Another new feature in C# 7.1 is the ability to make a console app deal with Async. Have you ever written a test console app to call an async function; for example, what will this do?
static void Main(string[] args)
{
MyAsyncFunc();
Console.WriteLine("done");
}
static async Task MyAsyncFunc()
{
await Task.Delay(1000);
}
I’m pretty sure that I’ve been asked a question similar to this during an interview, and probably asked the question myself when interviewing others. The way around it in a console app previously was:
static void Main(string[] args)
{
MyAsyncFunc().GetAwaiter().GetResult();
Console.WriteLine("done");
}
However, in C# 7.1, you can do this:
static async Task Main(string[] args)
{
await MyAsyncFunc();
Console.WriteLine("done");
}
Upgrading the Project
Unlike other new features of 7.1, this feature doesn’t afford you the ability to “Control Dot” it. If you try to do this in C# 6, for example, it just won’t compile:
To upgrade, go to the Advanced tab in the Build menu (of project properties):
