C#中NPOI操作excel之读取和写入excel数据

 http://blog.csdn.net/coderk2014/article/details/50185163

一、下载引用

下载需要引用的dll，即：NPOI.dll，NPOI.OOXML.dll，NPOI.OpenXml4Net.dll，ICSharpCode.SharpZipLib.dll（office2007版需要此dll）。

二、excel转datatable类

[csharp] view
plain copy

using System;  

using System.Data;  

using System.IO;  

using NPOI.SS.UserModel;  

using NPOI.XSSF.UserModel;  

using NPOI.HSSF.UserModel;  

  

namespace NPOIOprateExcel  

{  

    public class ExcelUtility  

    {  

        /// <summary>  

        /// 将excel导入到datatable  

        /// </summary>  

        /// <param name="filePath">excel路径</param>  

        /// <param name="isColumnName">第一行是否是列名</param>  

        /// <returns>返回datatable</returns>  

        public static DataTable ExcelToDataTable(string filePath, bool isColumnName)  

        {  

            DataTable dataTable = null;  

            FileStream fs = null;  

            DataColumn column = null;  

            DataRow dataRow = null;  

            IWorkbook workbook = null;  

            ISheet sheet = null;  

            IRow row = null;  

            ICell cell = null;  

            int startRow = 0;  

            try  

            {  

                using (fs = File.OpenRead(filePath))  

                {  

                    // 2007版本  

                    if (filePath.IndexOf(".xlsx") > 0)  

                        workbook = new XSSFWorkbook(fs);  

                    // 2003版本  

                    else if (filePath.IndexOf(".xls") > 0)  

                        workbook = new HSSFWorkbook(fs);  

  

                    if (workbook != null)  

                    {  

                        sheet = workbook.GetSheetAt(0);//读取第一个sheet，当然也可以循环读取每个sheet  

                        dataTable = new DataTable();  

                        if (sheet != null)  

                        {  

                            int rowCount = sheet.LastRowNum;//总行数  

                            if (rowCount > 0)  

                            {  

                                IRow firstRow = sheet.GetRow(0);//第一行  

                                int cellCount = firstRow.LastCellNum;//列数  

  

                                //构建datatable的列  

                                if (isColumnName)  

                                {  

                                    startRow = 1;//如果第一行是列名，则从第二行开始读取  

                                    for (int i = firstRow.FirstCellNum; i < cellCount; ++i)  

                                    {  

                                        cell = firstRow.GetCell(i);  

                                        if (cell != null)  

                                        {  

                                            if (cell.StringCellValue != null)  

                                            {  

                                                column = new DataColumn(cell.StringCellValue);  

                                                dataTable.Columns.Add(column);  

                                            }  

                                        }  

                                    }  

                                }  

                                else  

                                {  

                                    for (int i = firstRow.FirstCellNum; i < cellCount; ++i)  

                                    {  

                                        column = new DataColumn("column" + (i + 1));  

                                        dataTable.Columns.Add(column);  

                                    }  

                                }  

  

                                //填充行  

                                for (int i = startRow; i <= rowCount; ++i)  

                                {  

                                    row = sheet.GetRow(i);  

                                    if (row == null) continue;  

  

                                    dataRow = dataTable.NewRow();  

                                    for (int j = row.FirstCellNum; j < cellCount; ++j)  

                                    {  

                                        cell = row.GetCell(j);                                          

                                        if (cell == null)  

                                        {  

                                            dataRow[j] = "";  

                                        }  

                                        else  

                                        {  

                                            //CellType(Unknown = -1,Numeric = 0,String = 1,Formula = 2,Blank = 3,Boolean = 4,Error = 5,)  

                                            switch (cell.CellType)  

                                            {  

                                                case CellType.Blank:  

                                                    dataRow[j] = "";  

                                                    break;  

                                                case CellType.Numeric:  

                                                    short format = cell.CellStyle.DataFormat;  

                                                    //对时间格式（2015.12.5、2015/12/5、2015-12-5等）的处理  

                                                    if (format == 14 || format == 31 || format == 57 || format == 58)  

                                                        dataRow[j] = cell.DateCellValue;  

                                                    else  

                                                        dataRow[j] = cell.NumericCellValue;  

                                                    break;  

                                                case CellType.String:  

                                                    dataRow[j] = cell.StringCellValue;  

                                                    break;  

                                            }  

                                        }  

                                    }  

                                    dataTable.Rows.Add(dataRow);  

                                }  

                            }  

                        }  

                    }  

                }  

                return dataTable;  

            }  

            catch (Exception)  

            {  

                if (fs != null)  

                {  

                    fs.Close();  

                }  

                return null;  

            }  

        }  

    }  

}  

三、结果



四、写入excel类

[csharp] view
plain copy

public static bool DataTableToExcel(DataTable dt)  

        {  

            bool result = false;  

            IWorkbook workbook = null;  

            FileStream fs = null;  

            IRow row = null;  

            ISheet sheet = null;  

            ICell cell = null;  

            try  

            {  

                if (dt != null && dt.Rows.Count > 0)  

                {  

                    workbook = new HSSFWorkbook();  

                    sheet = workbook.CreateSheet("Sheet0");//创建一个名称为Sheet0的表  

                    int rowCount = dt.Rows.Count;//行数  

                    int columnCount = dt.Columns.Count;//列数  

  

                    //设置列头  

                    row = sheet.CreateRow(0);//excel第一行设为列头  

                    for (int c = 0; c < columnCount; c++)  

                    {  

                        cell = row.CreateCell(c);  

                        cell.SetCellValue(dt.Columns[c].ColumnName);  

                    }                      

  

                    //设置每行每列的单元格,  

                    for (int i = 0; i <rowCount; i++)  

                    {  

                        row = sheet.CreateRow(i+1);  

                        for (int j = 0; j < columnCount; j++)  

                        {                              

                            cell = row.CreateCell(j);//excel第二行开始写入数据  

                            cell.SetCellValue(dt.Rows[i][j].ToString());                              

                        }  

                    }  

                    using (fs = File.OpenWrite(@"D:/myxls.xls"))   

                    {  

                        workbook.Write(fs);//向打开的这个xls文件中写入数据  

                        result = true;  

                    }  

                }  

                return result;  

            }  

            catch (Exception ex)  

            {  

                if (fs != null)  

                {  

                    fs.Close();  

                }  

                return false;  

            }  

        }  

结果如下：



源码地址：http://download.csdn.net/detail/coderk2014/9328779