Export datatable to csv using csvhelper

Question

4.00/5 (1 vote)

See more:

I'm trying to use the library csvhelper to export an existing datatable (not a dataset) called CHAIN to a csv file. It looks like I need to create a new datatable and load CHAIN into it, rather than just iterate over CHAIN, but I'm not sure how to do this. Please take a look at the code below and let me know what's wrong?

What I have tried:

C#

public void EXPORT_CSV()
        {
            using (var textWriter = File.CreateText(@"D:\Temp\NewCsv.csv"))
            using (var csv = new CsvWriter(textWriter))
            using (var DT = new DataTable())
            {
                //dt.Load(CHAIN); not sure how to do this

                // Write columns
                foreach (DataColumn column in DT.Columns)       //copy datatable CHAIN to DT, or just use CHAIN
                {
                    csv.WriteField(column.ColumnName);
                }
                csv.NextRecord();

                // Write row values
                foreach (DataRow row in DT.Rows)
                {
                    for (var i = 0; i < DT.Columns.Count; i++)
                    {
                        csv.WriteField(row[i]);
                    }
                    csv.NextRecord();
                }
            }
        }

Posted 7-Jun-16 19:08pm

Trader999

Updated 14-Feb-20 15:12pm

v2

Add a Solution

Comments

Richard MacCutchan 8-Jun-16 3:25am

let me know what's wrong?
You have not explained what the problem is.

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)

Richard Deeming · Answer 1 · 2016-06-08T04:28:00

Based on your code, it looks like you just need to remove the using (var DT = new DataTable()) line, and replace each reference to DT with CHAIN:

C#

public void EXPORT_CSV()
{
    using (var textWriter = File.CreateText(@"D:\Temp\NewCsv.csv"))
    using (var csv = new CsvWriter(textWriter))
    {
        // Write columns
        foreach (DataColumn column in CHAIN.Columns)
        {
            csv.WriteField(column.ColumnName);
        }
        csv.NextRecord();
 
        // Write row values
        foreach (DataRow row in CHAIN.Rows)
        {
            for (var i = 0; i < CHAIN.Columns.Count; i++)
            {
                csv.WriteField(row[i]);
            }
            csv.NextRecord();
        }
    }
}

Narshe · Answer 2 · 2016-06-08T04:20:00

Solution 1

This is in the documentation. CsvHelper[^]

Posted 8-Jun-16 4:20am

Narshe