IndexOutOfRange exception

Question

Why is this giving a IndexOutOfRange exception?

string[] achCheckStr = File.ReadAllLines("achievements.txt");

if (achCheckStr[0] == ach1_StillBurning) // this is where the exception occurs
{
    setAchievements(1);
}
if (achCheckStr[1] == ach2_Faster)
{
    setAchievements(2);
}

Answer 1

Problem 1:

there mightbe no file exists with name achievements.txt. this statement string[] achCheckStr = File.ReadAllLines("achievements.txt"); might be returning null.

Solution 1: so before accessing any files please check whether file exists or not by using File.Exists() method.

Problem 2: there might be no lines in your text file.

Solution 2: before accessing the string array which contains lines please make sure that it is not empty by checking its Length

Try This:

if(File.Exists("achievements.txt"))
{
    string[] achCheckStr = File.ReadAllLines("achievements.txt");
    if(achCheckStr.Length > 0)
    {
        if (achCheckStr[0] == ach1_StillBurning) 
        {
            setAchievements(1);
        }
        if (achCheckStr[1] == ach2_Faster)
        {
            setAchievements(2);
        }
    }
}