外部读取Excel的两种方法

1、使用Epplus读取

     下载地址为https://epplus.codeplex.com/,下载文件后引用Epplus.dll文件。

     这个类库读取Excel方便快捷,但是它只能读取.xlsx类型的文件,不支持.xls,具体代码如下:

 static void Main(string[] args)
        {
            //获取excel文件
            var file = new FileInfo(@"D:\a.xlsx");
            DataTable dt = null;
            using (var package = new ExcelPackage(file))
            {
                //获取workbook
                ExcelWorkbook workbook = package.Workbook;
                if (workbook != null)
                {
                    if (workbook.Worksheets.Count > 0)
                    {
                        //获取workbook的第一个worksheet
                        ExcelWorksheet worksheet = workbook.Worksheets.First();
                        //将worksheet转成datatable
                        dt = WorksheetToTable(worksheet);
                    }
                }
            }

            if (dt != null)
            {
                Console.WriteLine(dt.Rows.Count);
                Console.WriteLine(dt.Columns.Count);
            }
            Console.ReadLine();
        }

        /// <summary>
        /// 将worksheet转成datatable
        /// </summary>
        /// <param name="worksheet">待处理的worksheet</param>
        /// <returns>返回处理后的datatable</returns>
        private static DataTable WorksheetToTable(ExcelWorksheet worksheet)
        {
            //获取worksheet的行数
            int rows = worksheet.Dimension.End.Row;
            //获取worksheet的列数
            int cols = worksheet.Dimension.End.Column;

            DataTable dt = new DataTable(worksheet.Name);
            DataRow dr = null;
            for (int i = 1; i <= rows; i++)
            {
                if (i > 1)
                {
                    dr = dt.Rows.Add();
                }

                for (int j = 1; j <= cols; j++)
                {
                    //默认将第一行设置为datatable的标题
                    if (i == 1)
                    {
                        dt.Columns.Add(worksheet.Cells[i, j].Value.ToString());
                    }
                    //剩下的写入datatable
                    else
                    {
                        dr[j - 1] = worksheet.Cells[i, j].Value.ToString();
                    }
                }
            }
            return dt;
        }
View Code

2、使用NPOI读取

    下载地址为https://github.com/tonyqus/npoi,下载文件后引用

     这个可以读取.xlsx文件,也能读取.xls文件,具体代码如下:

using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System.Data;
using System.IO;

namespace NpoiReadExcel
{
    class ExceHelper
    {
        public static DataTable ExcelToTable(string fileName)
        {
            DataTable dt = new DataTable();

            //将文件转换成stream
            using (FileStream fileStream = new FileStream(fileName, FileMode.OpenOrCreate))
            {
                //根据不同版本创建不同的workbook
                IWorkbook workbook;
                if (fileName.Contains(".xlsx"))
                {
                    //针对07及以上(.xlsx文件)
                    workbook = new XSSFWorkbook(fileStream);
                }
                else
                {
                    //针对03(.xls文件)
                    workbook = new HSSFWorkbook(fileStream);
                }

                //获取第一个sheet
                ISheet sheet = workbook.GetSheetAt(0);
                //获取sheet的第一行
                IRow firstRow = sheet.GetRow(0);
                //获取sheet的列数
                int cellCount = firstRow.LastCellNum;
                //第一行作为标题加到datatable中
                for (int i = firstRow.FirstCellNum; i < cellCount; i++)
                {
                    DataColumn column = new DataColumn(firstRow.GetCell(i).StringCellValue);
                    dt.Columns.Add(column);
                }

                //sheet的行数(这里获取的行数是去除首行的行数)
                int rowCount = sheet.LastRowNum;
                for (int i = (sheet.FirstRowNum + 1); i <= rowCount; i++)
                {
                    //获取sheet的行数据
                    IRow row = sheet.GetRow(i);
                    //因为没有数据的行默认是null,去除空数据
                    if (row == null)
                    {
                        continue;
                    }

                    DataRow dataRow = dt.NewRow();
                    for (int j = row.FirstCellNum; j < cellCount; j++)
                    {
                        //没有数据的单元格默认是null,去除
                        if (row.GetCell(j) != null)
                        {
                            dataRow[j] = row.GetCell(j).ToString();
                        }
                    }
                    dt.Rows.Add(dataRow);
                }
            }
            return dt;
        }
    }
}
View Code

 

     

     

posted @ 2014-10-28 09:52  Wico  阅读(1989)  评论(0编辑  收藏  举报