Kristian Kristian - 18 days ago 5
C# Question

How can i read from a text file line by line and add those strings to an array?

I want to read two numbers from a text file: 2,5(Line one is 2, line 2 is 5 int my text file). I am trying to solve this for hours but each time i run the code it causes an error at this line

citaj[o] = int.Parse(h);


This is my full code for the button. I also had some error while putting it out in the richtextbox line by line.

namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
int p = 4;
int i = 0;
int b = 0;
int c = 0;
int x = 0;
TextBox[] text = new TextBox[50];
string[] linije = new string[50];
string[] brojac = new string[10];

public Form1()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
text[1] = textBox1;
text[2] = textBox2;
text[3] = textBox3;
brojac[0] = p.ToString();
brojac[1] = c.ToString();
System.IO.File.WriteAllLines(@"text\brojac.txt", brojac);
if (b == 0)
{

for (i = c; i <= p; i++)
{
if ((i == c) && (x == 0))
{
linije[i] = "---------------";
x = 1;
}

else if (i == p)
{
linije[i] = "------------------";
b = 1;
}
else
{
switch (x)
{
case 3: linije[i] ="Sifra:" + " " + text[3].Text;
x = 0;
break;
case 2: linije[i] ="Korisnicko ime:" + " " + text[2].Text;
x = 3;
break;
case 1: linije[i] ="Naziv:" + " " + text[1].Text;
x = 2;
break;
}
}

}
}
if(b == 1)
{
c = c + 5;
p = p + 5;
b = 0;
System.IO.File.WriteAllLines(@"text\Kontener.txt", linije);
}



}

private void button2_Click(object sender, EventArgs e)
{
int o = 0;
string h;
int[] citaj = new int[2];
System.IO.StreamReader sr = new System.IO.StreamReader(@"text\brojac.txt");
while ((h = sr.ReadLine()) != null)
{
string[] parts = h.Split(',');
citaj[0] = int.Parse(parts[0]);
citaj[1] = int.Parse(parts[1]);
}
richTextBox1.Lines = new string[] { citaj[0].ToString(), citaj[1].ToString() };
}
}
}

Answer

The array isnt initialized.

Try using List instead of array.

private void button2_Click(object sender, EventArgs e)
{
    List<int> citaj = new List<int>();
    string h;
    using(System.IO.StreamReader sr = new System.IO.StreamReader(@"text\brojac.txt")) 
    {
        while ((h = sr.ReadLine()) != null)
        {
            int number = 0;
            if (int.TryParse(h, out number)) 
                citaj.Add(number);
        } 
    } 
} 
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