excel 导入 与 导出

Excel导入

public ActionResult Excel(HttpPostedFileBase file)
        {
            HttpPostedFileBase files = file;//接收客户端传递过来的数据.
            try
            {
                if (files == null)
                {
                    return Content("请选择上传的Excel文件");
                }
                else
                {
                    file.SaveAs(Server.MapPath("~/UploadFile/Excel/" + file.FileName));
                    //对文件的格式判断，此处省略
                    AltasEntities db = new AltasEntities();//EF上下文对象
                    Stream inputStream = files.InputStream;
                    IWorkbook workbook;
                    string fileExt = Path.GetExtension(files.FileName);

                    if (fileExt == ".xls")
                    {
                        workbook = new HSSFWorkbook(inputStream);
                    }
                    else if (fileExt == ".xlsx")
                    {
                        workbook = new XSSFWorkbook(inputStream);
                    }
                    else
                    {
                        return null;
                    }
                    NPOI.SS.UserModel.ISheet sheet = workbook.GetSheetAt(0);
                    int rowCount = sheet.LastRowNum + 1;

                    for (int i = (sheet.FirstRowNum + 1); i <= rowCount - 1; i++)
                    {
                        IRow row = sheet.GetRow(i);
                        Equiemints model = new Equiemints();

                        if (row != null)
                        {
                            if (row.GetCell(0) != null)
                            {
                                model.EquiemintId = GetCellValue(row.GetCell(0)).ToUpper();
                            }
                            if (row.GetCell(1) != null)
                            {
                                model.Company = GetCellValue(row.GetCell(1));
                            }
                            if (row.GetCell(2) != null)
                            {
                                model.ModelsType = GetCellValue(row.GetCell(2));
                            }
                            if (row.GetCell(3) != null)
                            {
                                model.OpenCreatetime = DateTime.Parse(GetCellValue(row.GetCell(3)));
                            }
                            if (row.GetCell(4) != null)
                            {
                                model.ZBType = GetCellValue(row.GetCell(4));
                            }
                            if (row.GetCell(5) != null)
                            {
                                model.ZBEndCreatetime = DateTime.Parse(GetCellValue(row.GetCell(5)));
                                //model.SalesName = GetCellValue(row.GetCell(5));
                            }
                            if (row.GetCell(6) != null)
                            {
                                model.a1 = GetCellValue(row.GetCell(6));
                            }
                            if (row.GetCell(7) != null)
                            {
                                model.a2 = GetCellValue(row.GetCell(7));
                            }
                            if (row.GetCell(8) != null)
                            {
                               model.a3 = GetCellValue(row.GetCell(8));
                            }
                            if (row.GetCell(9) != null)
                            {
                               model.a4 = GetCellValue(row.GetCell(9));
                            }
                            if (row.GetCell(10) != null)
                            {
                               model.a5 = GetCellValue(row.GetCell(10));
                            }
                        }

                        db.Equiemints.Add(model);
                    }
                    db.SaveChanges();
                    return Content("<script>alert('导入成功！',location.href='/Equiemints/Index');</script>");

                }

            }
            catch (Exception)
            {
                return Content("<script>alert('导入失败！');</script>");
            }

        }

        /// <summary>  
        /// 根据Excel列类型获取列的值  
        /// </summary>  
        /// <param name="cell">Excel列</param>  
        /// <returns></returns>  
        private static string GetCellValue(ICell cell)
        {
            if (cell == null)
                return string.Empty;
            switch (cell.CellType)
            {
                case CellType.Blank:
                    return string.Empty;
                case CellType.Boolean:
                    return cell.BooleanCellValue.ToString();
                case CellType.Error:
                    return cell.ErrorCellValue.ToString();
                case CellType.Numeric:
                case CellType.Unknown:
                default:
                    return cell.ToString();
                case CellType.String:
                    return cell.StringCellValue;
                case CellType.Formula:
                    try
                    {
                        HSSFFormulaEvaluator e = new HSSFFormulaEvaluator(cell.Sheet.Workbook);
                        e.EvaluateInCell(cell);
                        return cell.ToString();
                    }
                    catch
                    {
                        return cell.NumericCellValue.ToString();
                    }
            }
        }

Excel导出

  public ActionResult DcExcel(List<int> id)
        {
             var db = new AltasEntities();
            if (id == null)
            {
                id = db.Equiemints.Select(s => s.Id).ToList();
            }
            string filename = DateTime.Now.ToString("yyyyMMddHHmmss") + ".csv";

            string path = Server.MapPath("/UploadFile/" + filename);
            FileInfo fi = new FileInfo(path);
            using (StreamWriter sw = fi.CreateText())
            {
                sw.WriteLine("设备序号,所属公司,机型,开始时间,质保类型,结束时间,服务销售,是否绑定,字段1,字段2,字段3");
                foreach (int i in id)
                {

　　　　　　　　//找到要导出的数据
                    var saa = db.Equiemints.Find(i);
                    if (saa.a1==null)
                    {
                        saa.a1 = "无";
                    }
                    if (saa.a2 == null)
                    {
                        saa.a2 = "无";
                    }
                    if (saa.a3 == null)
                    {
                        saa.a3 = "无";
                    }
                    sw.WriteLine(
                        saa.EquiemintId.ToString()
                        + "," + saa.Company.ToString()
                        + "," + saa.ModelsType.ToString()
                         + "," + saa.OpenCreatetime.ToString()
                         + "," + saa.ZBType.ToString()
                         + "," + saa.ZBEndCreatetime.ToString()
                          + "," + saa.uname.ToString()
                          + "," + saa.bangname.ToString()
                         + "," + saa.a1.ToString()
                         + "," + saa.a2.ToString()
                         + "," + saa.a3.ToString()
                        );
                }
                sw.Close();
            }
           
            var name = Path.GetFileName(path);
            return File(path, "application/x-zip-compressed", name);
        }