CODEWITHSUNDEEP
c#substring
FyXs_Xeno
FyXs_Xeno

Reputation: 63

How to extract single string from file line

I know this is probably a newbie question but I need help with my first C# program. I need to extract some strings from a file. Every line looks like this:

630    FWTRGS782BT a-p     66.12.111.198

and need to only retrieve (it is a serial number):

FWTRGS782BT

I was thinking the correct way could to use line.Substring() but I really don't know how to retrieve it.

Actually every serial number starts by FG or FW, so it could may be possible to extract whenever I get a match with those first two letters and get up till the end of the string (or /t)?

Upvotes: 0

Views: 246

Answers (3)

Adrian Efford
Adrian Efford

Reputation: 483

Here an example of how to read all serial numbers from a file 

    private List<string> GetAllSerialNumbersFromDocument(string pathToFile) //something like "C://folder/folder/file.txt"
    {
        List<string> serialNumbers = new List<string>(); //list where all serial numbers are stored

        using (System.IO.StreamReader file = new StreamReader(pathToFile)) //Use 'using' because TextReader implements IDisposable
        {
            string line;
            while ((line = file.ReadLine()) != null) //read all lines
            {
                serialNumbers.Add(GetSerialNumber(line)); //Get serial number of line and save it into list
            }               
        }

        return serialNumbers; //return all serial numbers
    }
    private string GetSerialNumber(string line)
    {
        var singleElements = line.Split(new char[] {' '}, StringSplitOptions.RemoveEmptyEntries); //split elements
        return singleElements.First(x => x.StartsWith("FW") || x.StartsWith("FG")); //Get serial number
    }

Upvotes: 2

Amit Verma
Amit Verma

Reputation: 2490

Try this:

string line = "630    FWTRGS782BT a-p     66.12.111.198";

            var lineArr = line.Split(new char[] {' '}, StringSplitOptions.RemoveEmptyEntries);

            var requiredText = lineArr.Where(x => !string.IsNullOrEmpty(x) && x.StartsWith("FW") || x.StartsWith("FG"));

Upvotes: 2

David
David

Reputation: 16277

  var input = "630    FWTRGS782BT a-p     66.12.111.198";
  var output = input.Split( new char []{ ' ' }, 
               StringSplitOptions.RemoveEmptyEntries);                                       
  Console.WriteLine(output[1]);  //➙ FWTRGS782BT

Upvotes: 1

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