Parent task does not wait for child task to complete

Question

So here is my code

Task parent = Task.Run(() =>
{
    var result = new int[3];

    TaskFactory tf = new TaskFactory(TaskCreationOptions.Atta         


        

Answer 1

Please use the code as below:

static void RunParentTask()
    {
        Task parent = Task.Factory.StartNew(() =>
        {
            var results = new int[3];

            TaskFactory factory = new TaskFactory(TaskCreationOptions.AttachedToParent,
                                                            TaskContinuationOptions.ExecuteSynchronously);
            factory.StartNew(() => results[0] = 1);
            factory.StartNew(() => results[1] = 2);
            factory.StartNew(() => results[2] = 3);

            return results;
        });

        parent.Wait();

        foreach (var item in parent.Result)
        {
            Console.WriteLine(item);
        }
    }