Run Multiple Tasks (Variable Number) in parallel and continue when all have finished

Question

I need to start a "number" of tasks (variable but less than 10) not in parallel, and wait for them all to finish, getting from each the result. I'm getting the result from each of them, saving in a list and then using it in the end.

Here's my code, and it's working but I think there gotta be a cleaner way to do that.

CAUSING THE NUMBER OF TASKS

List<String> Arguments = new List<String> { "AA", "BB", "CC" }; 

List<String> ResultList = new List<String>();  

//**AT LEAST I'VE GOT ONE**

Task<String> Tasks = Task<String>.Factory.StartNew(() =>
{
    return DoSomething(Arguments[0]);
});

ResultList.Add(Tasks.Result);

for (Int32 i = 1; i < Arguments.Count; i++)
{
    ResultList.Add(Tasks.ContinueWith<String>(Result =>
    {
        return DoSomething(Arguments[i]);

    }).Result);
}

//**DO I NEED THIS?? It's working even without!!**
//Tasks.Wait();

for (Int32 i = 0; i < ResultList.Count; i++)
{
    textBox1.AppendText(ResultList[i] + Environment.NewLine + Environment.NewLine);
}

Answer 1

I think this is what you are attempting to do : ie start a whole load of parallel tasks and wait for them all to complete before proceeding

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace UnitTestProject2
{
    class Class4
    {
        public void run()
        {
            List<String> Arguments = new List<String> { "AA", "BB", "CC" };
            List<Task<String>> tasks = new List<Task<string>>();

            foreach (string arg in Arguments)
            {
                    tasks.Add(
                        this.DoSomething(arg)
                        .ContinueWith(t => this.DoSomething(t.Result))
                        .Unwrap<string>()
                    );
            }

            Task.WaitAll(tasks.ToArray());

            foreach(Task<string> t in tasks)
            {
                textBox1 += (t.Result + Environment.NewLine + Environment.NewLine);
            }

        }

        public async Task<string> DoSomething(string arg)
        {
            return arg;
        }

        public string textBox1;
    }
}