Array of string management

Question

I have an array of string, I want to take all the string in an interval of this array until string does not contains something.

Something like:

string [] arrayReading = {
  "e","x","a","takefromhere",
  "keeptaking","keeptaking","dont'ttakefromhere","m","p","l","e"
};

I have tried:

        List<string> result = null;

        for (int i = 0; i < arrayReading.Length; i++)
        {
            if (arrayReading[i].Contains("takefromhere"))
            {
                result.Add(arrayReading[i]);

                if (!arrayReading[i + 1].Contains("dont'ttakefromhere"))
                {
                    result.Add(arrayReading[i + 1]);

                    if (!arrayReading[i + 2].Contains("dont'ttakefromhere"))
                    {
                        rescription.Add(arrayReading[i + 1]);
                    }
                }
            }
        }

Seems working but it's not really dynamic as I want it, because maybe I need to take 20 values between "takefromhere" and "don'ttakefromhere".

So you will always have a start value right, what about and end value, will there always be one or not? If there's no end value, just take them all or otherwise in between them correct? — Trevor
– Trevor, Commented Feb 27, 2020 at 14:05
List<string> result = arrayReading.SkipWhile(item => item != startItem).TakeWhile(item => item != stopItem).ToList(); and you'll have {"takefromhere", "keeptaking", "keeptaking"} — Dmitrii Bychenko
– Dmitrii Bychenko, Commented Feb 27, 2020 at 14:05
LINQ's SkipWhile and TakeWhile allow you to almost translate your specification literally. — Jeroen Mostert
– Jeroen Mostert, Commented Feb 27, 2020 at 14:05

Dmitrii Bychenko · Accepted Answer · 2020-02-27 14:16:40Z

2

When querying you can try Linq:

 using System.Linq;

 ...

 List<string> result = arrayReading
   .SkipWhile(item => item != "takefromhere") 
   .TakeWhile(item => item != "dont'ttakefromhere")
   .ToList();

Or if you want good old loop solution:

 List<string> result = new List<string>(); 

 bool taking = false;

 foreach (string item in arrayReading) {
   if (!taking) 
     taking = item == "takefromhere";

   if (taking) {
     if (item == "dont'ttakefromhere")
       break;

     result.Add(item);
   } 
}

Let's have a look:

Console.Write(string.Join("; ", result));

Outcome:

takefromhere; keeptaking; keeptaking

edited Feb 27, 2020 at 14:16

answered Feb 27, 2020 at 14:12

Dmitrii Bychenko

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3 Comments

Rob None Over a year ago

Thanks a lot, didn't know this property SkipWhile/TakeWhile!

Trevor Over a year ago

@RobNone they are not properties... Also this answer could address what the OP is doing wrong in their code above so user understands what is wrong and anyone else that may come across the same issue, but this deviates from that by providing a different solution.

Jeroen Mostert Over a year ago

@Çöđěxěŕ: or we could have a new answer that addresses what the OP is doing wrong, and you could even be the one to write that. :-)

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