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ExcelHelper

读取excel用三种方式,在这里只介绍用NOPI读取的方式,非常简单好用。如果您需要了解其他两种方式,请异步到此处。所有代码经过测试有效,下面做简要介绍:

功能:

  1. datatable ----->   excel
  2. excel       ----->   datatable
  3. 获取excel所有表名
  4. 获取指定位置的单元格数据(string类型,输入坐标时请将xy减一)

第一步:

下载并引用NOPI

第二步

创建类,代码如下:

using System;using System.Collections.Generic;using System.Linq;using System.Text;using NPOI.SS.UserModel;using NPOI.XSSF.UserModel;using NPOI.HSSF.UserModel;using System.IO;using System.Data;namespace excelToMdb{    public class ExcelHelper : IDisposable    {        private string fileName = null; //文件名        private IWorkbook workbook = null;        private FileStream fs = null;        private bool disposed;        public ExcelHelper(string fileName)        {            this.fileName = fileName;            disposed = false;        }        /// <summary>        /// 将DataTable数据导入到excel中        /// </summary>        /// <param name="data">要导入的数据</param>        /// <param name="isColumnWritten">DataTable的列名是否要导入</param>        /// <param name="sheetName">要导入的excel的sheet的名称</param>        /// <returns>导入数据行数(包含列名那一行)</returns>        public int DataTableToExcel(DataTable data, string sheetName, bool isColumnWritten)        {            int i = 0;            int j = 0;            int count = 0;            ISheet sheet = null;            fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.ReadWrite);            if (fileName.IndexOf(".xlsx") > 0) // 2007版本                workbook = new XSSFWorkbook();            else if (fileName.IndexOf(".xls") > 0) // 2003版本                workbook = new HSSFWorkbook();            try            {                if (workbook != null)                {                    sheet = workbook.CreateSheet(sheetName);                }                else                {                    return -1;                }                if (isColumnWritten == true) //写入DataTable的列名                {                    IRow row = sheet.CreateRow(0);                    for (j = 0; j < data.Columns.Count; ++j)                    {                        row.CreateCell(j).SetCellValue(data.Columns[j].ColumnName);                    }                    count = 1;                }                else                {                    count = 0;                }                for (i = 0; i < data.Rows.Count; ++i)                {                    IRow row = sheet.CreateRow(count);                    for (j = 0; j < data.Columns.Count; ++j)                    {                        row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString());                    }                    ++count;                }                workbook.Write(fs); //写入到excel                return count;            }            catch (Exception ex)            {                Console.WriteLine("Exception: " + ex.Message);                return -1;            }        }        /// <summary>        /// 将excel中的数据导入到DataTable中        /// </summary>        /// <param name="sheetName">excel工作薄sheet的名称,为null时返回第一个表格</param>        /// <param name="isFirstRowColumn">第一行是否是DataTable的列名</param>        /// <returns>返回的DataTable</returns>        public DataTable ExcelToDataTable(string sheetName, bool isFirstRowColumn, int startRow = 0)        {            ISheet sheet = null;            DataTable data = new DataTable();            try            {                fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);                if (fileName.IndexOf(".xlsx") > 0) // 2007版本                    workbook = new XSSFWorkbook(fs);                else if (fileName.IndexOf(".xls") > 0) // 2003版本                    workbook = new HSSFWorkbook(fs);                if (sheetName != null)                {                    sheet = workbook.GetSheet(sheetName);                    if (sheet == null) //如果没有找到指定的sheetName对应的sheet,则尝试获取第一个sheet                    {                        return data;                    }                }                else                {                    sheet = workbook.GetSheetAt(0);                }                if (sheet != null)                {                    IRow firstRow = sheet.GetRow(startRow);                    int cellCount = firstRow.LastCellNum; //一行最后一个cell的编号 即总的列数                    if (isFirstRowColumn)                    {                        for (int i = firstRow.FirstCellNum; i < cellCount; ++i)                        {                            ICell cell = firstRow.GetCell(i);                            if (cell != null)                            {                                string cellValue =http://www.mamicode.com/ cell.StringCellValue;                                if (cellValue != null)                                {                                    DataColumn column = new DataColumn(cellValue);                                    data.Columns.Add(column);                                }                            }                        }                        startRow = sheet.FirstRowNum + 1;                    }                    else                    {                        for (int i = 0; i < cellCount; ++i)                        {                            DataColumn column = new DataColumn(i.ToString());                            data.Columns.Add(column);                        }                        startRow = sheet.FirstRowNum;                    }                    //最后一列的标号                    int rowCount = sheet.LastRowNum;                    for (int i = startRow; i <= rowCount; ++i)                    {                        IRow row = sheet.GetRow(i);                        if (row == null) continue; //没有数据的行默认是null                               DataRow dataRow = data.NewRow();                        for (int j = row.FirstCellNum; j < cellCount; ++j)                        {                            if (row.GetCell(j) != null) //同理,没有数据的单元格都默认是null                                dataRow[j] = row.GetCell(j).ToString();                        }                        data.Rows.Add(dataRow);                    }                }                return data;            }            catch (Exception ex)            {                Console.WriteLine("Exception: " + ex.Message);                return null;            }        }        public void Dispose()        {            Dispose(true);            GC.SuppressFinalize(this);        }        protected virtual void Dispose(bool disposing)        {            if (!this.disposed)            {                if (disposing)                {                    if (fs != null)                        fs.Close();                }                fs = null;                disposed = true;            }        }        /// <summary>        /// 获取所有表名        /// </summary>        /// <returns></returns>        public List<string> GetSheets()        {            List<string> sheetsNameList = new List<string>();            ISheet sheet = null;            int startRow = 0;            try            {                fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);                if (fileName.IndexOf(".xlsx") > 0) // 2007版本                    workbook = new XSSFWorkbook(fs);                else if (fileName.IndexOf(".xls") > 0) // 2003版本                    workbook = new HSSFWorkbook(fs);                for (int i = 0; i < workbook.NumberOfSheets; i++)                {                    sheetsNameList.Add(workbook.GetSheetName(i));                }                return sheetsNameList;            }            catch (Exception ex)            {                Console.WriteLine("Exception: " + ex.Message);                return null;            }        }        public string GetCell(string sheetName, int rowNum, int columnNum)        {            ISheet sheet = null;            DataTable data = new DataTable();            try            {                fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);                if (fileName.IndexOf(".xlsx") > 0) // 2007版本                    workbook = new XSSFWorkbook(fs);                else if (fileName.IndexOf(".xls") > 0) // 2003版本                    workbook = new HSSFWorkbook(fs);                if (sheetName != null)                {                    sheet = workbook.GetSheet(sheetName);                    if (sheet == null) //如果没有找到指定的sheetName对应的sheet,则尝试获取第一个sheet                    {                        sheet = workbook.GetSheetAt(0);                    }                }                else                {                    sheet = workbook.GetSheetAt(0);                }                if (sheet != null)                {                    return sheet.GetRow(rowNum).GetCell(columnNum).ToString();                }                return "";            }            catch (Exception ex)            {                Console.WriteLine("Exception: " + ex.Message);                return null;            }        }    }}

然后直接引用即可

 

ExcelHelper