Task.Run（）代码是否异步执行？

Question

I have defined this block code. Can anyone tell me if this code is asynchronous or parallel ? This block code just only an example. It creates four threads and in the end waits for all the threads to be complete.

public Form1()
    {
        InitializeComponent();

        var t1 = Task.Run(() =>
        {
            GetSum();
        });

        var t2 = Task.Run(() =>
        {
            GetSum();
        });

        var t3 = Task.Run(() =>
        {
            GetSum();
        });

        var t4 = Task.Run(() =>
        {
            GetSum();
        });

        Task.WaitAll(t1, t2, t3, t4);
    }

    private int GetSum()
    {
        int sum = 0;

        for (int i = 0; i < int.MaxValue; i++)
        {
            sum += i;
        }

        return sum;
    }

Answer 1

First of all, a Task doesn't directly create a thread. A Task handles threads via the ThreadPool mechanism. It is Asynchronous. This is because the static method Task.Run() returns a work queued to execute in the ThreadPool to it's caller.