Read data from a file and Write a set of X lines for Y times until end of data

Question

I'm trying to read data from a file and write a set of x lines for y times until the end of the data file. For example:

This is my data file:
line 1
line 2
line 3
line 4
line 5
line 6
line 7
line 8
line 9
line 10
line 11
line 12
...

I want to read in line 1-9 and write this to a file 27 times, then read line 9-18 and write this to the same file for 27 times. My finished file should look something like:
line 1
line 2
line 3
line 4
line 5
line 6
line 7
line 8
line 9
...x27 times
line 10
...
line 18
...x27 times

My current code will write the first 9 lines for 27 times, but I'm not quite sure how to go about reading from 10-18 again. Please help! Any hint or suggestion is appreciated.

Attachment: program.zip

Vulpes · Answer

If I've understood it correctly then this should do it: using System; using System.IO; using System.Collections.Generic; using System.Linq; using System.Text; namespace ConsoleApplication2 { class Program { static void Main(string[] args) { int counter = 0; string line; StreamReader sr = new StreamReader(testfile.csv); StreamWriter sw = new StreamWriter(newtestfile.csv); string[] temp = new string[9]; while(true) // infinite loop { // read next batch of 9 or whatever's left in file while (counter { temp[counter] = line; counter++; } // write 27 times to file for (int x = 0; x { for (int i = 0; i { sw.WriteLine(temp[i]); } } if (counter Array.Clear(temp 0 9); // clear array for next batch of 9 counter = 0; // clear counter } sr.Close(); sw.Close(); } } }

C NewBee · Answer

You are awesome! Thank you!

Vulpes · Answer

If you insert the highlighted lines then that should generate the necessary empty lines: while(true) // infinite loop { // read next batch of 9 or whatever's left in file while (counter { temp[counter] = line; counter++; } // write 27 times to file for (int x = 0; x { for (int i = 0; i { sw.WriteLine(temp[i]); } if (counter { for (int i = counter; i { sw.WriteLine(); } } } if (counter Array.Clear(temp 0 9); // clear array for next batch of 9 counter = 0; // clear counter } sr.Close(); sw.Close(); }

C NewBee · Answer

This works great and that is exactly what I tried to describe. However when the original file does not contain 9 18 27 36 or divisible by 9 items it only print out whatever left 27 times. What I want it to do is to print out 9 lines of 27 times at all time. Therefore when there is only 4 items left it should still print out 4 items + 5 empty lines all 27 times. Sorry if I didn't explain myself very well.