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Using a BackgroundWorker Object from a Winform

/ Published in: C#
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I didn't like the way ReportProgress events backed up, so I ran a Timer object to update the progress meter instead.

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  1. int totalLines = 0;
  2.         int goodLines = 0;
  3.         int badLines = 0;
  4.         int colNum = 0; 
  5.         long bytesProcessed = 0;
  6.         long fileSize = 0;
  7.         string regEx = string.Empty;
  8.         char[] delimiter = null; 
  9.         StringBuilder sb = new StringBuilder();
  10.         StreamReader sr = null; 
  11.  
  12.         private void txtParse_Click(object sender, EventArgs e)
  13.         {
  14.             totalLines = 0;
  15.             goodLines = 0;
  16.             badLines = 0;
  17.             sb = new StringBuilder();
  18.  
  19.             bytesProcessed = 0;
  20.             progressBar1.Value = 0;
  21.             FileInfo fi = new FileInfo(txtInputFile.Text);
  22.             fileSize = fi.Length;
  23.  
  24.             sr = new StreamReader(txtInputFile.Text);
  25.             colNum = Convert.ToInt32(txtColNum.Text);
  26.             regEx = txtRegex.Text;
  27.             delimiter = txtDelimiter.Text.ToCharArray();
  28.  
  29.             timer1.Start(); 
  30.             backgroundWorker1.RunWorkerAsync(); 
  31.         }
  32.  
  33.         private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
  34.         {
  35.             while(!sr.EndOfStream)
  36.             {
  37.                 string rawLine = sr.ReadLine();
  38.                 totalLines++;
  39.                 bytesProcessed += rawLine.Length;
  40.                 string[] splitLine = rawLine.Split(delimiter);
  41.                 if (Regex.IsMatch(splitLine[colNum], regEx))
  42.                 {
  43.                     goodLines++;
  44.                 }
  45.                 else
  46.                 {
  47.                     badLines++;
  48.                     sb.AppendLine(rawLine);
  49.                 }
  50.             }
  51.         }
  52.  
  53.         private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
  54.         {
  55.             txtOutput.Text = "Lines Processed: " + totalLines.ToString() + "
  56. ";
  57.             txtOutput.Text += "Good Lines: " + goodLines.ToString() + "
  58. ";
  59.             txtOutput.Text += "Bad Lines: " + badLines.ToString() + "
  60. ";
  61.             txtOutput.Text += sb.ToString();
  62.             timer1.Stop();
  63.             progressBar1.Value = 100; 
  64.         }
  65.  
  66.         private void timer1_Tick(object sender, EventArgs e)
  67.         {
  68.             double ratio = Convert.ToDouble(bytesProcessed) / Convert.ToDouble(fileSize);
  69.             double rawPercent = ratio * 100;
  70.             int send = Convert.ToInt32(rawPercent);
  71.             progressBar1.Value = send; 
  72.         }

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