c# – 同时运行任务.NET 4.5

public static async void AwakeTest()
{
    var Do1 = Sleep(1,1);
    var Do2 = Sleep(1,2);
    var Do3 = Sleep(1,3);

    await System.Threading.Tasks.Task.WhenAll(Do1,Do2,Do3); 

    Console.WriteLine(await Do1);
    Console.WriteLine(await Do2);
    Console.WriteLine(await Do3);
}

private static async System.Threading.Tasks.Task<int> Sleep(int Seconds,int ID)
{
    if (Seconds < 0)
    {
        throw new Exception();
    }
    System.Threading.Thread.Sleep(Seconds * 1000);
    return ID;
}