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reading text into arrays

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Christine (VIP)

I am working in C# visual studio. Right now I have managed to read in a text
file to an arraylist and write it to the console screen. What I would like
to do is convert this to a one dimensional array and write it to a new file.
My code is as below. The first chunk of it works, but when I try to create
the array, it writes System.String [] in the console.
Thanks

using System;
using System.IO;
using System.Collections;

namespace ReadWriteArrayCSharp
{

class Class1
    {


    static void Main(string[] args)
        {
    //opens streamreader to read in test1 file
StreamReader objReader = new StreamReader("c:\\ChristineWork\\test1.txt");
    string sLine="";
//reads file in as an arraylist
    ArrayList arrText = new ArrayList();

//read until end of file
    while (sLine != null)
    {
    sLine = objReader.ReadLine();
    if (sLine != null)
//add each line of text file in
    arrText.Add(sLine);
    }
    objReader.Close();

    foreach (string sOutput in arrText)
//write to console
    Console.WriteLine(sOutput);
    Console.ReadLine();
    StreamWriter sw= new StreamWriter("c:\\ChristineWork\\testtest.txt");
// Create and initialize 1-D target array
    Array final=Array.CreateInstance(typeof(string),96 );

//Copies entire arraylist to target array
    arrText.CopyTo(final);
    Console.Write(final);
    sw.Write(final);
        }

    }
}

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Dan

Christine,

1. The ArrayList structure is already 1 dimensional...

2. to write an ArrayList or string[] to file do the following:

StreamWriter wtr = File.CreateText ( "myfilename.txt" );
wtr.AutoFlush = true; // good practice if you've lots of data
foreach ( string szLine in myArray )
{
wtr.WriteLine ( szLine );
}
wtr.Close();

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Christine (VIP)

Ok that works, except that I would like to get it into 1 column of 96 rows.
My data i am working with are decimal numbers separated by spaces. How might
I go about this? Thank you so much for your help.

"Dan" wrote:

[Original message clipped]

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Nicholas Paldino [.NET/C# MVP] (VIP)

Christine,

You might want to try using the Split method on the string class. It
will allow you to split a string up, delimiting it by whatever character
that you want. You can then get the parts in an array of strings, and print
them out however you wish.

Hope this helps.

--
- Nicholas Paldino [.NET/C# MVP]
- Click here to reveal e-mail address

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Bob Grommes

// al is the ArrayList with the loaded file

foreach (string sOutput in al) {
// bool arg will supress empty values in case there are any
// values separated by more than one space.
string[] sFields = sOutput.Split(new char[] {' '},true);

foreach (string sField in sFields) {
// Write to the file.
}

}

This will give you 96 records from each of the original records.

String.Split(char[],bool) will be obsoleted in CLR 2.0 by
String.Split(char[],StringSplitOptions). The old overload will be left in
there for backward compatibility. CLR 2.0 won't offer any new functionality
(the StringSplitOptions enum only has members "None" and
"RemoveEmptyEntries") -- so I guess they did this for clarity and possibly,
to provide for additional options in the future.

--Bob

"Christine" <Click here to reveal e-mail address> wrote in message
news:Click here to reveal e-mail address...
> Ok that works, except that I would like to get it into 1 column of 96
rows.
> My data i am working with are decimal numbers separated by spaces. How
might
[Original message clipped]

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Christine (VIP)

Bob,
I don't know if i interpreted your answer correctly and used it in my code
correctly. So it is posted below. I am getting an error that it cant access
the file to write to because it is being used by another process. Thanks!

using System;
using System.IO;
using System.Collections;

namespace ReadWriteArrayCSharp
{

    class Class1
    {


    static void Main(string[] args)
        {
//opens streamreader to read in test1 file
    StreamReader objReader = new StreamReader("c:\\ChristineWork\\test1.txt");
    string sLine="";
//reads file in as an arraylist
    ArrayList arrText = new ArrayList();

//read until end of file
    while (sLine != null)
            {
    sLine = objReader.ReadLine();
    if (sLine != null)
//add each line of text file in
    arrText.Add(sLine);
            }
    objReader.Close();

    foreach (string sOutput in arrText)
//write to console
    Console.WriteLine(sOutput);
    Console.ReadLine();

    foreach (string sOutput in arrText)
        {
// bool arg will supress empty values in case there are any
// values separated by more than one space.
    string[] sFields = sOutput.Split(new char[] {' '});

    foreach (string sField in sFields)
        {
// Write to the file.
StreamWriter sw= new StreamWriter("c:\\ChristineWork\\test11.txt");
    sw.WriteLine(sField);
    Console.WriteLine(sField);

                }
    Console.WriteLine();
            }
}
}
}

"Bob Grommes" wrote:

[Original message clipped]

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Jon Skeet [C# MVP] (VIP)

Christine <Click here to reveal e-mail address> wrote:
[Original message clipped]

Well, do you have another program using test11.txt? Try changing it to
a completely new filename and see if that helps.

--
Jon Skeet - <Click here to reveal e-mail address>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

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Christine (VIP)

I'm sorry, I meant to include that. I have tried four or five different file
names and they have all given the same error.

"Jon Skeet [C# MVP]" wrote:

[Original message clipped]

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Christine (VIP)

Again, I apologize, it was a simple mistake, (closing the streamwriter) and
I corrected it. Thank you!!

"Christine" wrote:

[Original message clipped]

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	System.Array
	System.Collections.ArrayList
	System.Console
	System.IO.File
	System.IO.StreamReader
	System.IO.StreamWriter
	System.String

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