Question

I have an app that reads a huge text file (about more than 100MB) line by line.

As it takes so much time for the app to read the file, I’d like to add a StatusStripProgressBar at its bottom, indicating how much time remains until the end of loading.

I tried to compare the file length to the length of the strings being read, but I don’t get the same result. I also tried to convert the string to bytes, but it still differs, for example:

while (!sr.EndOfStream) 
{
   s = sr.ReadLine;
   TotalStringSize += s.Length;
   UTF8ToASCII += UTF8Encoding.ASCII.GetByteCount(s);
   UTF8ToBigEndianUnicode += UTF8Encoding.BigEndianUnicode.GetByteCount(s);
   UTF8ToDefault += UTF8Encoding.Default.GetByteCount(s);
   UTF8ToUnicode += UTF8Encoding.Unicode.GetByteCount(s);
   UTF8ToUTF32 += UTF8Encoding.UTF32.GetByteCount(s);
   UTF8ToUTF7 += UTF8Encoding.UTF7.GetByteCount(s);
   UTF7ToASCII  = UTF7Encoding.ASCII.GetByteCount(s);
   //
   // ...
   //
}

The results I get are either higher or lower than the result given by System.IO.FileStream.Length.
Any idea?

EDIT: The framework used is .NET 2.0

Answer 1

The sr.ReadLine strips from the returned string the carriage return/line feed couple of chars.
You need to keep count for these characters missing in the returned string but present in the overall file lenght.