Question

I’ve got a JS array which is writing to a text file on the server using StreamWriter. This is the line that does it:

sw.WriteLine(Request.Form["seatsArray"]);

At the moment one line is being written out with the entire contents of the array on it. I want a new line to be written after every 5 commas. Example array:

BN,ST,A1,303,601,BN,ST,A2,303,621,BN,WC,A3,303,641,

Should output:

BN,ST,A1,303,601,
BN,ST,A2,303,621,
BN,WC,A3,303,641,

I know I could use a string replace but I only know how to make this output a new line after every comma, and not after a specified amount of commas.

How can I get this to happen?

Thanks!

Answer 1

Well, here’s the simplest answer I can think of:

string[] bits = Request.Form["seatsArray"].Split(',');

for (int i = 0; i < bits.Length; i++)
{
    sw.Write(bits[i]);
    sw.Write(",");
    if (i % 5 == 4)
    {
        sw.WriteLine();
    }
}

It’s not terribly elegant, but it’ll get the job done, I believe.

You may want this afterwards to finish off the current line, if necessary:

if (bits[i].Length % 5 != 0)
{
    sw.WriteLine();
}

I’m sure there are cleverer ways… but this is simple.

One question: are the values always three characters long? Because if so, you’re basically just breaking the string up every 20 characters…