DataTable into excel via OpenXML - excel

Question

I have a DataTable like this
Col1 Col2 Col3 col4
GRPs 2009 69952.4 a
GRPs 2010 58949.8 a
GRPs 2009 37251.2 b
GRPs 2010 35433.9 b
GRPs 2009 28039.2 c
GRPs 2010 35079.4 c
SOC 2009 69952.4 a
SOC 2010 58949.8 a
SOC 2009 37251.2 b
SOC 2010 35433.9 b
SOC 2009 28039.2 c
SOC 2010 35079.4 c
And I need a to "transform" it to a excel file using OpenXML with this format
A B C D E F G H I
1 2009 2010 2009 2010 2009 2010
2 GRPs 69952.4 58949.8 37251.2 35433.9 28039.2 35079.4
3 SOC 69952.4 58949.8 37251.2 35433.9 28039.2 35079.4
Thanks in advance

Answer 1

It goes a little like this (sorry this isn't the complete code but it should help):
//Column headers
static string[] headerColumns = new string[] { "A", "B", "C" };
//Used for header column counting
static string alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
foreach (char c in alphabet.Split(alphabet[dt.Columns.Count])[0])
headerColumns[alphabet.IndexOf(c)] = c.ToString();
//Loops through the data table and appends the data rows onto sheet data
for (int r = 0; r < dt.Rows.Count; r++)
{
//Builds a list of values from the data row
List<string> values = new List<string>();
for (int i = 0; i < dt.Columns.Count; i++)
values.Add(dt.Rows[r][i].ToString());
//Creates a spreadsheet row from the list of values
Spreadsheet.Row contentRow = CreateContentRow(values, r + 2);
//Appends the row to the sheetData
sheetData.AppendChild(contentRow);
}
private static Spreadsheet.Row CreateContentRow(List<string> values, int index)
{
//Create the new row.
Spreadsheet.Row r = new Spreadsheet.Row();
r.RowIndex = (UInt32)index;
//Create the cells that contain the data.
for (int i = 0; i < headerColumns.Length; i++)
{
Spreadsheet.Cell c = new Spreadsheet.Cell();
c.CellReference = headerColumns[i] + index;
Spreadsheet.CellValue v = new Spreadsheet.CellValue();
v.Text = values[i];
c.AppendChild(v);
r.AppendChild(c);
}
return r;
}