show last 50 lines of log file on web page

Question

I have developed an asp.net c# webpage to allow user to download or view server logs. Once the server and log date is selected they have the option to either open it via Notepad++, or view part of the log in a textbox. Part of the requirement is to show only the last 50 lines of the log in the textbox, this in the only part I'm not sure of can anyone point me in the right direction?

Just now I'm building up the path then setting the text property of the textbox as follows:

                    _PathFrom = @"\\" + ddlServer.SelectedItem.Value + @"\Logs\" + AppOrSession.SelectedItem.Value + @"\" + ddlKernel.SelectedItem.Value + @"\" + txtLogName.Text;
                WebClient MyClient = new WebClient();
                _Log = MyClient.DownloadString(_PathFrom);
                txtLog.Text = _Log;

thanks

What is the problem? Reading a file? finding the last 50 lines? — Eser, Aug 20 '15 at 08:59
It would be better if you start your code and if you get stuck, come back here. — B.K., Aug 20 '15 at 08:59
Maybe this will help: http://stackoverflow.com/a/452945/261050 — Maarten, Aug 20 '15 at 09:17
Thanks Maarten, looks like what I need, that or some array reverse type of thing — DarkW1nter, Aug 20 '15 at 09:29

score -1 · Answer 1 · answered Aug 20 '15 at 09:08

using this method pick last 50 lines from file and display to front end    

public static IList<string> GetLog(string logname, string numrows)
    {
        int lineCnt = 1;
        List<string> lines = new List<string>();
        int maxLines;

        if (!int.TryParse(numrows, out maxLines))
        {
            maxLines = 50;
        }

        string logFile = HttpContext.Current.Server.MapPath("~/" + logname);

        BackwardReader br = new BackwardReader(logFile);
        while (!br.SOF)
        {
            string line = br.Readline();
            lines.Add(line + System.Environment.NewLine);
            if (lineCnt == maxLines) break;
            lineCnt++;
        }
        lines.Reverse();
        return lines;
    }

show last 50 lines of log file on web page

1 Answers1