Index out of range in wp7

I m trying to retrieve all the data in the isolated s开发者_如何学运维torage file. But i get a index out of range error. home^how^yo^

StreamReader readFile = new StreamReader(new IsolatedStorageFileStream("AlarmFolder\\alarm.txt", FileMode.Open, myStore));

string[] alarmDetailsSeparated;

String fileText = readFile.ReadLine();


//alarmDetailsSeparated is the array that hold the retrieved alarm details from alarm.txt and is split by '^'
alarmDetailsSeparated = fileText.Split(new char[] { '^' });

foreach (string home in alarmDetailsSeparated)
{
    for (i = 0; i < alarmDetailsSeparated.Length;)
    {
        if (test > 0)
        {
            i = test;
        }

        dateSeparate = alarmDetailsSeparated[i];
        timeSeparate = alarmDetailsSeparated[i + 1];
        labelSeparate = alarmDetailsSeparated[i + 2];

        date = dateSeparate;
        time = timeSeparate;
        label = labelSeparate;

        test = test + 3 ;
        break;
    }

    MessageBox.Show("i is " + alarmDetailsSeparated[i]);
    MessageBox.Show("i + 1 is " + alarmDetailsSeparated[i + 1]);
    MessageBox.Show("i + 2 is " + alarmDetailsSeparated[i + 2]);
}

---

In the loop, you are going from 0 to the length of alarmDetailsSeparated. This is fine, but you are then indexing alarmDetailsSeparated using i+1 and i+2.

This means that when the loop is at alarmDetailsSeparated.Length-2 the program will index alarmDetailsSeparated.Length-2+2 = alarmDetailsSeparated.Length and throw an out of bounds error.

---

dateSeparate = alarmDetailsSeparated[i];
timeSeparate = alarmDetailsSeparated[i + 1];
labelSeparate = alarmDetailsSeparated[i + 2];

The last 2 lines are the problematic ones: if you are looping from 0 to alarmDetailsSeperated length, there is no guarantee that the current index + 1, or +2 exists, thus making this code not safe (as you see, you are getting an exception).

An easy solution would be to modify your loop:

for (i = 0; i < alarmDetailsSeparated.Length - 2;)

---

Ok, IIUC your storage file looks something like this:

home^date^time^label
home^date^time^label
...

and you want to do processing on each alarm data entry in the file.

The first thing you need to do is split it on each line:

string[] lines = file.ReadAllLines("alarms.dat");
foreach (line in lines) {
    // handle the alarm data entry (see below)
}

Now you can do the split as you are doing in your code:

string[] data = line.Split(new char[] { '^' });

This should give you 4 entries if the line has the data you want, so check for this:

if (data.Length == 4) { // looks like an alarm data entry
    // do processing on the alarm data entry (see below)
}

the data can now be extracted:

string home = data[0];
string date = data[1];
string time = date[2];
string label = date[3];

And then acted on:

MessageBox.Show(String.Format("home {0} at {1} on date {2} with label {3}",
                home, time, date, label));