Can't specify the 'async' modifier on the 'Main' method of a console app

Question

I am new to asynchronous programming with the async modifier. I am trying to figure out how to make sure that my Main method of a console applicati

Answer 1

If you're using C# 7.1 or later, go with the nawfal's answer and just change the return type of your Main method to Task or Task. If you are not:

• Have an async Task MainAsync like Johan said.
• Call its .GetAwaiter().GetResult() to catch the underlying exception like do0g said.
• Support cancellation like Cory said.
• A second CTRL+C should terminate the process immediately. (Thanks binki!)
• Handle OperationCancelledException - return an appropriate error code.

The final code looks like:

private static int Main(string[] args)
{
    var cts = new CancellationTokenSource();
    Console.CancelKeyPress += (s, e) =>
    {
        e.Cancel = !cts.IsCancellationRequested;
        cts.Cancel();
    };

    try
    {
        return MainAsync(args, cts.Token).GetAwaiter().GetResult();
    }
    catch (OperationCanceledException)
    {
        return 1223; // Cancelled.
    }
}

private static async Task MainAsync(string[] args, CancellationToken cancellationToken)
{
    // Your code...

    return await Task.FromResult(0); // Success.
}