C#將DataTable導出到Excle並保存至硬盤

             #region 寫入excle,dt爲要寫入excle的dataTable

            Microsoft.Office.Interop.Excel.Application app =
            new Microsoft.Office.Interop.Excel.Application();
   
            app.Visible = false;
            Microsoft.Office.Interop.Excel.Workbook  wBook = app.Workbooks.Add(true);
           Microsoft.Office.Interop.Excel.Worksheet wSheet = wBook.Worksheets[1] as Microsoft.Office.Interop.Excel.Worksheet;
            if (dt.Rows.Count > 0)
              {
                   int row = 0;
                    row = dt.Rows.Count;
                  int col = dt.Columns.Count;
                   for (int i = 0; i < row; i++)
                    {
                        for (int j = 0; j < col; j++)
                        {
                            string str = dt.Rows[i][j].ToString();
                            wSheet.Cells[i + 2, j + 1] = str;
                       }
                   }
              }
                int size = dt.Columns.Count;
              for (int i = 0; i < size; i++)
              {
                  wSheet.Cells[1, 1 + i] = dt.Columns[i].ColumnName;
                }

              string filename = System.DateTime.Now.ToString("yyyy-MM-dd") + ".xlsx";   //"/File/" +
              string filepath ="C:\\ScheduledJob\\weeklyreport\\"+filename;     //System.Web.HttpContext.Current.Server.MapPath(filename);

               //設置禁止彈出保存和覆蓋的詢問提示框      
                app.DisplayAlerts = false;             
                app.AlertBeforeOverwriting = false;
                //保存工作簿          
               // wBook.Save();
                wBook.Saved = true;
               wBook.SaveCopyAs(filepath);
         
                //保存excel文件            
                // app.Save(filepath); 
                // app.SaveWorkspace(filepath);
                app.Quit();
               app = null;
            #endregion