C#serialPort实现串口通信

Question

我想实现的是上位机发送数据，然后接收数据，然后上位机处理数据，再继续发送数据一直循环到结束。
目前的问题就是，我通过以下代码实现的是在循环调用测试函数，循环运行完了以后,才开始读取数据

 public Form1()
        {
            InitializeComponent();
            serialPort1.DataReceived += serialPort1_DataReceived;
        }

                 private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {

            this.Invoke(new EventHandler(Read));

        }

        private void Read(object s, EventArgs e)
        {
                    int n = serialPort1.BytesToRead;
            byte[] buf = new byte[n];
            serialPort1.Read(buf, 0, n);
                        data_catched=true;
                }
                public bool test_CA()
        {//测试CA

            //定义附加信息
            Byte[] test_CA_add = new Byte[1] { 0x00 };
            //发送命令帧
            Write(test_cmd_CA, test_CA_add);//发送数据函数测试无误，并在发送完后立刻有数据返回

            byte test_CA_data;

            //时延等待接收数据
            for (int i = 0; !data_catched && i < 300; i++)
            {
                Thread.Sleep(10);
            }

            if (!data_catched)
            {
                        //处理数据
                        }
                        data_catched=false;
            }

Answer 1

for (int i = 0; !data_catched && i < 300; i++)
{
Thread.Sleep(10);
Application.DoEvents();
}