Solved

C#  loop through data table rows - skips first row

Posted on 2013-06-30
5
2,150 Views
Last Modified: 2013-07-05
I am creating a datatable to write from an Excel spreadsheet to a csv file.

The code skips the first data row, the column headers. The column headers do not get written to the csv.  Sample spreadsheet attached.

The code:
---------------------------
convertExcelToCSV(@"c:\keys\book2.xls", "Sheet1", @"c:\keys\target.csv")

---------------------------
static void convertExcelToCSV(string sourceFile, string worksheetName, string targetFile)
        {
            string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + sourceFile + ";Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=1\"";

            OleDbConnection conn = null;
            StreamWriter wrtr = null;
            OleDbCommand cmd = null;
            OleDbDataAdapter da = null;
           
            try
            {
                conn = new OleDbConnection(strConn);
                conn.Open();
                cmd = new OleDbCommand("SELECT * FROM [" + worksheetName + "$]", conn);
                cmd.CommandType = CommandType.Text;
                wrtr = new StreamWriter(targetFile);
                da = new OleDbDataAdapter(cmd);
                DataTable dt = new DataTable();
                da.Fill(dt);

                for (int x = 0; x < dt.Rows.Count; x++)
                {
                    string st = dt.Rows[x].ToString();
                    for (int y = 0; y < dt.Columns.Count; y++)
                    {
                        if (y > 0)
                        {
                            rowString += ",";
                        }
                        {
                            rowString += "\"" + dt.Rows[x][y].ToString() + "\"";
                           
                        }
                    }
                    wrtr.WriteLine(rowString);
                }
                MessageBox.Show("Done! Your " + sourceFile + " has been converted into " + targetFile + ".");
            }
            catch (Exception exc)
            {
                MessageBox.Show(exc.ToString());
            }

            finally
            {
                if (conn.State == ConnectionState.Open)
                    conn.Close();
                    conn.Dispose();
                    cmd.Dispose();
                    da.Dispose();
                    wrtr.Close();

                wrtr.Dispose();

            }

        }
Book2.xls
0
Comment
Question by:Delta7428
  • 3
  • 2
5 Comments
 
LVL 29

Accepted Solution

by:
anarki_jimbel earned 500 total points
ID: 39288569
This piece of code prints column names:

            DataTable dt = new DataTable();
            Type typeInt32 = Type.GetType("System.Int32");
            Type typeString = Type.GetType("System.String");
            DataColumn dc1 = new DataColumn("A",typeInt32);
            DataColumn dc2 = new DataColumn("B",typeString);
            DataColumn dc3 = new DataColumn("C", typeString);
            dt.Columns.Add(dc1);
            dt.Columns.Add(dc2);
            dt.Columns.Add(dc3);

            string rowString = "";

            for (int y = 0; y < dt.Columns.Count; y++)
            {
                if (y > 0)
                {
                    rowString += ",";
                }
                rowString += dt.Columns[y].ColumnName;


            }
                System.Diagnostics.Debug.WriteLine(rowString);

Open in new window



Output:
A,B,C

Open in new window

0
 

Author Comment

by:Delta7428
ID: 39288609
Thanks.  I will test your code in the morning.

But thinking ... Maybe the data table wasn't the best way to go here.   Maybe I have a spreadsheet that doesn't have column names and the the first row is a data row, not column names.    A datatable always assumes the first row is column names ... makes sense, but may not be what I need for other spreadsheet formats.

Seems like a lot of hoopla to get that first row.
0
 
LVL 29

Expert Comment

by:anarki_jimbel
ID: 39288679
0
 

Author Comment

by:Delta7428
ID: 39292712
Thanks anarki.  I got pulled off on another assignment.  I will get back to you in a day or 2.
0
 

Author Comment

by:Delta7428
ID: 39300612
I posted a follow up question .. copied and pasted and submitted it by mistake...  Decided to take another look at resolving followup question on my own.  Looks like I can't delete a comment so I wiped it out and replaced it with this.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Chat Room 1 43
C# Error - Add Failed 12 78
insert image with its metadata into SQL server Database 3 90
Different Delete Messages 7 37
Exception Handling is in the core of any application that is able to dignify its name. In this article, I'll guide you through the process of writing a DRY (Don't Repeat Yourself) Exception Handling mechanism, using Aspect Oriented Programming.
Performance in games development is paramount: every microsecond counts to be able to do everything in less than 33ms (aiming at 16ms). C# foreach statement is one of the worst performance killers, and here I explain why.
This is used to tweak the memory usage for your computer, it is used for servers more so than workstations but just be careful editing registry settings as it may cause irreversible results. I hold no responsibility for anything you do to the regist…
Hi friends,  in this video  I'll show you how new windows 10 user can learn the using of windows 10. Thank you.

861 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

Need Help in Real-Time?

Connect with top rated Experts

29 Experts available now in Live!

Get 1:1 Help Now