C# Excel 读取为Datatable

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Linq;
  4 using System.Text;
  5 using System.Data;
  6 using OfficeOpenXml;
  7 using System.IO;
  8 using NPOI.SS.UserModel;
  9 using NPOI.HSSF.Util;
 10 using NPOI.HSSF.UserModel;
 11 
 12 public class ExcelUtil
 13     {
 14         /// <summary>
 15         /// Excel 转 DataTable 约定 Excel第一行为列名，即为转换后的Datatable中的DataColumn列
 16         /// </summary>
 17         /// <param name="file">Excel文件路径</param>
 18         /// <param name="sheet">sheet名称</param>
 19         /// <returns></returns>
 20         public static DataTable ExcelSheet2DataTable(string file, string sheet)
 21         {
 22             DataTable dt = null;
 23             FileInfo existingFile = new FileInfo(file);
 24             try
 25             {
 26                 ExcelPackage package = new ExcelPackage(existingFile);
 27                 int vSheetCount = package.Workbook.Worksheets.Count; //获取总Sheet页
 28 
 29                 ExcelWorksheet worksheet = package.Workbook.Worksheets[sheet];//选定 指定页
 30 
 31                 int maxColumnNum = worksheet.Dimension.End.Column;//最大列
 32                 int minColumnNum = worksheet.Dimension.Start.Column;//最小列
 33 
 34                 int maxRowNum = worksheet.Dimension.End.Row;//最小行
 35                 int minRowNum = worksheet.Dimension.Start.Row;//最大行
 36 
 37                 DataTable vTable = new DataTable();
 38                 DataColumn vC;
 39                 for (int j = 1; j <= maxColumnNum; j++)
 40                 {
 41                     string colname = worksheet.Cells[1, j].Text;
 42                     if (vTable.Columns.Contains(colname))
 43                     {
 44                         colname += "1";//对于可能的重名列的处理
 45                     }
 46                     vC = new DataColumn(colname, typeof(string));
 47 
 48                     vTable.Columns.Add(vC);
 49                 }
 50 
 51                 for (int n = 2; n <= maxRowNum; n++)
 52                 {
 53                     DataRow vRow = vTable.NewRow();
 54                     for (int m = 1; m <= maxColumnNum; m++)
 55                     {
 56                         vRow[m - 1] = worksheet.Cells[n, m].Value;
 57                     }
 58                     vTable.Rows.Add(vRow);
 59                 }
 60                 dt = vTable;
 61                 worksheet = null;
 62                 sheet = null;
 63             }
 64             catch (Exception vErr)
 65             {
 67                 try
 68                 {
 69                     using (FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read))
 70                     {
 71                         using (HSSFWorkbook workbook = new HSSFWorkbook(fs))  //根据EXCEL文件流初始化工作簿  
 72                         {
 73                             //var sheet1 = workbook.GetSheetAt(0); //获取第一个sheet  
 74                             var sheet1 = workbook.GetSheet(sheet); //获取sheet
 75                             DataTable table = new DataTable();//  
 76                             var row1 = sheet1.GetRow(0);//获取第一行即标头  
 77 
 78                             int cellCount = row1.LastCellNum; //第一行的列数  
 79                             int rowCount = sheet1.LastRowNum; //总行数  
 80 
 81                             //把第一行的数据添加到datatable的列名  
 82                             for (int i = row1.FirstCellNum; i < cellCount; i++)
 83                             {
 84                                 string colname = string.Empty;
 85                                 if (row1.GetCell(i).CellType == NPOI.SS.UserModel.CellType.STRING)
 86                                 {
 87                                     colname = row1.GetCell(i).StringCellValue;
 88                                 }                                
 89                                 else
 90                                 {
 91                                     colname = row1.GetCell(i).ToString();
 92                                 }
 93                                 if (table.Columns.Contains(colname))
 94                                 {
 95                                     colname += "1";
 96                                 }
 97                                 DataColumn column = new DataColumn(colname);
 98                                 table.Columns.Add(column);
 99                             }
100                                 //把每行数据添加到datatable中  
104                             for (int i = (sheet1.FirstRowNum + 1); i < sheet1.LastRowNum; i++)
105                             {
106                                 HSSFRow row = sheet1.GetRow(i) as HSSFRow;
107                                 DataRow dataRow = table.NewRow();
108 
109                                 for (int j = row.FirstCellNum; j < cellCount; j++)
110                                 {
111                                     if (row.GetCell(j) != null)
112                                         dataRow[j] = row.GetCell(j).ToString();
113                                 }
114 
115                                 table.Rows.Add(dataRow);
116                             }
117                             dt = table;
118                         }
119                     }
120                 }
121                 catch
122                 {
123 
124                 }
125             }
126             return dt;
127         }
128     }