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  • 关于Npoi+excel文件读取,修改文件内容的处理方式

    因最近有需求场景,实现对文件的读写操作,又不单独生成新的文件,对于源文件的修改,做了一个简单实现,如下↓


     1 // 要操作的excel文件路径
     2             string fileName = Server.MapPath("~/Content/test.xlsx");
     3             if (!System.IO.File.Exists(fileName)) return Content("文件不存在!");
     4             IWorkbook workbook;
     5 
     6             //把文件内容导入到工作薄当中,然后关闭文件
     7             FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.ReadWrite);
     8 
     9             workbook = WorkbookFactory.Create(fs);
    10             fs.Close();//编辑工作薄当中内容            
    11             ISheet sheet = workbook.GetSheetAt(0);
    12 
    13 
    14             //workbook.GetSheetAt(0).GetRow(0).Cells[0].SetCellValue("TestCell");
    15             for (int i = 0; i <= sheet.LastRowNum; i++)
    16             {
    17                 foreach (ICell cell in sheet.GetRow(i).Cells)
    18                 {
    23                     cell.SetCellType(cell.CellType);
    24                     if (cell.CellType == CellType.Numeric)
    25                     {
    26                         if (HSSFDateUtil.IsCellDateFormatted(cell))//日期类型
    27                         {
    28                             cell.SetCellValue(cell.DateCellValue.ToString());
    29                         }
    30                         else//其他数字类型
    31                         {
    32                             cell.SetCellValue(cell.NumericCellValue.ToString());
    33                         }
    34                     }
    35                     else
    36                     {
    37                         cell.SetCellValue(cell.StringCellValue.ToString());
    38                     }
    39                 }
    40                 if (i != 0)
    41                 {
    42                     ICell firstCell = sheet.GetRow(i).Cells[0];
    43                     firstCell.SetCellType(firstCell.CellType);
    44                     var cellValue = firstCell.StringCellValue.ToDecimal().ToString();
    45                     firstCell.SetCellValue(cellValue);
    46                 }
    47             }
    48 
    49             //把编辑过后的工作薄重新保存为excel文件
    50             FileStream fs2 = System.IO.File.Create(fileName);
    51             workbook.Write(fs2);
    52             fs2.Close();
    53             return Content("操作成功!!" + DateTime.Now);

    读取文件内容更新文件状态

     1 // 要操作的excel文件路径
     2             string fileName = Server.MapPath("~/Content/test.xlsx");
     3             if (!System.IO.File.Exists(fileName)) return Content("文件不存在,请检查路径及文件名称是否正确!");
     4             //IWorkbook workbook;
     5             //把文件内容导入到工作薄当中,然后关闭文件
     6             //FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.ReadWrite);
     7             //workbook = WorkbookFactory.Create(fs);
     8             //fs.Close();//编辑工作薄当中内容     
     9             //如果是xls,使用HSSFWorkbook;如果是xlsx,使用XSSFWorkbook
    10             XSSFWorkbook xssFWorkbook;
    11             using (FileStream file = new FileStream(fileName, FileMode.Open, FileAccess.ReadWrite))
    12             {
    13                 xssFWorkbook = new XSSFWorkbook(file);
    14             }
    15 
    16             ISheet sheet = xssFWorkbook.GetSheetAt(0);
    17             var userList = GetUserLists(sheet);
    18             var userNames = userList.Select(u =>
    19             {
    20                 return u.UserName.Replace(u.UserName, $"'{u.UserName}'");
    21             });
    22             var companyNames = userList.Select(u =>
    23             {
    24                 return u.CompanyName.Replace(u.CompanyName, $"'{u.CompanyName}'");
    25             });
    26 
    27             var userIdCards = userList.Select((u, i) =>
    28              {
    29                  return $" SELECT '{u.UserName}' AS UserName,'{u.CompanyName}' AS CompanyName,'{u.LegalPersonIdNumber}' AS LegalPersonIdNumber ";
    30              });
    31             var dataList = AsyncHelper.RunSync(() => _userIdFileAppService.RunSearchAndUpdateData(
    32                 new UserIdentityCardInput
    33                 {
    34                     UserNameString = string.Join(",", userNames),
    35                     CompanyNameString = string.Join(",", companyNames),
    36                     UserIdCardString = string.Format(@"SELECT * INTO #tbUserIdCardTable FROM ( {0} ) a;", string.Join("  UNION  ", userIdCards))
    37                 }
    38                 ));
    39             for (int i = 0; i <= sheet.LastRowNum; i++)
    40             {
    41                 if (i != 0)
    42                 {
    43                     var userName = sheet.GetRow(i).Cells[0].ToString();
    44                     var companyName = sheet.GetRow(i).Cells[1].ToString();
    45                     //添加列
    46                     ICell lastCell = sheet.GetRow(i).CreateCell(3);
    47                     lastCell.SetCellType(lastCell.CellType);
    48                     ICellStyle newStyle = xssFWorkbook.CreateCellStyle();
    49                     //XSSFCellStyle styleTemp = ((XSSFCellStyle)newStyle);
    50                     //HSSFPalette palette = xssFWorkbook.GetCustomPalette();
    51 
    52                     if (dataList.Find(a => a.UserName == userName && a.CompanyName == companyName) != null)
    53                     {
    54                         lastCell.SetCellValue("已更新");
    55                         //Color c = Color.FromArgb(98, 185, 106);
    56                         //palette.SetColorAtIndex((short)9, c.R, c.G, c.B);
    57                         //var color = palette.FindColor(c.R, c.G, c.B);
    58                         //newStyle.FillPattern = FillPattern.SolidForeground;
    59                         //newStyle.FillForegroundColor = color.Indexed;
    60 
    61                         XSSFColor color = new XSSFColor();
    62                         color.SetRgb(new byte[] { 255, 255, 0 });
    63                         newStyle.FillPattern = FillPattern.SolidForeground;
    64                         newStyle.FillForegroundColor = 13;
    65                     }
    66                     else
    67                     {
    68                         lastCell.SetCellValue("未更新");
    69                         //创建字体
    70                         XSSFFont ffont = (XSSFFont)xssFWorkbook.CreateFont();
    71                         XSSFColor color = new XSSFColor();
    72                         color.SetRgb(new byte[] { 255, 51, 0 });
    73                         //给字体设置颜色
    74                         ffont.Color = color.Indexed;
    75                         //给样式添加字体
    76                         newStyle.SetFont(ffont);
    77 
    78                         newStyle.FillPattern = FillPattern.SolidForeground;
    79                         newStyle.FillForegroundColor = 10;
    80 
    81                     }
    82                     lastCell.CellStyle = newStyle;
    83                 }
    84             }
    85 
    86             //把编辑过后的工作薄重新保存为excel文件
    87             FileStream fs2 = System.IO.File.Create(fileName);
    88             xssFWorkbook.Write(fs2);
    89             fs2.Close();
    90             return Content("操作成功!!" + DateTime.Now);
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  • 原文地址:https://www.cnblogs.com/24klr/p/11383672.html
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