如何在asp.net MVC（串口通讯）中显示从控制器查看的数据

Question

I am trying to build a login system using Arduino and RFID reader in asp.net MVC c#.

My objective is to update my view from the controller every time the client taps his RFID tag to RFID reader. Whenever the client taps his RFID tag to RFID reader, I want to update the view to display the information of the client.

For now, I am able to read the tag ID from Arduino using the code below but I don't have an idea on how to display my data to view. I did searching for this problem in google but I didn't get the answer for asp.net.

Controller

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO.Ports;
using System.Linq;
using System.Threading;
using System.Web;
using System.Web.Mvc;

namespace read_rfid_example.Controllers
{
    public class HomeController : Controller
    {
        // GET: Home
        public ActionResult Index()
        {

            SerialPort mySerialPort = new SerialPort("COM3");

            mySerialPort.BaudRate = 9600;
            mySerialPort.Parity = Parity.None;
            mySerialPort.StopBits = StopBits.One;
            mySerialPort.DataBits = 8;
            mySerialPort.Handshake = Handshake.None;
            mySerialPort.RtsEnable = true;

            mySerialPort.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);

            if(!mySerialPort.IsOpen)
                 mySerialPort.Open();


            return View();
        }

        private static void DataReceivedHandler(
                         object sender,
                         SerialDataReceivedEventArgs e)
        {
            SerialPort sp = (SerialPort)sender;
            string indata = sp.ReadExisting();
            Console.WriteLine("Data Received:");
            Console.Write(indata);

            Debug.WriteLine(indata); //  TAG ID: 03 0e 03 06 (output example and want to pass this data to view)
        }
      }
    }

Simple View

@{
    ViewBag.Title = "Index";
}

<h3>@ViewBag.TagId</h3>

My problem and my question are how can I update my tag in view every time the RFID reader detects the RFID tag? I need help with this problem. Someone can give me a proper way to make this like real-time?

Answer 1

if you want see some maybe could be like

private static void DataReceivedHandler(
                     object sender,
                     SerialDataReceivedEventArgs e)
    {
        SerialPort sp = (SerialPort)sender;
        string indata = sp.ReadExisting();
        Console.WriteLine("Data Received:");
        Console.Write(indata);
        Session["RfidCurrent"] = indata;
        Debug.WriteLine(indata); //  TAG ID: 03 0e 03 06 (output example and want to pass this data to view)
    }


    [HttpGet] 
    public ActionResult Index()
    {
        ViewBag.TagId = Session["RfidCurrent"]
        return View();
    }