c#NPOI使用簡1

在vs開發軟件中通過nuget安裝npoi

 //讀取excel表格數據，並判斷表頭是否符合要求 (電腦可不安裝office)
        public static void ReadExcel()
        {
            string filePath = @"C:\Users\Administrator\Desktop\as.xlsx";
            FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
            List<IRow> rowlist = new List<IRow>();
            //創建工作簿對象
            XSSFWorkbook workbook = new XSSFWorkbook(fileStream);
            ISheet sheet = workbook.GetSheetAt(0);//獲取第一張表
            for (int i = 0; i < sheet.LastRowNum; i++)
            {
                IRow row = sheet.GetRow(i);
                rowlist.Add(row);
                row = null;
            }
            IRow indexRow = rowlist[0];
            rowlist.Remove(indexRow);//移除表頭，直接循環列表值
            //循環表體每一行數據
            for (int i = 0; i < rowlist.Count; i++)
            {
                //循環每一行中每個單元格數據
                for (int j = 0; j < rowlist[i].Cells.Count; j++)
                {
                    //判斷當前循環單元格數據是否符合要求
                    if (indexRow.GetCell(j).ToString().Contains("oid"))
                    {
                        Console.WriteLine(rowlist[i].GetCell(j).ToString());
                    }
                    else if (indexRow.GetCell(j).ToString().Contains("卡卡西"))
                    {
                        Console.WriteLine(rowlist[i].GetCell(j).ToString());
                    }
                }
            }
        }

 public static void ExportExcel()
        {
            IWorkbook workbook = new XSSFWorkbook();
            ISheet sheetx = workbook.CreateSheet("郵件信息");
            //第一個是列索引：1表示第二列單元格，第二個參數是表示單元格字符數 30 * 256 表示該單元格可存儲30個字符
            sheetx.SetColumnWidth(1, 15 * 256);
            IRow row1 = sheetx.CreateRow(0);
            row1.CreateCell(0).SetCellValue("用戶郵件信息");
            //row1.Height = 50 * 10;
            IRow rowx0 = sheetx.CreateRow(1);
            List<EmailModel> list = EmailDal.GetModelList("","emailId,UserId");
            rowx0.CreateCell(0).SetCellValue("郵件ID");
            rowx0.CreateCell(1).SetCellValue("用戶ID");
            rowx0.Height = 30 * 10;
            XSSFCellStyle fCellStyle = (XSSFCellStyle)workbook.CreateCellStyle();
            XSSFFont ffont = (XSSFFont)workbook.CreateFont();
            //給字體設置顏色
            ffont.Color = HSSFColor.Red.Index;
            //給樣式添加字體
            fCellStyle.SetFont(ffont);
            for (int i = 0; i < list.Count; i++)
            {
                IRow rowdata = sheetx.CreateRow(i + 2);
                rowdata.CreateCell(0).SetCellValue(list[i].emailId);
                rowdata.Height = 30 * 10;
                rowdata.GetCell(0).CellStyle = fCellStyle;
                rowdata.CreateCell(1).SetCellValue(list[i].UserId.ToString());
            }
            var filePath = "";
            var fileName = Guid.NewGuid() + "-用戶郵件表";

            //如果是web，則注釋該行代碼
            filePath = @"C:\Users\Administrator\Desktop\" + fileName + ".xlsx";
            using (FileStream url = File.OpenWrite(filePath))
            {
                workbook.Write(url);
            }; 

MemoryStream ms = new MemoryStream();
workbook.Write(ms);
Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}.xlsx", fileName));
Response.BinaryWrite(ms.ToArray());
Response.End();
workbook = null;
ms.Close();
ms.Dispose();

        }

 

通過讀取excel表格來判斷表頭數據
NPOI安裝dll文件下載：

鏈接：https://pan.baidu.com/s/1QiRVGsjr5qoLkgv64VfOKQ
提取碼：oguw