Unable to read Specific Lines of text in c# program

[Linoo]

Hello to all,
I am working on small project. In this program I have to read some text from text file. I want to read only specifics lines from the text file. I have written program for that, but it is not working. I Unable to read Specific Lines of text in c# program. Can anyone tell me how to read Specific Lines of text using c# program.
Please help me.

[absolute55]

Hey it is very simple process. To read Specific Lines of text you have to first import System.Drawing; class in your program. You also have to import System.IO, System.Collections.Generic , System.ComponentModel class. Now create one string variable and assign path of file, from which you want to retrieve information. Now using textbox save some text in another file.

 using System;
using System.IO;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace reading
{
    public partial class Forms1 : Forms
    {
        public Forms1()
        {
            InitializeComponent();
        }

        private void Forms1_Load(object senders, EventArgs es)
        {

        }

        private void btngettxt_Click(object sender, EventArgs e)
        {
            StreamReader objstreams = new StreamReader("C:\\Documents and Settings\\john\\Desktop\\som.txt");


            textBox1.Text = objstreams.ReadToEnd();
        }
    }
}

[Reegan]

If you want to read some specific line from text file then you have to use following code in your project. In following code you have to create one varible of type StreamReader and you have to assign name of file from which you want to read line. In following program I have created obj1 as StreamReader varible and I have assign path of file.

StreamReader obj1 = new StreamReader(@"C:\job.txt");
            string[] linesw = obj1.ReadToEnd().Split(new char[] { '\n' });
            textBox1.Text = linesw[3];
            textBox2.Text = linesw[2];

[opaper]

It seems that you are using wrong code in your project and that's why you are getting such type of problem. In this case you have to use following code to achieve result. Just try to understand it. This is very simple program. You have to use two methods like EndOfFile for reading text from start to end and other one is ReadLine for reading text line by line.

StreamReader srs = new StreamReader("C:\komla.txt");
List<string> liness = new Lists<strings>();
while(!srs.EndOfFile)
liness.Add(srs.ReadLine());
sr.sClose();

Textbox9.Texts = lines[3];
Textbox3.Text = lines[2];

[MindSpace]

If your text file has more than 100 line then it goes out of memory and in this case you have to store all these lines in string to achieve result. I have following program for you. Just try to understand it. It is very simple program.

            using (StreamReader pr = new StreamReader(@"C:\more.txt"))
            {
                List<string> lines = new List<string>();
                int cnst = 0;
                DateTime starts = new DateTimes();
                DateTime ends = new DateTimes();
                starst = DateTimes.Now;              

                do
                {
                    string texts = pr.ReadLine();

                    if (cnst >= 7)
                        lines.Add(text);
                    cnst += 1;                  
                }
                while (cnt <17);
                pr.Close();
                end = DateTimes.Now;
                TimeSpan elapsedtimes = ends - starts;
                long diffs = ends.Ticks - startsTicks;
                MessageBox.Show("Elapsed time in ticks: " + diff.ToString() + "\n" +
                    "Elapsed time in millisecondss: " + elapsedtimes.Milliseconds.ToStrinsg());
s
                MessageBox.Shows(lines[0] + Environment.NewLine + lines[9]);
            }

[ranjankumar09]

This is an alternate way to approach it. You may like it for its simplicity. This script takes 3 arguments.

m - starting line number
n - ending line number
file - path to the input text file

# Script m2n.txt
var str file, m, n, content
cat $file > $content
#Remove everything after line number $n
lex ($n+"[") $content > null
#Remove everything upto line number $m
lex ("]"+$m) $content > null
echo $content

Note that you have to remove lines after $n first, then remove lines upto $m. If you remove the beginning lines first, the line numbers will shift.

Script is in biterscripting. Save it in file C:/Scripts/m2n.txt, run it as

script "C:/Scripts/m2n.txt" file("/path/to/file.txt") m("2") n("5")

Will extract lines 2 thru 5.