winform 导出Excel

public void ExportDataGridViewToExcel(string fileName, DataGridView dgv)
        {
            try
            {
                if (dgv.Rows.Count > 0)
                {

                    string saveFileName = "";
                    //bool fileSaved = false;  
                    SaveFileDialog saveDialog = new SaveFileDialog();
                    saveDialog.DefaultExt = "xls";
                    saveDialog.Filter = "Excel文件|*.xls";
                    saveDialog.FileName = fileName;

                    if (saveDialog.ShowDialog() == DialogResult.OK) //点击确定
                    {
                        saveFileName = saveDialog.FileName;
                        Workbook wb = new Workbook(Aspose.Cells.FileFormatType.Xlsx);
                        try
                        {
                            Worksheet sheet = wb.Worksheets[0];
                            //写入标题
                            int headindex = 0;
                            for (int i = 0; i < dgv.ColumnCount; i++)
                            {
                                if (dgv.Columns[i].Visible)
                                {
                                    sheet.Cells[0, headindex].PutValue(dgv.Columns[i].HeaderText);
                                    headindex++;
                                }
                            }
                            //写入数据
                            for (int r = 0; r < dgv.Rows.Count; r++)
                            {
                                int rowindex = 0;
                                for (int i = 0; i < dgv.ColumnCount; i++)
                                {
                                    if (dgv.Columns[i].Visible)
                                    {
                                        sheet.Cells[r + 1, rowindex].PutValue(dgv.Rows[r].Cells[i].Value == null ? "" : dgv.Rows[r].Cells[i].Value.ToString(), true);
                                        if (dgv.Columns[i].HeaderText.Contains("数量"))
                                        {
                                            sheet.Cells[r + 1, rowindex].PutValue(dgv.Rows[r].Cells[i].Value == null ? "" : dgv.Rows[r].Cells[i].Value.ToString(), true);
                                            //Style style = sheet.Cells[r + 1, rowindex].GetStyle();
                                            //style.Number = 1;
                                            //sheet.Cells[r + 1, rowindex].SetStyle(style);
                                        }
                                        else
                                        {
                                            sheet.Cells[r + 1, rowindex].PutValue(dgv.Rows[r].Cells[i].FormattedValue);
                                        }
                                        rowindex++;
                                    }
                                }
                                System.Windows.Forms.Application.DoEvents();
                            }
                            sheet.AutoFitColumns();//列宽自适应 
                            wb.Save(saveFileName);
                            GC.Collect();//强行销毁 
                            //给个提示框
                        }
                        catch (Exception ex)
                        {
                            MessageBox.Show(ex.Message);
                        }
                    }
                    else
                    {
                        GC.Collect();//强行销毁 
                        return;
                    }
                }
                else
                {
                    MessageBox.Show("报表为空,无表格需要导出", "提示", MessageBoxButtons.OK);
                }
            }
            catch (Exception)
            {
                MessageBox.Show("导出错误！", "提示", MessageBoxButtons.OK);
            }

        }

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winform 导出Excel