ContinueWith to handle exceptions:

<code class="language-csharp">MyAsyncMethod().ContinueWith(t => Console.WriteLine(t.Exception), TaskContinuationOptions.OnlyOnFaulted);</code>

This method allows exception handling on a separate thread. It does not require waiting on MyAsyncMethod on the calling thread, but provides a mechanism to handle any exceptions that may arise.

Try-Catch block using ConfigureAwait(false):

<code class="language-csharp">try
{
    MyAsyncMethod().ConfigureAwait(false); // 注意：这里去掉了 await
}
catch (Exception ex)
{
    Trace.WriteLine(ex);
}</code>

This method utilizes the ConfigureAwait(false) option to suppress warnings generated by asynchronous calls. It allows explicit handling of exceptions using try-catch blocks. The key difference is that instead of await MyAsyncMethod, we call ConfigureAwait(false) directly to avoid context switching.

Additional notes:

In the context of web requests (such as in ASP.NET Web API), it is critical to avoid waiting for asynchronous calls. This is because waiting delays the response to the request, possibly increasing response time. The solution provided allows asynchronous calls without hampering request processing speed.

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