How Can I Safely Call Async Methods in C# Without Using `await`?

Avoiding await in C#: Safely Handling Asynchronous Method Calls

Directly calling asynchronous methods without using await can lead to compiler warnings and potentially masked exceptions. This article explores safe alternatives for invoking async methods in such situations.

Addressing Compiler Warnings

Ignoring the compiler's warning about missing await is risky. While suppressing the warning might seem convenient, it's only advisable if you're absolutely certain the asynchronous method won't throw exceptions. This is often an unreliable assumption.

Utilizing ContinueWith for Asynchronous Exception Handling

The ContinueWith method provides a robust solution. It allows for exception handling on a separate thread, preventing blocking of the main thread. Example:

MyAsyncMethod().ContinueWith(t => 
{
    if (t.IsFaulted)
    {
        Console.WriteLine(t.Exception);
    }
}, TaskContinuationOptions.OnlyOnFaulted);

This code ensures that any exceptions from MyAsyncMethod() are caught and logged asynchronously.

Employing await with ConfigureAwait(false)

Another approach involves using await with ConfigureAwait(false):

try
{
    await MyAsyncMethod().ConfigureAwait(false);
}
catch (Exception ex)
{
    Trace.WriteLine(ex);
}

This offers error handling without the complete synchronous wait associated with await. ConfigureAwait(false) prevents the continuation from being scheduled on a specific synchronization context, potentially improving performance and avoiding context switching issues.

Best Practices for Web Services (ASP.NET Web API)

In web service development (like ASP.NET Web API), awaiting async operations can impact response times. The methods described above are crucial for handling exceptions effectively without compromising performance. Prioritize asynchronous exception handling to maintain responsiveness and reliability.

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