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Convert / transform csv into txt file using .net / C#

Posted on 2010-08-15
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Last Modified: 2013-12-17
Hi All

I wish to do the following:

Loop via parent folder through all sub folders, and convert each csv file into a txt.

There are many csv to xml or txt to xml solutions, etc but I had trouble finding a solution for this.

I was thinking to convert to xml, but it is best for me to convert to txt format as it suits my needs.

thanks in advance for your help
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Question by:dataviss
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8 Comments
 
LVL 30

Expert Comment

by:IanTh
ID: 33439782
easy

do an array for the input and read the csv file in and then when finished input write out the array to a txt file
for instance  

public infile as new streamreader     'for the input
public outfile as new streamwriter    ' for output
dim input_array (x,y) as array
dim inputfile as string

If File.Exists(inputfile) Then
            Dim reader As New StreamReader(inputfile, True)
            Dim s As String = reader.ReadLine()
            reader.Close()
            If Not (s Is Nothing) AndAlso s.Length > 0 Then
                'nothing in file
            Else
                'code to write array
            End If
        Else
            Dim f As FileStream = File.Create(infile)
            f.Close()
            end If


to write it something like
for a= 1++ to arraymax
filename = String.Format("c:\ians\{0:g}log.csv", DateTime.Now.Day & DateTime.Now.Month & DateTime.Now.Year)
            outfile = New StreamWriter(filename, False)
           
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Author Comment

by:dataviss
ID: 33439811
Hi thanks for the response

I wanted to use the same fileName as per original .csv files, and it seems that this method does not loop through the parent and checks for sub folders if they exist, and process those too.

thanks
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LVL 47

Expert Comment

by:Wayne Taylor (webtubbs)
ID: 33440083
Umm, a CSV file *is* a text file. It's just a flat text file with Comma Seperated Values (hence the name).

So, seeing as it's already a text file, if you want to change the extension to "txt", use the My.Computer.FileSystem.RenameFile method...

http://msdn.microsoft.com/en-us/library/2ce15by3.aspx

Wayne
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Author Comment

by:dataviss
ID: 33440149
Apologies I will explain myself better...

I am looking to change the format from csv to tab delimited separate values (tsv) of each csv file in the current and sub folder paths

thanks
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LVL 30

Expert Comment

by:IanTh
ID: 33440734
yes you will need to strip out the commas and thats why you need an array as yyou can read it in as a csv into the array and then write it to a text file straight from the array
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Accepted Solution

by:
Mike Tomlinson earned 500 total points
ID: 33441120
Here's the basic algorithm...
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string pattern = "*.csv";
            string RootFolder = @"c:\some\path\root\folder";
            RecurseFolders(new DirectoryInfo(RootFolder), pattern);
        }

        private void RecurseFolders(DirectoryInfo di, string pattern)
        {
            foreach (FileInfo fi in di.GetFiles(pattern))
            {
                ConvertCSVtoTabDelimited(fi);
            }
            foreach (DirectoryInfo subDi in di.GetDirectories())
            {
                RecurseFolders(subDi, pattern);
            }
        }

        private void ConvertCSVtoTabDelimited(FileInfo fi)
        {
            try
            {
                System.IO.File.WriteAllText(fi.FullName, System.IO.File.ReadAllText(fi.FullName).Replace(",", "\t"));
            }
            catch (Exception ex)
            {
                MessageBox.Show("File: " + fi.FullName + Environment.NewLine + Environment.NewLine + ex.ToString(), "Error Converting File", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

    }
}

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LVL 85

Expert Comment

by:Mike Tomlinson
ID: 33441140
*If you want to create a new file in the same location, but with a .tsv extension instead of .csv, then change the ConvertCSVtoTabDelimited() method to:
        private void ConvertCSVtoTabDelimited(FileInfo fi)
        {
            try
            {
                string NewFileName = Path.Combine(Path.GetDirectoryName(fi.FullName),   Path.GetFileNameWithoutExtension(fi.FullName) + ".tsv");
                System.IO.File.WriteAllText(NewFileName, System.IO.File.ReadAllText(fi.FullName).Replace(",", "\t"));
            }
            catch (Exception ex)
            {
                MessageBox.Show("File: " + fi.FullName + Environment.NewLine + Environment.NewLine + ex.ToString(), "Error Converting File", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

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Author Closing Comment

by:dataviss
ID: 33441179
thanks for that as i addressed all my requirements
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