.Net Core NPOI 导出多级表头

 

想要导出这样的表格

数据准备格式

附上源码

  1 using NPOI.HSSF.UserModel;
  2 using NPOI.SS.UserModel;
  3 using NPOI.SS.Util;
  4 using System.Data;
  5 using System.Text.RegularExpressions;
  6
  7 namespace TestConsoleApp
  8 {
  9     /// <summary>
 10     /// 导出Excel
 11     /// </summary>
 12     public static class ExportHelper
 13     {
 14         public static void Export()
 15         {
 16             var dt = CreteTable();
 17             var titles = GetExcelTitles(dt.Columns, out int maxTitleLevel);
 18
 19             HSSFWorkbook workbook = new HSSFWorkbook();
 20             ISheet sheet = workbook.CreateSheet("Sheet1");
 21
 22             var allRowCount = dt.Rows.Count + maxTitleLevel;
 23             //创建所有单元格
 24             for (int i = 0; i < allRowCount; i++)
 25             {
 26                 var row = sheet.CreateRow(i);
 27                 for (int j = 0; j < dt.Columns.Count; j++)
 28                 {
 29                     row.CreateCell(j);
 30                 }
 31             }
 32
 33             //合并创建表头
 34             foreach (var tit in titles)
 35             {
 36                 sheet.GetRow(tit.StartRow).GetCell(tit.StartColumn).SetCellValue(tit.Title);
 37                 if (tit.MergeColumnCount + tit.MergeRowCount > 0)
 38                 {
 39                     sheet.AddMergedRegion(new CellRangeAddress(tit.StartRow, tit.StartRow + tit.MergeRowCount, tit.StartColumn, tit.StartColumn + tit.MergeColumnCount));
 40                 }
 41             }
 42
 43             //生成数据行
 44             for (int i = 0; i < dt.Rows.Count; i++)
 45             {
 46                 for (int j = 0; j < dt.Columns.Count; j++)
 47                 {
 48                     string cellValue = dt.Rows[i][j].ToString();
 49                    sheet.GetRow(maxTitleLevel + i).Cells[j].SetCellValue(cellValue);
 50                 }
 51             }
 52
 53             using FileStream stm = File.OpenWrite(@"D:\Drivers\Merge.xls");
 54             workbook.Write(stm);
 55         }
 56
 57         private static DataTable CreteTable()
 58         {
 59             DataTable dt = new DataTable();
 60             dt.Columns.Add("编号");
 61             dt.Columns.Add("收入-线上采购-数量");
 62             dt.Columns.Add("收入-线上采购-金额");
 63
 64             dt.Columns.Add("收入-线下采购-数量");
 65             dt.Columns.Add("收入-线下采购-金额");
 66
 67             dt.Columns.Add("回收-数量");
 68             dt.Columns.Add("回收-金额");
 69
 70             dt.Columns.Add("支出-测试01-数量");
 71             dt.Columns.Add("支出-测试01-金额");
 72
 73             dt.Columns.Add("支出-测试02-数量");
 74             dt.Columns.Add("支出-测试02-金额");
 75
 76             dt.Columns.Add("其它-数量");
 77             dt.Columns.Add("其它-金额");
 78
 79             dt.Columns.Add("备注");
 80
 81             for (int i = 1; i <= 100; i++)
 82             {
 83                 var row = dt.NewRow();
 84
 85                 row["编号"] = "编号" + i;
 86                 row["收入-线上采购-数量"] = i;
 87                 row["收入-线上采购-金额"] = i;
 88                 row["收入-线下采购-数量"] = i;
 89                 row["收入-线下采购-金额"] = i;
 90                 row["回收-数量"] = i;
 91                 row["回收-金额"] = i;
 92                 row["支出-测试01-数量"] = i;
 93                 row["支出-测试01-金额"] = i;
 94                 row["支出-测试02-数量"] = i;
 95                 row["支出-测试02-金额"] = i;
 96                 row["其它-数量"] = i;
 97                 row["其它-金额"] = i;
 98                 row["备注"] = i;
 99                 dt.Rows.Add(row);
100             }
101
102             return dt;
103         }
104
105
106         private static List<ExcelTitle> GetExcelTitles(DataColumnCollection columns, out int maxTitleLevel)
107         {
108             maxTitleLevel = 0;
109             List<LevelExcelTitle> levelExcelTitles = new List<LevelExcelTitle>();
110
111             for (var index = 0; index < columns.Count; index++)
112             {
113                 var column = columns[index].ToString();
114
115                 var arr = column.Split("-");
116
117
118                 if (maxTitleLevel < arr.Length)
119                 {
120                     maxTitleLevel = arr.Length;
121                 }
122
123                 for (int i = 0; i < arr.Length; i++)
124                 {
125                     levelExcelTitles.Add(new LevelExcelTitle()
126                     {
127                         Title = arr[i],
128                         LevelCode = string.Join("-", arr[..(i + 1)]),
129                         RowIndex = i,
130                         ColumnIndex = index,
131                         TotalLevel = arr.Length
132                     });
133                 }
134             }
135
136             var titleLevel = maxTitleLevel;
137             var excelTitles = levelExcelTitles
138                 .GroupBy(b => new
139                 {
140                     b.LevelCode,
141                     b.Title
142                 })
143                .Select(b => new ExcelTitle()
144                {
145                    Title = b.Key.Title,
146                    StartRow = b.Min(c => c.RowIndex),
147                    MergeRowCount = b.Min(c => c.RowIndex) + 1 == b.Max(c => c.TotalLevel) ? titleLevel - b.Max(c => c.TotalLevel) : 0,
148
149                    StartColumn = b.Min(c => c.ColumnIndex),
150                    MergeColumnCount = b.Count() - 1,//排除自身
151                }).ToList();
152
153             return excelTitles;
154         }
155     }
156
157     public class ExcelTitle
158     {
159         /// <summary>
160         /// 标题
161         /// </summary>
162         public string Title { get; set; }
163
164         /// <summary>
165         /// 开始行
166         /// </summary>
167         public int StartRow { get; set; }
168
169         /// <summary>
170         /// 合并行
171         /// </summary>
172         public int MergeRowCount { get; set; }
173
174
175         /// <summary>
176         /// 开始列
177         /// </summary>
178         public int StartColumn { get; set; }
179
180         /// <summary>
181         /// 合并列
182         /// </summary>
183         public int MergeColumnCount { get; set; }
184     }
185
186     public class LevelExcelTitle
187     {
188         /// <summary>
189         /// 标题
190         /// </summary>
191         public string Title { get; set; }
192
193         public string LevelCode { get; set; }
194
195         /// <summary>
196         /// 第几行
197         /// </summary>
198         public int RowIndex { get; set; }
199
200         /// <summary>
201         /// 第几列
202         /// </summary>
203         public int ColumnIndex { get; set; }
204
205         /// <summary>
206         /// 总层
207         /// </summary>
208         public int TotalLevel { get; set; }
209     }
210 }