如何从文本文件中读取特定行和文本

Question

string lot = "RU644276G01";

var year = "201" + lot.Substring(2, 1);
var folder = @"\\sinsdn38.ap.infineon.com\ArchView\03_Reports\" + year +
             @"\" + lot.Substring(3, 2) + @"\" + lot.Substring(0,8) + @"\";

DirectoryInfo di = new DirectoryInfo(folder);

foreach (var fi in di.GetFiles("*.TLT"))
{
    var file = fi.FullName;
    string line;
    using (StreamReader sr = new StreamReader(file))
    {
        while ((line = sr.ReadLine()) != null)
        {
            if (line.StartsWith("TEST-END"))
            {
                timeStampTextBox.Text = line;
            }
        }
    }

This is my code currently.

I want to read from a specific line (for example line 8) and the line starts with "Test-End" . However, line 8 contains all these

"TEST-END : 2017-01-08 15:51 PROGRAM : TLE8888QK-B2 BAU-NR : 95187193"

but I only want to read "2017-01-98 15:51" .

How do I change my code to get that? Currently I'm getting the whole line instead of the specific timestamp that I want.

Edit How do I change the code such that the string lot =" " can be any number, meaning it does not need to be RU644276G01, it can be a different number which will be typed by users. I have created a textbox for users to input the number.

Answer 1

You extract the text. It seems quite regular pattern, so regular expressions should be able to help:

using System;
using System.Text.RegularExpressions;

public class Program
{
    public static void Main()
    {
        var line = "TEST-END : 2017-01-08 15:51 PROGRAM : TLE8888QK-B2 BAU-NR : 95187193";

        Regex re = new Regex(@"^(?:TEST-END : )(.*?\d{4}-\d{2}-\d{2} \d{2}:\d{2})");

        var match = re.Match(line);

        Console.WriteLine(match.Groups[1]);         

        Console.ReadLine(); // leave console open
    }
}

Output:

2017-01-08 15:51   // this is group 1, group 0 is the full capture including TEST-END : 

Use this to check it in regexr: https://regexr.com/3l1sf if you hover about the text it will diplay your capturing groups

The regex means:

^                                    start of the string
 (?:TEST-END : )                     non capturing group, text must be present
 (                                   a group
   .*?                               as few (0-n) anythings as possible
   \d{4}-\d{2}-\d{2} \d{2}:\d{2}     4 digits-2 digits-2digits 2digits:2digits
 )                                   end of group

More about regular expressions:

• RegEx-Class

• a regex Tester (one of many, the one I use): https://regexr.com/

Answer 2

you can split the line with ":", like this

 var value = line.split(':');

and get your date like this.

 var date = value[1] + ":" + value[2].Replace("PROGRAM", "");

above statement means

date = "2017-01-98 15" + ":" + "51"

                if (line.StartsWith("TEST-END"))
                {
                    var value = line.split(':');
                    var date = value[1] + ":" + value[2].Replace("PROGRAM", "");
                    timeStampTextBox.Text = date;
                }

This is not the best answer, it depends on exactly the statement you had given.

Answer 3

Here is my answer using Regular Expressions.

if (line.StartsWith("TEST-END"))
{
    Regex re = new Regex(@"\d{4}-\d{2}-\d{2} \d{2}:\d{2}");
    var match = re.Match(line);

    if(m.Success)
    {
        timeStampTextBox.Text = match.Value;
    }
}

Output: 2017-01-08 15:51

Answer 4

I finally got all three parameters out of the last line

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;

namespace ConsoleApplication1
{
    class Program
    {

        static void Main(string[] args)
        {
            Dictionary<string, string> dict = new Dictionary<string, string>();

            string pattern = @"(?'name'[^\s]+)\s:\s(?'value'[\w\s\-]*|\d{4}-\d{2}-\d{2}\s\d{2}:\d{2})";
            string line = "TEST-END : 2017-01-08 15:51 PROGRAM : TLE8888QK-B2 BAU-NR : 95187193";

            MatchCollection matches = Regex.Matches(line, pattern, RegexOptions.RightToLeft);

            foreach (Match match in matches)
            {
                Console.WriteLine("name : '{0}', value : '{1}'", match.Groups["name"].Value, match.Groups["value"].Value);
                dict.Add(match.Groups["name"].Value, match.Groups["value"].Value);
            }

            DateTime date = DateTime.Parse(dict["TEST-END"]);
            Console.ReadLine();

        }
    }
}