Is having a return type of Task enough to make a method run asynchronously?

Question

I have a simple method that does a complicated string operation and returns the result. As you can see, the return type of this method is Task. Th

Answer 1

Based on your comments you need to do something like this:

public Task ComplexOperation()
{
    return Task.Run(() =>  /* Do something complex */);
}

You can play with it like this:

public static async Task Main()
{
    Console.WriteLine("Before" );
    var myResultTask = ComplexOperation();
    Console.WriteLine("After task creation");
    var result = await myResultTask;
    Console.WriteLine("After async await");
}

public Task ComplexOperation()
{    
    Console.WriteLine("Creation");
    return Task.Run(() =>
    {
        Console.WriteLine("In before work");
        Thread.Sleep(500); //simulate work;
        Console.WriteLine("In after work");
        return "Done";
    });
}

And compare the behavior with switching to your implementation when you just return Task.FromResult. Also it does not makes much sense in such test example, TBH.