Use of unassigned local variable (Very simple function with a string array). C# language

Question

I looked previous questions but it didn't help. I have a very simple function written in c#. It give me compiler error "Use of unassigned local variable 'linea' " (line (2)). What could be wrong? And could tell me how to correct it please?

    public void llenarTabla()
    {

        int idx;
        string[] linea; (1)
        for (idx = 0; idx < numListas; idx++)
        {
            linea[0] = Convert.ToString(idx); // (2)
            switch(OrdenListas[idx]){
                case 0: linea[1] = "Crescente"; break;
                case 1: linea[1] = "Decrescente"; break;
                case 2: linea[1] = "Aleatorio"; break;
                default: linea[1] = "No especificado" ; break;
            }
            linea[2] = Convert.ToString(LongitudListas[idx]);
        }
    }

I already saw the reference "Compiler error if a variable is used but it might be not initialized. But as far I see the variable string[] (indexes:0,1,2) is inizialized in every case except numlistas = 0 (numlistas is a class parameter and its value is supposed to be >=1).

I also tried to change line (1) and (2) to:

(1) List<string> linea;

(2) linea.Add(Convert.ToString(idx));

but same error (when I tried to change line (1) and (2) I put as a comment all the following lines.

Thank you in advance for every help

Would you mind marking one of the answers as accepted?

Gert Arnold
– Gert Arnold

2012-03-04 15:50:42 +00:00
Commented Mar 4, 2012 at 15:50 — Gert Arnold
– Gert Arnold, Commented Mar 4, 2012 at 15:50

gideon · Accepted Answer · 2012-02-19 15:44:10Z

2

Just do:

string[] linea = new string[3];//3 is the length of your array
//you can store 3 elements in linea [0] [1] and [2]

See MSDN reference for arrays in C#

answered Feb 19, 2012 at 15:44

gideon

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Comments

driis · Accepted Answer · 2012-02-19 15:45:13Z

2

You have declared a variable of type string[] (array of string), but you have not assigned it a value. In other words, the linea variable is not yet initialized when you use it.

Your line (1) needs to look like:

string [] linea = new string[numListas];

answered Feb 19, 2012 at 15:45

driis

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JaredPar · Accepted Answer · 2012-02-19 15:46:59Z

1

The problem is you declared the variable string[] linea but you never initialized it to a specific value before using it within the body of the for loop. Based on the usage within the loop you want it to have 3 elements so the following will work

string[] linea = new string[3];

answered Feb 19, 2012 at 15:46

JaredPar

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Andrei G · Accepted Answer · 2012-02-19 15:48:08Z

1

Change to this:

  public void llenarTabla()
    {

        int idx;
        List<string> linea=new List<string>();
        for (idx = 0; idx < numListas; idx++)
        {
            linea.Add(Convert.ToString(idx)); // (2)
            switch(OrdenListas[idx]){
                case 0: linea.Add("Crescente"); break;
                case 1:linea.Add("Decrescente"); break;
                case 2: linea.Add("Aleatorio"); break;
                default:linea.Add("No especificado" ); break;
            }
           linea.Add(Convert.ToString(LongitudListas[idx]));
        }
    }

answered Feb 19, 2012 at 15:48

Andrei G

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