File.ReadAllLines(FileName) array size limit

Question

0.00/5 (No votes)

See more:

If I use:

C#

string FileName = "MyFile.txt";
string[] DataFile = File.ReadAllLines(FileName);

Now say the file has 5 lines...
Therefore the DataFile array will have its last file line on 4.

If I want to add a line at say DataFile[5] (which is at the bottom of the array and past the end of file position), I get an OutOfRangeException which is understandable. What is the best way to do what I want to do? essentially I want the array to be resized.

Posted 2-Feb-12 3:19am

Winston_D

Add a Solution

3 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)

LanFanNinja · Accepted Answer · 2012-02-02T03:39:00

Solution 3

As GanesanSenthilvel said use a List<string> instead or the Array.Resize() method.

Here are some examples:

C#

List<string> dataFile = new List<string>();
dataFile.AddRange(File.ReadAllLines(FileName));

then you could add another files lines in the same way

C#

dataFile.AddRange(File.ReadAllLines(SomeOtherFile));

or

C#

string[] data = new string[] { "blah", "blah blah", "blah blah blah" };
dataFile.AddRange(data);

or a single line

C#

dataFile.Add("some line of data");

or

C#

string someData = "blah blah blah blah";
dataFile.Add(someData);

You could if you really wanted to use the Array.Resize() method i.e.

C#

string[] data = new string[2];
data[0] = "some data";
data[1] = "some more data";
Array.Resize(ref data, data.Length + 1);
data[2] = "even more data";

Posted 2-Feb-12 3:39am

LanFanNinja

Updated 2-Feb-12 4:08am

v4

Comments

Winston_D 2-Feb-12 9:46am

Thanx a million!

LanFanNinja 2-Feb-12 9:50am

You're welcome.

Note also that if you use a List<string> you could always convert it to an array for 'insert reason here' if you needed to. i.e.
List<string> data = new List<string>();
string[] dataArray = data.ToArray();

LanFanNinja 2-Feb-12 10:12am

Sorry there was an error in my code. =0
I modified my solution with the change below.

from
Array.Resize(ref data, data.Size + 1);
to
Array.Resize(ref data, data.Length + 1);

sorry if there was any problems because of this.

Good day.

Winston_D 2-Feb-12 11:18am

No problems. I caught on. thanx for the help

Sergey Alexandrovich Kryukov 2-Feb-12 20:57pm

Of course. My 5.
--SA

LanFanNinja 3-Feb-12 1:53am

Thank you

Rajesh Anuhya · Accepted Answer · 2012-02-02T03:31:00

Solution 2

Your Target is add line to the existing file at end
why don't you use this code

StreamWriter sw= File.AppendText("c:\\temp.txt");
            sw.WriteLine();
            sw.WriteLine("hello");
            sw.Flush();
            sw.Close();

Thanks
--RA

Posted 2-Feb-12 3:31am

Rajesh Anuhya

Comments

Winston_D 2-Feb-12 11:17am

Thanks for the answer. I did not want to use the stream tools for doing this. wanted to try a different approach with some benefits that the stream tool doesnt have.

Ganesan Senthilvel · Accepted Answer · 2012-02-02T03:26:00

Solution 1

Instead of array of String, you can very well use

C#

List<string></string>

to avoid OutOfRangeException

Posted 2-Feb-12 3:26am

Ganesan Senthilvel

Comments

Winston_D 2-Feb-12 11:16am

i am not very familiar with lists but thank. will do some research on it