Updating UI using dispatcher.beginInvoke wp8

Vote count:

0

So, I am reading a message through the mobile Bluetooth and I am trying to update the UI with the data I received.

Calling another method, the 'update' method as following

        try
        {
            await update();
        }catch (Exception e)
        {
            Debug.WriteLine("Exception has been called");
            Debug.WriteLine("Type| " + e.GetType());
            Debug.WriteLine("Inner Exception| " + e.InnerException);
            Debug.WriteLine("Message| " + e.Message);
        }

and the update method goes as followes

 public async Task<String> update()
    {
        string[] sMsg = msg.Split(new Char[]{'\n'});

        string[] finalmsg = sMsg[0].Split(new Char[]{':'});

        if ((finalmsg.Length != 8 && sMsg[0] == msg) || sMsg.Length < 2)
        { // not finished reADING 
            //Debug.WriteLine("\n\n--skip as the size is : " + finalmsg.Length);
            return null;
        }

     msg = msg.Substring(sMsg[0].Length+2,msg.Length-(sMsg[0].Length+2));
     if (finalmsg.Length >= 8){

            System.Threading.Thread thread = new System.Threading.Thread(
                new System.Threading.ThreadStart(
                    delegate()
                    {
                      Dispatcher.BeginInvoke(delegate()
                        {
                            string[] fm = finalmsg;
                            RX.Text = finalmsg[0];
                            RY.Text = finalmsg[1];
                            LX.Text = finalmsg[2];
                            LY.Text = finalmsg[3];
                            RF1.Text = finalmsg[4];
                            RF2.Text = finalmsg[5];
                            LF1.Text = finalmsg[6];
                            LF2.Text = finalmsg[7];
                     });
                    }
                ));

            thread.Start();

            if(!thread.IsAlive)
                thread.Abort();
        }
        return finalmsg[0];
        }

    }

So the problem I am facing now is that, updating the UI in the body of Dispatcher.BeginInvoke works for 20 seconds and then an exception fires as following

exception has been thrown by the target of an invocation

The exception is fired in the App.xaml, Application_UnhandledException method That means the exception is not handled in the code, and I was not able to catch even with try clause.

What I am thinking now is I am doing a mistake because I don't really understand how dispatcher.beginInvoke

So could you please advice of what may went wrong here ? Thanks in advance.

asked 27 secs ago

Abdel-Rahman Shoman

53