找不到第 25 列异常

Question

我正在创建一份报告，其中数据从我的访问数据库导出到 excel 此处。我没有使用任何 datagridview ，当用户单击一个复选框时，他可以为此下载相应的报告我已经编写了代码但是当我运行这段代码给我找不到第 25 列时，我不知道为什么它给我看这个？在访问 table 中，我共有 25 列：

string sql = null;
            string data = null;
            int i = 0;
            int j = 0;

            Excel.Application xlApp;
            Excel.Workbook xlWorkBook;
            Excel.Worksheet xlWorkSheet;
            object misValue = System.Reflection.Missing.Value;

            xlApp = new Excel.Application();
            xlWorkBook = xlApp.Workbooks.Add(misValue);
            xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
   string connectionString = null;

            connectionString = ConfigurationManager.ConnectionStrings["AccessConnectionString"].ConnectionString;

            cnn.ConnectionString = connectionString;
            cnn.Open();
            sql = "SELECT * FROM Billing WHERE Bill_No and Bill_Date is null order by FormNo desc";
            OleDbDataAdapter dscmd = new OleDbDataAdapter(sql, cnn);
            DataSet ds = new DataSet();
            dscmd.Fill(ds);
            cnn.Close();
 for (j = 0; i < ds.Tables[0].Columns.Count; j++)
            {

                xlWorkSheet.Cells[1, j + 1] = ds.Tables[0].Columns[j].Caption; // Exception coming this line 
            }

            for (i = 0; i < ds.Tables[0].Rows.Count; i++)
            {
                for (j = 0; j < ds.Tables[0].Columns.Count; j++)
                {
                    data = ds.Tables[0].Rows[i].ItemArray[j].ToString();
                    xlWorkSheet.Cells[i + 2, j + 1] = data;
                }
            }
   System.Windows.Forms.SaveFileDialog saveDlg = new System.Windows.Forms.SaveFileDialog();
            saveDlg.InitialDirectory = @"C:\";
            saveDlg.Filter = "Excel files (*.xls)|*.xls";
            saveDlg.FilterIndex = 0;
            saveDlg.RestoreDirectory = true;
            saveDlg.Title = "Export Excel File To";
xlWorkBook.Close(true, misValue, misValue);
            MessageBox.Show("File Downloaded successfully...");
            xlApp.Quit();
}

Answer 1

我在这里得到了答案我改变了我的for循环

    for (i = 0; i <= ds.Tables[0].Rows.Count - 1; i++)
    {
        for (j = 0; j <= ds.Tables[0].Columns.Count - 1; j++)
        {
            xlWorkSheet.Cells[1, j + 1] = ds.Tables[0].Columns[j].Caption;
            data = ds.Tables[0].Rows[i].ItemArray[j].ToString();
            xlWorkSheet.Cells[i + 2, j + 1] = data;
        }
    }

找不到第 25 列异常

Cannot find column 25 Exception coming

ms-access-2007

c#-3.0