Append Text File on specific line number

Question

0.00/5 (No votes)

See more:

Hi to all,

I am checking a notepad file which contains almost 5000 lines of records.
I have to insert 10 rows of records after each 500 lines in the same file.
After doing the job I will have a file which will contain total 5100 lines of records.

Original File
--------------
00001
00002
.
.
00500 <-- New 10 rows after this record
.
.
09999
10000
--------------

I am using System.IO namespace for reading purpose.

Tools:

Framework = 2.0
Language = VB.NET
.
Please Advice.
Thanks In Advance.

Posted 4-Jan-12 1:27am

Harshad-HBK

Updated 4-Jan-12 1:35am

Mehdi Gholam

v2

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

CPallini · Accepted Answer · 2012-01-04T01:37:00

Solution 1

There's no 'insertion' functionality for files: you have to create a new file with the appropriate content:
Read line by line from input file (you may use the StreamReader.ReadLine Method[^]) and output the read line to the ouput file, until line count reaches 500.
Then write the '10 rows' to the output file and, finally, resume reading line by line the input file (and write every line to the output file) until the end-of-(input)file.

Posted 4-Jan-12 1:37am

CPallini

Comments

Wendelius 4-Jan-12 17:51pm

That'll be a good way. 5. I added a bit brute-force solution...

Harshad-HBK 6-Jan-12 0:26am

Thanks CPallini..I got ma solution

CPallini 7-Jan-12 15:55pm

You are welcome.

Wendelius · Accepted Answer · 2012-01-04T11:50:00

Solution 2

One quite brute-force way is to read all the lines to an array or a list, add necessary items and then write the contents to the file. For example something like:

C#

List<string> lines = System.IO.File.ReadAllLines("...").ToList<string>();
lines.Insert(500, "some string");
lines.Insert(501, "other string");
...
System.IO.File.WriteAllLines("...",lines);

Posted 4-Jan-12 11:50am

Wendelius

Comments

CPallini 4-Jan-12 18:19pm

My 5.

Wendelius 4-Jan-12 18:41pm

Thanks :)

Harshad-HBK 6-Jan-12 0:27am

Thanks Mika, job done successfully...

Wendelius 6-Jan-12 6:10am

You're welcome :)