Async output from command line app?

Question

i made an app for updating device which originally using command prompt, so, i made it in WPF UI.

i wrote this code for process launching and data received event handler, and catching errors

System.Diagnostics.Process StarterBackup_X64 = new System.Diagnostics.Process();
                                        StarterBackup_X64.StartInfo.FileName = X64;
                                        var Starter = StarterBackup_X64;
                                        Starter.StartInfo.Arguments = string.Concat("/iu \"", textBox1.Text, " " + textBox2.Text, " " + textBox3.Text, " " + textBox4.Text, " " + textBox5.Text, " " + textBox6.Text, " " + textBox7.Text, " " + textBox8.Text, " " + textBox9.Text, " " + textBox10.Text, " " + textBox11.Text, " " + textBox12.Text, " " + textBox13.Text, " " + textBox14.Text, " " + textBox15.Text, " " + textBox16.Text, " " + textBox17.Text, " " + textBox18.Text, " " + textBox19.Text, " " + textBox20.Text, "\" /enablebackup");
                                        //Starter.StartInfo.Arguments = string.Concat("/iu\"", textBox1.Text + textBox2.Text + textBox3.Text + textBox4.Text + textBox5.Text + textBox6.Text + textBox7.Text + textBox8.Text + textBox9.Text + textBox10.Text + textBox11.Text + textBox12.Text + textBox13.Text + textBox14.Text + textBox15.Text + textBox16.Text + textBox17.Text + textBox18.Text + textBox19.Text + textBox20.Text, "\" /enablebackup");
                                        StarterBackup_X64.StartInfo.CreateNoWindow = true;
                                        StarterBackup_X64.StartInfo.RedirectStandardOutput = true;
                                        StarterBackup_X64.StartInfo.UseShellExecute = false;
    StarterBackup_X64.OutputDataReceived += new       DataReceivedEventHandler(StarterBackup_X64_OutputDataReceived);
                                        StarterBackup_X64.Start();
    StarterBackup_X64.BeginOutputReadLine();
    installUpdateButton.Content = "Updating device.....";
    installUpdateButton.IsEnabled = false;
    restoreDeviceButton.IsEnabled = false;

    string UpdaterLog = outputTextBox.Text;

    if (UpdaterLog.ToString().IndexOf("no devices were found") > -1)
    {
              WPECore.ResTable.DeviceNotFound();
    }

    else if (UpdaterLog.ToString().IndexOf("error:") > -1)
    {
              WPECore.ResTable.UpdateWPCrashed();
    }

    else if (UpdaterLog.ToString().IndexOf("error message:") > -1)
    {
               WPECore.ResTable.UpdateWPCrashed();
    }

    void StarterBackup_X64_OutputDataReceived(object sender, DataReceivedEventArgs e)
    {
        outputTextBox.Dispatcher.BeginInvoke(new Action(() => { outputTextBox.Text += e.Data;  }), null);
        SplitTextIntoLines(outputTextBox.Text, 1);


    }

and, the app runs, but, the output is not in a neat form, so, i tried to write this function

        public static string[] SplitTextIntoLines(string title, int width)
    {
        System.Collections.Generic.List<System.String> list;
        System.Text.StringBuilder stringBuilder;
        string str;
        string[] arrstr1;
        int i;
        list = new System.Collections.Generic.List<System.String>();
        stringBuilder = new System.Text.StringBuilder();
        arrstr1 = title.Split(new char[] {
            ' '});
        i = 0;
        while (i < arrstr1.Length)
        {
            str = arrstr1[i];
            if (((stringBuilder.Length + str.Length) + 1) <= width)
            {
                stringBuilder.Append(' ');
                stringBuilder.Append(str);
            }
            else
            {
                list.Add(stringBuilder.ToString().Trim());
                stringBuilder = new System.Text.StringBuilder(str);
            }
            i++;
        }
        list.Add(stringBuilder.ToString().Trim());
        return list.ToArray();
    }

and, i added the SplitTextIntoLines() to event handler

but, it resulted on an InvalidOperationException: The calling thread cannot access this object because a different thread owns it.

so,. what should i do to make this app's output is neat?

Answer 1

Use following:

string outputText;
    void StarterBackup_X64_OutputDataReceived(object sender, DataReceivedEventArgs e)
    {
            outputTextBox.Dispatcher.Invoke(new Action(() => { outputTextBox.Text += e.Data; outputText = outputTextBox.Text; }), null);
            SplitTextIntoLines(outputText, 1);
    }