How can I remove the oldest lines in a file when using a FileStream and StreamWriter?

Question

Based on Prakash\'s answer here, I thought I\'d try something like this to remove the oldest lines in a file prior to adding a new line to it:

private ExceptionL         


        

Answer 1

ReadAllLines and WriteAllLines are just hiding a loop from you. Just do:

StreamReader reader = new StreamReader(_fileStream);
List logList = new List();

while (!reader.EndOfStream)
   logList.Add(reader.ReadLine());

Note that this is nearly identical to the implementation of File.ReadAllLines (from MSDN Reference Source)

       String line;
        List lines = new List();

        using (StreamReader sr = new StreamReader(path, encoding))
            while ((line = sr.ReadLine()) != null)
                lines.Add(line);

        return lines.ToArray();

WriteAllLines is simialr:

StreamWriter writer = new StreamWriter(path, false); //Don't append!
foreach (String line in logList)
{
   writer.WriteLine(line);
}