C# - Seriel: Hexwert über 127 auslesen

void sp_DataReceived(object sender, SerialDataReceivedEventArgs e)

{

 string bffr = ConvertToHex(serialPort.ReadExisting());

 this.BeginInvoke(new SetTextDeleg(si_DataReceived), new object[] { bffr });

}

public string ConvertToHex(string asciiString)

{

 string hex = "";

 foreach (char c in asciiString)

 {

  int tmp = c;

  hex += String.Format("{0:x2}", (uint)System.Convert.ToUInt32(tmp.ToString()));

 }

 return hex;

}

        List<byte> bBuffer = new List<byte>();

        void sp_DataReceived(object sender, SerialDataReceivedEventArgs e)

        {

            while (serialPort.BytesToRead > 0)

                bBuffer.Add((byte)serialPort.ReadByte());

        }

using System;

using System.Windows.Forms;

using System.IO.Ports;

namespace SerialPortWinForms

{

  public partial class Form1 : Form

  {

    SerialPort myport;

    delegate void UpdateCallback(string s);

    public Form1()

    {

      InitializeComponent();

      myport = new SerialPort("com1", 9600);

      myport.DataReceived += OnDataReceived;

      myport.Open();

    }

    void OnDataReceived(object sender, SerialDataReceivedEventArgs e)

    {

      SerialPort sp = (SerialPort) sender;  

      textBox1.Invoke(new UpdateCallback(this.UpdateTheTextbox), sp.ReadExisting());

    }

    void UpdateTheTextbox(string s)

    {

      foreach (char c in s)

      {

        textBox1.Text += c.ToString();

        textBox2.Text += String.Format("{0:X02} ", (byte) c);

      }

    } 

  }

}