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

Answer 1

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#