从c＃导出到excel不显示数据库的第一行

Question

I am trying to export a database from c# to excel but the first row from the database is not saving in excel.

private void exporttoexcel()
{
    Microsoft.Office.Interop.Excel._Application excel = new Microsoft.Office.Interop.Excel.Application();
    Microsoft.Office.Interop.Excel._Workbook workbook = excel.Workbooks.Add(Type.Missing);
    Microsoft.Office.Interop.Excel._Worksheet worksheet = null;

    try
    {
        worksheet = workbook.ActiveSheet;
        worksheet.Name = "ExportedFromDatGrid";

        int cellRowIndex = 1;
        int cellColumnIndex = 1;

        //Loop through each row and read value from each column. 
        for (int i = 0; i < dataGridView1.Rows.Count - 1; i++)
        {
            for (int j = 0; j < dataGridView1.Columns.Count; j++)
            {
                // Excel index starts from 1,1. As first Row would have the Column headers, adding a condition check. 
                if (cellRowIndex == 1)
                {
                    worksheet.Cells[cellRowIndex, cellColumnIndex] = dataGridView1.Columns[j].HeaderText;
                }
                else
                {
                    worksheet.Cells[cellRowIndex, cellColumnIndex] = dataGridView1.Rows[i].Cells[j].Value.ToString();
                }
                cellColumnIndex++;
            }
            cellColumnIndex = 1;
            cellRowIndex++;
        }
   }
   catch(Exception ex)
   {
   }
}

here is the code I'm using. could anyone help me ? I am new in coding.

Answer 1

You're not writing out the data but are only writing out column names when the cellColumnIndex is 1, skipping the first row. But after the first row has been processed, the row index will be incremented. Refactor your for-loop to look something like this:

// Add the column names
var index = 0;
foreach(var column in dataGridView1.Columns)
{
    worksheet.Cells[0, index] = column.HeaderText;
    index++;
}

//Loop through each row and read value from each column. 
for (int i = 0; i < dataGridView1.Rows.Count - 1; i++)
{
    for (int j = 0; j < dataGridView1.Columns.Count; j++)
    {
        // Excel index starts from 1,1. As first Row would have the Column headers, adding a condition check. 
        worksheet.Cells[cellRowIndex, cellColumnIndex] = dataGridView1.Rows[i].Cells[j].Value.ToString();
        cellColumnIndex++;
    }
    cellColumnIndex = 1;
    cellRowIndex++;
}

Please have a look at ClosedXML . It simplifies writing your code, and eliminate the need to have Excel installed on the machine where you want to run this.