Question

i receives this table from my process output into List<string>:

List<string> list = new List<string>();
StreamReader reader = tsharkProcess.StandardOutput;

            while (!reader.EndOfStream)
            {
                string read = reader.ReadLine();
                list.Add(read);
            }

what would be the best way to parse this table to show only the ip address, the value and the parentage ?

Answer 1

This will read the ipAddress, value and percentage on the fly if the rows are tab-delimited

using(StreamReader reader = tsharkProcess.StandardOutput)
{
   while (!reader.EndOfStream)
   {
       string[] values = reader.ReadLine().Split('\t');
       if (values.Length == 4)
       {
           string ipAddress = values[0];
           string value = values[1];
           string percentage = values[3];
           ...
       }
   }
}

If not then it could be done using RegEx.

using(StreamReader reader = tsharkProcess.StandardOutput)
{
   while (!reader.EndOfStream)
   {
       string row = reader.ReadLine();
       string[] values = Regex.Split(row, @"\s+", RegexOptions.None);
       if (values.Length == 4)
       {
           string ipAddress = values[0];
           string value = values[1];
           string percentage = values[3];
           ...
       }
   }
}

And the hard core RegEx solution.

public class MyClass
{
    // Lots of code....

    private static Regex regexRowExtract = new Regex(@"^\s*(?<ip>\d+\.\d+\.\d+\.\d+)\s*(?<value>\d+)\s+(?<rate>\d+\.?\d*)\s+(?<percentage>\d+\.?\d*)%\s*$", RegexOptions.Compiled);

    public void ReadSharkData()
    {
        using(StreamReader reader = tsharkProcess.StandardOutput)
        {
            while (!reader.EndOfStream)
            {
                string row = reader.ReadLine();
                Match match = regexRowExtract.Match(row);
                if (match.Success)
                {
                    string ipAddress = match.Groups["ip"].Value;
                    string value = match.Groups["value"].Value;
                    string percentage = match.Groups["percentage"].Value;

                    // Processing the extracted data ...
                }
            }
        }
    }
}

For the Regex solution you should use:

using System.Text.RegularExpressions;