Exporting DataGridView records to Excel

Question

I have a datagridview with several columns and different report types, where I have a method to export the records to Excel spreadsheet, in this datagridview I leave some columns like: visible = false according to the selected report type.

In the export method for spreadsheet I have a validation to consider only visible cells, true but it is not working.

        int XLRow = 1;
        int XLCol = 1;

        // Export header
        for (int i = 0; i < datagrid.Columns.Count; i++)
        {
            if (datagrid.Columns[i].Visible == true)
                xlWorkSheet.Cells[XLRow, XLCol++] = datagrid.Columns[i].HeaderText;
        }

        XLRow = 2;
        XLCol = 1;

        // Controls for scrolling through records do DataGridView
        for (int i = 0; i < datagrid.RowCount; i++)
        {
            for (int j = 0; j < datagrid.ColumnCount; j++)
            {
                DataGridViewCell cell = datagrid[j, i];
                string conteudo = string.Empty;
                if ((cell.Value != null) && (!string.IsNullOrEmpty(cell.Value.ToString())) && cell.Visible == true)
                {
                    conteudo = cell.Value.ToString();
                    if ((Funcoes.EhNumerico(conteudo)) && (conteudo.Length > 8))
                    {
                        conteudo = string.Concat("'", conteudo);
                    }
                    xlWorkSheet.Cells[XLRow, XLCol++] = conteudo;
                }
                XLRow++;
                XLCol = 1;
            }
        }

The spreadsheet leaves with the columns that are visible = false in white, as follows:

How can I resolve this?

Answer 1

In other words… in the first for loop… if the column is not visible… then you DO NOT want to increment i … and this is obviously going to mess up the for loop. Hence my suggestion to create two (2) int variables… int XLRow and int XLColumn , then use those indexes specifically for the WORKSHEET. Then loop through the grid columns as your code does using i and j , however, when a column is found that is not visible, then you DO NOT want to increment the XLCol index.

It will be a challenging juggling the loops i or j variables to also be used as an index into the worksheet columns as they may be completely “different” indexes. This is why I say “separate” them from the git go and keep it simple. Something like…

int XLRow = 1;
int XLCol = 1;
for (int i = 0; i < datagrid.Columns.Count; i++) {
  if (datagrid.Columns[i].Visible == true)
    xlWorkSheet.Cells[XLRow, XLCol++] = datagrid.Columns[i].HeaderText;
}
XLRow = 2;
XLCol = 1;
for (int i = 0; i < datagrid.RowCount; i++) {
  for (int j = 0; j < datagrid.ColumnCount; j++) {
    if (datagrid.Columns[j].Visible) {
      DataGridViewCell cell = datagrid[j, i];
      string conteudo = string.Empty;
      if ((cell.Value != null) && (!string.IsNullOrEmpty(cell.Value.ToString()))) {
        conteudo = cell.Value.ToString();
        if ((Funcoes.EhNumerico(conteudo)) && (conteudo.Length > 8)) {
          conteudo = string.Concat("'", conteudo);
        }
        xlWorkSheet.Cells[XLRow, XLCol++] = conteudo;
      }
    }
  }
  XLRow++;
  XLCol = 1;
}