public string Create(BusiReq br)
        {
            try
            {
                var ls = dbContext.BusiReqs.ToList();
                // ProjID+BusiReqNo重复的不导入
                if (ls.Find(a => a.BRProjID == br.BRProjID && a.BusiReqNo == br.BusiReqNo) != null)
                {
                    return "<p class='alert alert-danger'>出错了: 记录已存在,不允许重复添加!" + "</p>";
                }

                dbContext.BusiReqs.Add(br);
                dbContext.SaveChanges();

                return Constants.AJAX_CREATE_SUCCESS_RETURN;
            }
            catch (Exception e1)
            {
                return "<p class='alert alert-danger'>出错了: " + e1.Message + "</p>";
            }
        }
        public ActionResult Import(HttpPostedFileBase file, int BRProjID)
        {
            if (file == null)
            {
                ViewBag.Msg = "<p class='alert alert-danger'>未获取到文件</p>";
            }
            else
            {
                // 判断文件夹是否存在,不存在则创建文件夹
                var dir = HttpContext.Server.MapPath("~/Upload/temp");
                if (Directory.Exists(dir) == false)//如果不存在就创建file文件夹
                {
                    Directory.CreateDirectory(dir);
                }
                string filePath = Path.Combine(dir, Path.GetFileName(file.FileName));
                try
                {
                    file.SaveAs(filePath);
                    // 读取Excel文件
                    FileInfo excelFile = new FileInfo(filePath);

                    using (ExcelPackage ep = new ExcelPackage(excelFile))
                    {
                        ExcelWorksheet worksheet = ep.Workbook.Worksheets[1];

                        //int colStart = worksheet.Dimension.Start.Column;  //工作区开始列
                        //int colEnd = worksheet.Dimension.End.Column;       //工作区结束列
                        int rowStart = worksheet.Dimension.Start.Row;       //工作区开始行号
                        int rowEnd = worksheet.Dimension.End.Row;       //工作区结束行号

                        var ls = dbContext.BusiReqs.ToList();

                        for (int row = rowStart + 1; row <= rowEnd; row++)
                        {
                            // 第一列为空则结束
                            if (worksheet.Cells[row, 1] == null) break;

                            string busiReqNo = worksheet.Cells[row, 1].GetValue<string>();

                            // ProjID+BusiReqNo重复的不导入
                            if (ls.Find(a => a.BRProjID == BRProjID && a.BusiReqNo == busiReqNo) != null)
                            {
                                continue;
                            }

                            BusiReq br = new BusiReq();
                            // 按列赋值
                            br.BRProjID = BRProjID;
                            br.BusiReqNo = busiReqNo;
                            br.BusiReqName = worksheet.Cells[row, 2].GetValue<string>();
                            br.Desc = worksheet.Cells[row, 3].GetValue<string>();
                            // 创建日期若为空则记录为当前时间
                            string createDate = worksheet.Cells[row, 4].GetValue<string>();
                            DateTime tmp = new DateTime();
                            if (!string.IsNullOrEmpty(createDate) && DateTime.TryParse(createDate, out tmp))
                            {
                                br.CreateDate = tmp;
                            }
                            else
                            {
                                br.CreateDate = DateTime.Now;
                            }
                            br.Stat = worksheet.Cells[row, 5].GetValue<string>();

                            dbContext.BusiReqs.Add(br);
                        }
                        // 保存
                        int realNum = dbContext.SaveChanges();

                        string s = string.Format("<p class='alert alert-success'>《{0}》处理成功!共{1}条数据,实际导入{2}条数据</p>", file.FileName, rowEnd - rowStart, realNum);

                        ViewBag.Msg = s;
                    }
                }
                catch (Exception e1)
                {
                    ViewBag.Msg = "<p class='alert alert-danger'>出错了: " + e1.Message + "</p>";
                }
                finally
                {
                    // 完成后删除文件
                    if (System.IO.File.Exists(filePath))
                    {
                        System.IO.File.Delete(filePath);
                    }
                }
            }

            List<BusiReqProj> brProjLs = dbContext.BusiReqProjs.ToList();
            ViewBag.BRProjLs = new SelectList(brProjLs, "BRProjID", "BRProjName");

            return View();
        }
        public string Edit(BusiReq br)
        {
            try
            {
                dbContext.Entry(br).State = System.Data.Entity.EntityState.Modified;
                dbContext.SaveChanges();

                return Constants.AJAX_EDIT_SUCCESS_RETURN;
            }
            catch (Exception e1)
            {
                return "<p class='alert alert-danger'>出错了: " + e1.Message + "</p>";
            }
        }