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Lorelei Symphony
Asked: 2021-10-31 13:48:10 +0800 CST 2021-10-31 13:48:10 +0800 CST

How to convert string[] to int? C#

  • 772

Hello people! I am making a graph (with chart) that takes information from a text file for the X,Y axes. my problem is when searching in a text file, numbers.

the structure of my txt file is as follows:

int n_survey;string city;int age;string gender;

ex: 1;Buenos Aires;25;Female

 2;Corrientes;19;Masculino

 3;...

I use Split(';') to skip my separator in that string and my goal is to capture the age of all the records, line by line in the txt file. I have this:

  StreamReader stream = File.OpenText(@"C:\Usuarios\...");
  List<int> list_edad = new List<int>();
  string[] arreglo_cad;
  string cad = stream.ReadLine();

  while(cad != null)
  {
     arreglo_cad = cad.Split(';');
     list_edad.Add(Convert.ToInt32(arreglo_cad[2]));
     // ...[2] porque es la posicion de las edades
     cad = stream.ReadLine();
  }

  foreach(var item in list_edad)
  {
     if(item >= 16 && item <= 30)
        ++cont1;
     else
        ++cont2;
  }

but the list is not saving the values, any solution?

c#

2 Answers

  1. Best Answer

    Try to File.ReadAllLines()return all the lines as an array of string:

    var lineas = Files.ReadAllLines("c/usuarios/...");

var ints = new List<int>();
foreach(var c in lineas)
{
    int edad = int.Parse(c.Split(';')[2]);
    ints.Add(edad);
}

    Here done with Linq:

    var edades = Files.ReadAllLines(@"c:/usuarios/..")
.Select(x=> x.Split(';')[2])
.Select(int.Parse)
.ToList();
    • 1

  2. Most likely you are reading the file wrong This is the correct way to read a txt file in c#

    static void Main(string[] args)
    {
        string[] lines = System.IO.File.ReadAllLines(@"C:\ruta\archivo.txt");
        System.Console.WriteLine("Contenido del archivo = ");
        foreach (string line in lines)
        {
            // Use a tab to indent each line of the file.
            Console.WriteLine("\t" + line);
        }
        Console.WriteLine("Presione cualquier tecla para salir.");
        System.Console.ReadKey();
    }
    • 0