StreamWriter add an extra \r in the end of the line

Question

I created a class with the responsibility to generate a text file where each line represents the information of an object of \'MyDataClass\' class. Below is a simplification

Answer 1

I just now had a similar problem where the code below would randomly insert blank lines in the output file (outFile)

using (StreamWriter outFile = new StreamWriter(outFilePath, true)) {
     foreach (string line in File.ReadLines(logPath)) {
            string concatLine = parse(line, out bool shouldWrite);
            if (shouldWrite) {
              outFile.WriteLine(concatLine);       
            }     
      }   
}

Using Antar's idea I changed my parse function so that it returned a line with Environment.NewLine appended, ie

return myStringBuilder.Append(Environment.NewLine).ToString();

and then in the foreach loop above, changed the

outFile.WriteLine(concatLine);

to

outFile.Write(concatLine);

and now it writes the file without a bunch of random new lines inserted. However, I still have absolutely no idea why I should have to do this.