Question

So i’m trying to learn how to program with Task’s and i’m doing an exercise:

public static int ReturnFirstResult(Func<int>[] funcs)
{
        Task[] tasks = new Task[funcs.Length];
        for (int i = 0; i < funcs.Length; i++)
        {
            tasks[i] = CreatingTask(funcs[i]);
        }
        return Task<int>.Factory.ContinueWhenAny(tasks, (firstTask) =>
                                                            {
                                                                Console.WriteLine(firstTask.Result);
                                                                return ***????***;
                                                            }).***Result***;
}
private static Task CreatingTask(Func<int> func)
{
        return Task<int>.Factory.StartNew(() => { return func.Invoke(); });
}

I’m giving a array of Funcs to run, the ideia is to returns the result of the first that func that was done.
The problem is that the field Result is not available…

What i’m missing here?

Answer 1

You’re returning Task from the CreatingTask method – you need to return Task<int>, and then change tasks to be Task<int>[] instead of Task[].

Basically, Task represents a task which doesn’t produce a result – whereas Task<T> represents a task producing a result of type T. In your case, everything throughout your code returns int, so you need Task<int> everywhere.