Winform开发遇到的问题之DataGridView导出Excel

1.代码块：

       //Excel导出功能
       public static void ExportExcel(string fileName, DataGridView dgv)
        {
            if (dgv.Rows.Count > 0)
            {

                string saveFileName = "";
                bool fileSaved = false;
                SaveFileDialog saveDialog = new SaveFileDialog();
                saveDialog.DefaultExt = "xlsx";
                saveDialog.Filter = "Excel文件|*.xlsx";
                saveDialog.FileName = fileName;
                saveDialog.ShowDialog();
                saveFileName = saveDialog.FileName;
                if (saveFileName.IndexOf(":") < 0) return; //被点了取消   
                Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();
                if (xlApp == null)
                {
                    MessageBox.Show("无法创建Excel对象，可能您的机子未安装Excel");
                    return;
                }

                Microsoft.Office.Interop.Excel.Workbooks workbooks = xlApp.Workbooks;
                Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
                Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1];//取得sheet1  

                //写入标题  
                for (int i = 0; i < dgv.ColumnCount; i++)
                {
                    worksheet.Cells[1, i + 1] = dgv.Columns[i].HeaderText;
                }
                //写入数值  
                for (int r = 0; r < dgv.Rows.Count; r++)
                {
                    for (int i = 0; i < dgv.ColumnCount; i++)
                    {
                        worksheet.Cells[r + 2, i + 1] = dgv.Rows[r].Cells[i].Value;
                    }
                    System.Windows.Forms.Application.DoEvents();
                }
                worksheet.Columns.EntireColumn.AutoFit();//列宽自适应                  
                if (saveFileName != "")
                {
                    try
                    {
                        workbook.Saved = true;
                        workbook.SaveCopyAs(saveFileName);
                        fileSaved = true;
                    }
                    catch (Exception ex)
                    {
                        fileSaved = false;
                        MessageBox.Show("导出文件时出错,文件可能正被打开！\n" + ex.Message);
                    }

                }
                else
                {
                    fileSaved = false;
                }
                xlApp.Quit();
                GC.Collect();//强行销毁                                              
                if (DialogResult.Yes == MessageBox.Show("是否需要打开此文件!", "提示", MessageBoxButtons.YesNo))
                {
                    if (fileSaved && System.IO.File.Exists(saveFileName)) System.Diagnostics.Process.Start(saveFileName); //打开EXCEL 
                }
                else
                {
                 MessageBox.Show(fileName + "刷卡记录保存成功!", "提示", MessageBoxButtons.OK);
                }
            }
            else
            {
                MessageBox.Show("报表为空,无表格需要导出", "提示", MessageBoxButtons.OK);
            }

        }
        //调用[绑定按钮事件]
        private void btn_LatelyCurrent_Click(object sender, EventArgs e)
        {
            var date = DateTime.Now.ToString("yyyy-MM-dd_HH-mm-ss");
            date = "SKJL_"+date;
            //date:文件名称；dgStaff1:DataGridView控件名称
            ExportExcel(date, dgStaff1);
        }

2.效果图：

3.Excel文件：