c# - How do i filter and remove lines that don't contain the specifc word/s? -

this method now:

private void wordsfilter(list<string> newtext) {     (int = 0; < newtext.count; i++)     {         (int x = 0; x < wordslist.words.length; x++)         {             linetopost = scrolllabel._lines[i];             if (!linetopost.contains(wordslist.words[x]))             {                 newtext.remove(linetopost);             }         }     } } 

newtext list , worldslist.words string[]

i loop on lines in newtext , loop on words , want check way:

first line in newtext loop on words if none of of words exist in line remove current line , next line after it. example in newtext if line in index 0 : hello , line in index 1 is: created @ 12/3/2002 remove index 0 , index 1

index 2 empty space empty line not remove it.

then index 3 loop on words if nonoe of words exist in line in index 3 remove index 3 , index 4 .

and on...

how can ?

here working example. try didnt change logic of code :

using system; using system.collections.generic;  public class program {     public static void main()     {         list<string> list = new list<string>() {"truc", "i love toto", "next", "chocolate", "tata tata", "", "something"};         wordsfilter(list);     }      private static void wordsfilter(list<string> newtext)     {         string[] wordslist = new string[] { "toto", "tata" };          (int = 0; < newtext.count; i++)         {             (int x = 0; x < wordslist.length; x++)             {                 if (newtext[i].contains(wordslist[x]))                 {                     newtext.removeat(i);                     if (i + 1 < newtext.count)                         newtext.removeat(i);                 }             }         }          // print         foreach(var item in newtext)         {             console.writeline(item);         }     } } 

you should check how works foreach loop , linq.