C# async await 异步例子

 public const string  Linefeed= " ";
        private void BtnasyncAwait_Click(object sender, RoutedEventArgs e)
        {
            SetTextShow("111 balabala. My Thread ID is :" + Thread.CurrentThread.ManagedThreadId);
             AsyncMethod();
            SetTextShow("222 balabala. My Thread ID is :" + Thread.CurrentThread.ManagedThreadId);

        }

 

        private void SetTextShow(string textContent)
        {
            txtInfo.Dispatcher.Invoke(new Action(()=> { txtInfo.Text += DateTime.Now.ToString() + " " + textContent + Linefeed; }));
           
        }

        private void ClearTextShow()
        {
            txtInfo.Dispatcher.Invoke(new Action(() => { txtInfo.Text = string.Empty; }));

          
        }

  private async Task AsyncMethod()
        {
            var ResultFromTimeConsumingMethod = TimeConsumingMethod();
            string Result = await ResultFromTimeConsumingMethod + " + AsyncMethod. My Thread ID is :" + Thread.CurrentThread.ManagedThreadId;
            SetTextShow(Result);
            //返回值是Task的函数可以不用return
        }

 

        //这个函数就是一个耗时函数，可能是IO操作，也可能是cpu密集型工作。
        private Task<string> TimeConsumingMethod()
        {
            var task = Task.Run(() => {
                SetTextShow("Helo I am TimeConsumingMethod. My Thread ID is :" + Thread.CurrentThread.ManagedThreadId);
                Thread.Sleep(5000);
                SetTextShow("Helo I am TimeConsumingMethod after Sleep(5000). My Thread ID is :" + Thread.CurrentThread.ManagedThreadId);
                return "Hello I am TimeConsumingMethod";
            });

            return task;
        }