c search string in txt file

Question

I want to find a string in a txt file if string compares  it should go on reading lines till another string which I m using as parameter  Example  CustomerEN   search for this string     some text which has details about the customer id  quot 123456 quot  username  quot rootuser quot      CustomerCh   get text till this string  I need the details to work with them otherwise  I m using linq to search for  quot CustomerEN quot  like this  File ReadLines pathToTextFile  Any line   gt  line Contains  quot CustomerEN quot     But now I m stuck with reading lines  data  till  quot CustomerCh quot  to extract details

User · Answer

With LINQ  you could use the SkipWhile   TakeWhile methods  like this   var importantLines        File ReadLines pathToTextFile       SkipWhile line   gt   line Contains  CustomerEN         TakeWhile line   gt   line Contains  CustomerCh

User · Answer

I worked a little bit the method that Rawling posted here to find more than one line in the same file until the end  This is what worked for me                   foreach  var line in File ReadLines pathToFile                                         if  line Contains  CustomerEN    amp  amp  current    null                                                current   new List lt string gt                             current Add line                                             else if  line Contains  CustomerEN    amp  amp  current    null                                                current Add line                                                           string s   String Join      current                   MessageBox Show s

User · Answer

If your pair of lines will only appear once in your file  you could use  File ReadLines pathToTextFile       SkipWhile line   gt   line Contains  CustomerEN         Skip 1     optional      TakeWhile line   gt   line Contains  CustomerCh       If you could have multiple occurrences in one file  you re probably better off using a regular foreach loop - reading lines  keeping track of whether you re currently inside or outside a customer etc   List lt List lt string gt  gt  groups   new List lt List lt string gt  gt     List lt string gt  current   null  foreach  var line in File ReadAllLines pathToFile         if  line Contains  CustomerEN    amp  amp  current    null          current   new List lt string gt         else if  line Contains  CustomerCh    amp  amp  current    null                groups Add current           current   null            if  current    null          current Add line

User · Answer

You have to use while since foreach does not know about index  Below is an example code   int counter   0  string line   Console Write  Input your search text      var text   Console ReadLine     System IO StreamReader file       new System IO StreamReader  SampleInput1 txt     while   line   file ReadLine       null        if  line Contains text                 break             counter       Console WriteLine  Line number   0    counter    file Close     Console ReadLine

User · Answer

If you whant only one first string  you can use simple for-loop   var lines   File ReadAllLines pathToTextFile    var firstFound   false  for int index   0  index  lt  lines Count  index         if  firstFound  amp  amp  lines index  Contains  CustomerEN               firstFound   true          if firstFound  amp  amp  lines index  Contains  CustomerCh                 do  what you want  and exit the loop          return lines index

[c#] c# search string in txt file

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