?
Solved

Remove the first (Empty) column from a CSV file using C#

Posted on 2008-09-29
6
Medium Priority
?
2,413 Views
Last Modified: 2013-12-17
Hello Experts,

I am receiving a CSV file from a third party. The file aways comes with the first Column of cells with no data. This is due to a comment at  location A1 on the spreadsheet. Data starts at B2.

I would like to remove this column so that the data in the files starts at A2 instead of B2 using C#

Does anyone know how to do this??

Thanks!
 
0
Comment
Question by:Saxitalis
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 3
6 Comments
 
LVL 55

Expert Comment

by:Jaime Olivares
ID: 22601587
try with something like this:


using(TextReader reader = new StreamReader("yourfile.csv"))
{
     using(TextWriter writer = new StreamWriter("yourfile.csv.tmp")) 
     {
            do {
                 string line = reader.ReadLine();
                 if (line != null)
                        writer.WriteLine(line.Substring(1));
           } while (line != null);
      }
}
 
File.Delete("yourfile.csv");
File.Move('yourfile.csv.tmp", "yourfile.csv");

Open in new window

0
 

Author Comment

by:Saxitalis
ID: 22605097
Hi Jamie,

I tried your code but I can't seem to get it to work...

I moved the line declaration above the begining of the do loop due to scope:

 using(TextWriter writer = new StreamWriter("yourfile.csv.tmp"))
 {

***
  string line = reader.ReadLine();
***
 do {
            if (line != null)
             writer.WriteLine(line.Substring(1));
           } while (line != null);
}

When I run this code, the temp file grows out of hand. It looks like. The blank column is removed but it looks like an entire row of cells is saved back into each cell and repeated many times. The temp file does not stop growing until I break the process.

Any ideas what may be going on here?

Thanks!
0
 
LVL 55

Expert Comment

by:Jaime Olivares
ID: 22606284
sorry, I am writing from my memory, it should be:

string line;
using(TextReader reader = new StreamReader("yourfile.csv"))
{
     using(TextWriter writer = new StreamWriter("yourfile.csv.tmp"))
     {
            do {
                 line = reader.ReadLine();
                 if (line != null)
                        writer.WriteLine(line.Substring(1));
           } while (line != null);
      }
}
 
File.Delete("yourfile.csv");
File.Move('yourfile.csv.tmp", "yourfile.csv");
0
Stack Overflow Podcast - Developer Story

Welcome to the Stack Overflow podcast recorded Thursday July 20 at Stack Overflow Headquearters in NYC. Your hosts today are podcast regulars Jay Hanlon, David Fullerton, and Ilana Yitzhaki, plus the quite irregular Matt Sherman (Stack Overflow Engineering Manager extraordinaire)

 

Author Comment

by:Saxitalis
ID: 22609967
Thanks Jaime -  ths is pretty close to what I am after. I want to delete the entire column even if there is text in one of the cells (sorry if I was not clear on that)

See attached Excel CSV example screenshots:
Sheet1 is how it looks after Vendor sends it to me
Sheet2 is how I want it to look
Sheet3 is how it looks after running your code.

I would like to remove the text "Note from Vendor here" as well as effectively moving all the data to the left one row. This would be the same as highlighting the entire A column (on Sheet1) and selecting delete from the context menu when in Excell spreadsheet view.

Any Ideas?

Thanks!


RemoveColumnFromCSV.doc
0
 
LVL 55

Accepted Solution

by:
Jaime Olivares earned 1500 total points
ID: 22610089
Which is your csv separator?
Assuming it is semi-colon, you should use:

string line;
char separator = ';';
using(TextReader reader = new StreamReader("yourfile.csv"))
{
     using(TextWriter writer = new StreamWriter("yourfile.csv.tmp"))
     {
            do {
                 line = reader.ReadLine();
                 if (line != null)
                        writer.WriteLine(line.Substring(line.IndexOf(separator)+1));
           } while (line != null);
      }
}
 
File.Delete("yourfile.csv");
File.Move('yourfile.csv.tmp", "yourfile.csv");
0
 

Author Closing Comment

by:Saxitalis
ID: 31501402
Thanks Jaime!
0

Featured Post

What is SQL Server and how does it work?

The purpose of this paper is to provide you background on SQL Server. It’s your self-study guide for learning fundamentals. It includes both the history of SQL and its technical basics. Concepts and definitions will form the solid foundation of your future DBA expertise.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

IP addresses can be stored in a database in any of several ways.  These ways may vary based on the volume of the data.  I was dealing with quite a large amount of data for user authentication purpose, and needed a way to minimize the storage.   …
This article describes relatively difficult and non-obvious issues that are likely to arise when creating COM class in Visual Studio and deploying it by professional MSI-authoring tools. It is assumed that the reader is already familiar with the cla…
In this video, Percona Solution Engineer Dimitri Vanoverbeke discusses why you want to use at least three nodes in a database cluster. To discuss how Percona Consulting can help with your design and architecture needs for your database and infras…
In this video, Percona Solutions Engineer Barrett Chambers discusses some of the basic syntax differences between MySQL and MongoDB. To learn more check out our webinar on MongoDB administration for MySQL DBA: https://www.percona.com/resources/we…
Suggested Courses

770 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question