C# How to check if the user entered a string or integer before storing it in the integer array

Question

I updated my program. Here's what it does.
1. User inputs limit (must be a number)
2. If integer, stored in integer. Else, ask again. (already handled with if-else)
3. User inputs value (must be a number)
4. If integer, stored in integer array. Else, ask again. (this is the problem)

Console.Write("\n  Enter limit on how many number(s): ");
string limit = Console.ReadLine();

int value;
if (int.TryParse(limit, out value))
{
    int size = int.Parse(limit);
    int[] a = new int[size];

    for (int i = 0; i < size; i++)
    {
        //I need this part to filter first the input of user
        Console.Write("  Value: ");
        //If integer, I need it to be stored in the array
        a[i] = Convert.ToInt32(Console.ReadLine());

        /*string val = Console.ReadLine();
        int detect;
        if(!int.TryParse(Console.ReadLine(), out detect))
        {
            break;
        }
        else
        {

        }*/
    }
    int len = a.Length;
    Program pj = new Program();
    pj.programBExtension(a, len);
}
else
{
    Console.Clear();
    Console.WriteLine("\n  You have entered an invalid value. You will be asked again to enter the limit.");
    goto progB;
}

Here http://stackoverflow.com/questions/24443827/reading-an-integer-from-user-Input are a lot of example. — naro, Mar 17 '16 at 14:09
Also of note, TryParse sets the 'value' variable to the parsed value already so you don't need to parse it again, just use that variable — Gordon Allocman, Mar 17 '16 at 14:10

score 1 · Answer 1 · edited Mar 18 '16 at 13:05

1

use the same tricky TryParse inside the Loop to;

for (int i = 0; i < size; i++)
{
    if(!int.TryParse(Console.ReadLine(),out a[i])
    {
        break; // This is wrong input handle this
    }
}

edited Mar 18 '16 at 13:05

Shelby115

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answered Mar 17 '16 at 14:08

sujith karivelil

28,671
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score 0 · Answer 2 · answered Mar 17 '16 at 14:13

You are already filtering out strings which cannot be converted to integers so just use that value 'detect':

        string b = Console.ReadLine();
        int detect;
        if (int.TryParse(b, out detect)) <-- Will filter out strings here

            for (int i = 0; i < size; i++)
            {
                a[i] = detect;
            }
            int len = a.Length;
            Program pj = new Program();
            pj.programBExtension(a, len);

C# How to check if the user entered a string or integer before storing it in the integer array

2 Answers2