C# Async/await

 public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();

            DisplayValue();

        }

     public async void DisplayValue()
        {

           double res = await GetValueAsync(232.3, 1.005);//在这个地方会开心的线程处理GetValueAsync函数 之后立马返回

           //这之后的代码都会被封装成委托在 GetValueAsync执行之后执行

             MessageBox.Show(res.ToString());
        }
        public Task<double> GetValueAsync(double n1, double n2)
        {
            return Task.Run(() =>
            {
                for (int i = 0; i < 1000000; i++)
                {
                    n1 = n1 / n2;
                }
                return n1;
            });
        }

}

上述的代码的原理是

System.Runtime.CompilerServices.TaskAwaiter<double> awiter = GetValueAsync(232.3, 1.005).GetAwaiter();
            awiter.OnCompleted(() =>
            {
                double s = awiter.GetResult();
                MessageBox.Show(s.ToString());
            });

其实其目的是用关键字 Async和await 简化了代码看起来更加的简介可读。

总结通过上述的原理我封装了一个异步执行带回调函数的