unity进行串口通信，编辑界面可以运行，但是在打包成exe时失败

问题遇到的现象和发生背景

本人咋制作串口通信相关的unity项目，目前可以在unity编辑界面正常运行，但是在打包时就会报错

问题相关代码

串口通信代码来自：https://www.cnblogs.com/fws94/p/12296523.html

using UnityEngine;
using System.Collections;
using System.IO.Ports;
using System;
using System.Collections.Generic;
using System.Threading;
using System.Text;

public class PortManager2 : MonoBehaviour
{
    #region 定义串口属性
    //public GUIText Test;
    //定义基本信息
    [Header("BasicSettings")]
    public string portName = "COM4";//串口名
    public string dataReceive;
    public int baudRate = 115200;//波特率
    public Parity parity = Parity.None;//效验位
    public int dataBits = 8;//数据位
    public StopBits stopBits = StopBits.One;//停止位

    SerialPort sp = null;
    Thread dataReceiveThread;
    //发送的消息
    //string message = "";
    public List<byte> listReceive = new List<byte>();
    char[] strchar = new char[256];//接收的字符信息转换为字符数组信息
    string str;
    #endregion
    void Start()
    {
        OpenPort();
        dataReceiveThread = new Thread(new ThreadStart(DataReceiveFunction));
        dataReceiveThread.Start();
    }
    void Update()
    {

    }

    #region 创建串口，并打开串口
    public void OpenPort()
    {
        //创建串口
        sp = new SerialPort(portName, baudRate, parity, dataBits, stopBits);
        sp.ReadTimeout = 500;
        sp.WriteTimeout = 500;

        sp.ReadBufferSize = 1024 * 1024;
        sp.WriteBufferSize = 1024 * 1024;

        try
        {
            sp.Open();
            sp.DiscardInBuffer();
            sp.DiscardOutBuffer();
        }
        catch (Exception ex)
        {
            Debug.Log(ex.Message);
        }
    }
    #endregion



    #region 程序退出时关闭串口
    void OnApplicationQuit()
    {
        ClosePort();
    }
    public void ClosePort()
    {
        try
        {
            sp.Close();
            dataReceiveThread.Abort();
        }
        catch (Exception ex)
        {
            Debug.Log(ex.Message);
        }
    }
    #endregion


    /// <summary>
    /// 打印接收的信息
    /// </summary>
    void PrintData()
    {
        for (int i = 0; i < listReceive.Count; i++)
        {
            strchar[i] = (char)(listReceive[i]);
            str = new string(strchar);
        }
        Debug.Log(str);
    }

    #region 接收数据
    void DataReceiveFunction()
    {
        #region 按单个字节发送处理信息，不能接收中文
        //while (sp != null && sp.IsOpen)
        //{
        //    Thread.Sleep(1);
        //    try
        //    {
        //        byte addr = Convert.ToByte(sp.ReadByte());
        //        sp.DiscardInBuffer();
        //        listReceive.Add(addr);
        //        PrintData();
        //    }
        //    catch
        //    {
        //        //listReceive.Clear();
        //    }
        //}
        #endregion


        #region 按字节数组发送处理信息，信息缺失
        byte[] buffer = new byte[1024];
        int bytes = 0;
        while (true)
        {
            if (sp != null && sp.IsOpen)
            {
                try
                {
                    bytes = sp.Read(buffer, 0, buffer.Length);//接收字节
                    if (bytes == 0)
                    {
                        continue;
                    }
                    else
                    {
                        dataReceive = Encoding.Default.GetString(buffer,0,16);
                        Debug.Log(dataReceive);                        
                    }
                }
                catch (Exception ex)
                {
                    if (ex.GetType() != typeof(ThreadAbortException))
                    {
                    }
                }
            }
            Thread.Sleep(3000);//原来是10
        }
        #endregion
    }
    #endregion



   /* #region 发送数据
    public void WriteData(string dataStr)
    {
        if (sp.IsOpen)
        {
            sp.Write(dataStr);
        }
    }
    void OnGUI()
    {
        message = GUILayout.TextField(message);
        if (GUILayout.Button("Send Input"))
        {
            WriteData(message);
        }
        string test = "AA BB 01 12345 01AB 0@ab 发送";//测试字符串
        if (GUILayout.Button("Send Test"))
        {
            WriteData(test);
        }
    }
    #endregion*/
}

运行结果及报错内容