NPOI，给指定的excle创建个下拉框验证

NPOI，给指定的excle创建个下拉框验证

先大致看下效果吧

Nuget  搜索 NPOI，一般出来的第一个就是，安装NPOI基础环境

  1 using NPOI.HSSF.UserModel;
  2 using NPOI.OpenXmlFormats.Spreadsheet;
  3 using NPOI.SS.UserModel;
  4 using NPOI.SS.Util;
  5 using NPOI.XSSF.UserModel;
  6 using System;
  7 using System.Collections.Generic;
  8 using System.IO;
  9 using System.Linq;
 10 using System.Text;
 11 using System.Threading.Tasks;
 12 using System.Windows;
 13 using System.Windows.Controls;
 14 using System.Windows.Data;
 15 using System.Windows.Documents;
 16 using System.Windows.Input;
 17 using System.Windows.Media;
 18 using System.Windows.Media.Imaging;
 19 using System.Windows.Navigation;
 20 using System.Windows.Shapes;
 21 using Path = System.IO.Path;
 22 
 23 namespace NPOIDemo
 24 {
 25     /// <summary>
 26     /// MainWindow.xaml 的交互逻辑
 27     /// </summary>
 28     public partial class MainWindow : Window
 29     {
 30         public MainWindow()
 31         {
 32             InitializeComponent();
 33 
 34             var ff = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "服务器导入模板.xlsx");
 35             CreateCellDropDownList(
 36                 ff,
 37                 new string[] { "1111", "2222", "3333", "4444" },
 38                 1, 4, 3, 3
 39                 );
 40             System.Diagnostics.Process.Start(ff);
 41         }
 42 
 43         /// <summary>
 44         /// 给指定的excle添加个下拉框验证
 45         /// 备注：只能给未添加下拉框验证的添加，追加的情况不理想
 46         /// </summary>
 47         /// <param name="exclepath">excle路径</param>
 48         /// <param name="dropDownConstraint">有效值集合</param>
 49         public void CreateCellDropDownList(string exclepath, string[] dropDownlist, int firstRow = 0, int lastRow = 65535, int firstCol = 0, int lastCol = 256)
 50         {
 51             FileInfo file = new FileInfo(exclepath);
 52             if (!file.Exists)
 53             {
 54                 throw new FileNotFoundException("Excle文件不存在！");
 55             }
 56             if (dropDownlist == null || dropDownlist.Length == 0)
 57             {
 58                 throw new ValueUnavailableException("有效值集合不允许为空！");
 59             }
 60             if (firstRow < 0 || lastRow < 0 || firstCol < 0 || lastCol < 0)
 61             {
 62                 throw new IndexOutOfRangeException("索引值下标有误，从0开始！");
 63             }
 64             file.IsReadOnly = false;
 65 
 66             IWorkbook workbook = null;
 67 
 68             using (FileStream fs = File.Open(file.FullName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
 69             {
 70                 workbook = new XSSFWorkbook(fs);
 71             }
 72 
 73             ISheet sheet = workbook.GetSheetAt(0);
 74 
 75             //设置默认值
 76 
 77             for (int irow = firstRow, length = lastRow; irow <= length; irow++)
 78             {
 79                 var row = sheet.GetRow(irow);
 80                 if (row == null)
 81                 {
 82                     continue;
 83                 }
 84 
 85                 for (int icell = firstCol, lengthc = lastCol; icell <= lengthc; icell++)
 86                 {
 87                     var cell = row.GetCell(icell);
 88                     if (cell == null)
 89                     {
 90                         continue;
 91                     }
 92                     cell.SetCellValue(dropDownlist.First());
 93                 }
 94             }
 95 
 96             //设置生成下拉框的行和列
 97             CellRangeAddressList cellRegions = new CellRangeAddressList(firstRow, lastRow, firstCol, lastCol);
 98 
 99             XSSFDataValidationHelper helper = new XSSFDataValidationHelper((XSSFSheet)sheet);
100             //启用下拉验证
101             var dropDownConstraint = helper.CreateExplicitListConstraint(dropDownlist);
102             IDataValidation dropDownValidation = helper.CreateValidation(dropDownConstraint, cellRegions);
103             sheet.AddValidationData(dropDownValidation);
104             sheet.ValidateMergedRegions();
105 
106             var filenew = Path.Combine(file.DirectoryName, "filenew" + Path.GetExtension(file.Name));
107             using (FileStream fs = File.Open(filenew, FileMode.OpenOrCreate, FileAccess.ReadWrite))
108             {
109                 workbook.Write(fs);
110             }
111 
112             //因为暂时无法解决编辑的情况，所以迂回下，删除原始再覆盖下
113             File.Delete(file.FullName);
114             File.Move(filenew, file.FullName);
115         }
116     }
117 }

特此说明下：添加下拉框数据验证在已经存在的情况不理想，后面生成的会失效，暂时没找到解决办法，只有每次生成的数据操作一个空数据验证的模板