C# Excel 读取为Datatable

最近项目用到的读取Excel 为DataTable 兼容2003、2007、2010。记录一下,以后会用到

引用 NPOI.dll 和 EPPlus.dll

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Data;
 using OfficeOpenXml;
 using System.IO;
 using NPOI.SS.UserModel;
 using NPOI.HSSF.Util;
 using NPOI.HSSF.UserModel;

 public class ExcelUtil
     {
         /// <summary>
         /// Excel 转 DataTable 约定 Excel第一行为列名，即为转换后的Datatable中的DataColumn列
         /// </summary>
         /// <param name="file">Excel文件路径</param>
         /// <param name="sheet">sheet名称</param>
         /// <returns></returns>
         public static DataTable ExcelSheet2DataTable(string file, string sheet)
         {
             DataTable dt = null;
             FileInfo existingFile = new FileInfo(file);
             try
             {
                 ExcelPackage package = new ExcelPackage(existingFile);
                 int vSheetCount = package.Workbook.Worksheets.Count; //获取总Sheet页

                 ExcelWorksheet worksheet = package.Workbook.Worksheets[sheet];//选定 指定页

                 int maxColumnNum = worksheet.Dimension.End.Column;//最大列
                 int minColumnNum = worksheet.Dimension.Start.Column;//最小列

                 int maxRowNum = worksheet.Dimension.End.Row;//最小行
                 int minRowNum = worksheet.Dimension.Start.Row;//最大行

                 DataTable vTable = new DataTable();
                 DataColumn vC;
                 for (int j = ; j <= maxColumnNum; j++)
                 {
                     string colname = worksheet.Cells[, j].Text;
                     if (vTable.Columns.Contains(colname))
                     {
                         colname += "";//对于可能的重名列的处理
                     }
                     vC = new DataColumn(colname, typeof(string));

                     vTable.Columns.Add(vC);
                 }

                 for (int n = ; n <= maxRowNum; n++)
                 {
                     DataRow vRow = vTable.NewRow();
                     for (int m = ; m <= maxColumnNum; m++)
                     {
                         vRow[m - ] = worksheet.Cells[n, m].Value;
                     }
                     vTable.Rows.Add(vRow);
                 }
                 dt = vTable;
                 worksheet = null;
                 sheet = null;
             }
             catch (Exception vErr)
             {
                 try
                 {
                     using (FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read))
                     {
                         using (HSSFWorkbook workbook = new HSSFWorkbook(fs))  //根据EXCEL文件流初始化工作簿
                         {
                             //var sheet1 = workbook.GetSheetAt(0); //获取第一个sheet
                             var sheet1 = workbook.GetSheet(sheet); //获取sheet
                             DataTable table = new DataTable();//
                             var row1 = sheet1.GetRow();//获取第一行即标头  

                             int cellCount = row1.LastCellNum; //第一行的列数
                             int rowCount = sheet1.LastRowNum; //总行数  

                             //把第一行的数据添加到datatable的列名
                             for (int i = row1.FirstCellNum; i < cellCount; i++)
                             {
                                 string colname = string.Empty;
                                 if (row1.GetCell(i).CellType == NPOI.SS.UserModel.CellType.STRING)
                                 {
                                     colname = row1.GetCell(i).StringCellValue;
                                 }
                                 else
                                 {
                                     colname = row1.GetCell(i).ToString();
                                 }
                                 if (table.Columns.Contains(colname))
                                 {
                                     colname += "";
                                 }
                                 DataColumn column = new DataColumn(colname);
                                 table.Columns.Add(column);
                             }
                                 //把每行数据添加到datatable中
                             for (int i = (sheet1.FirstRowNum + ); i < sheet1.LastRowNum; i++)
                             {
                                 HSSFRow row = sheet1.GetRow(i) as HSSFRow;
                                 DataRow dataRow = table.NewRow();

                                 for (int j = row.FirstCellNum; j < cellCount; j++)
                                 {
                                     if (row.GetCell(j) != null)
                                         dataRow[j] = row.GetCell(j).ToString();
                                 }

                                 table.Rows.Add(dataRow);
                             }
                             dt = table;
                         }
                     }
                 }
                 catch
                 {

                 }
             }
             return dt;
         }
     }