delegate void ShowDataCallBack(string StringData);
 int i = 0;
        public void Data(string message)
        {
            if (label1.InvokeRequired)
            {
                ShowDataCallBack callBack = new ShowDataCallBack(Data);
                label1.Invoke(callBack, new object[] { message + "   " + i.ToString() });
                i = i + 1;              
            }
            else
            {

                this.label1.Text = message + i.ToString();
            }
        }

private void Form1_Load(object sender, EventArgs e) { //開啟軟體開始接受條碼資料 Thread thread1 = new Thread(new ThreadStart(GetBarcodeInfo)); thread1.Start(); // GetJsonData(); }

public void GetBarcodeInfo()
        {
            string receiveString = null;
            byte[] receiveData = null;


            //例項化一個遠端端點，IP和埠可以隨意指定，等呼叫client.Receive(ref remotePoint)時會將該端點改成真正傳送端端點 
            IPEndPoint remotePoint = new IPEndPoint(IPAddress.Any, 0);
            int port = 11000;

            while (true)
            {
                UdpClient client = null;
                client = new UdpClient(port);
                receiveData = client.Receive(ref remotePoint);//接收資料 
                receiveString = Encoding.Default.GetString(receiveData);
                Data(receiveString);
 
                Thread.Sleep(1000);
                Data("");
                client.Close();//關閉連線 
            }
        }