C#中async和await用法

    class Class1
    {
        private async void DoSomething()
        {
            await Do();
        }

        private Task Do()
        {
            return Task.Run(() => { Thread.Sleep(5000); });
        }

        [STAThread]
        static void Main(string[] args)
        {
            Class1 c = new Class1();
            c.DoSomething();
        }
    }