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
using System; using System.Data; using System.IO; using NPOI.SS.UserModel; using NPOI.HSSF.UserModel; using NPOI.XSSF.UserModel; using System.Collections.Generic; using System.Reflection; namespace IETMAuthor.Toolbox { 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)) { // 2003版本 if (filePath.IndexOf(".xls") > 0) workbook = new HSSFWorkbook(fs); // 2007版本 else if (filePath.IndexOf(".xlsx") > 0) workbook = new XSSFWorkbook(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 { switch (cell.CellType) { case (NPOI.SS.UserModel.CellType)CellType.Blank: dataRow[j] = ""; break; case (NPOI.SS.UserModel.CellType)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 (NPOI.SS.UserModel.CellType)CellType.String: dataRow[j] = cell.StringCellValue; break; } } } dataTable.Rows.Add(dataRow); } } } } } return dataTable; } catch (Exception) { if (fs != null) { fs.Close(); } return null; } } /// <summary> /// DataTable转List<T> /// </summary> /// <typeparam name="T">数据项类型</typeparam> /// <param name="dt">DataTable</param> /// <returns>List数据集</returns> public static List<T> DataTableToList<T>(DataTable dt) where T : new() { List<T> list = new List<T>(); if (dt != null && dt.Rows.Count > 0) { foreach (DataRow dr in dt.Rows) { T t = DataRowToModel<T>(dr); list.Add(t); } } return list; } /// <summary> /// DataRow转实体 /// </summary> /// <typeparam name="IetmDmodule">数据型类</typeparam> /// <param name="dr">DataRow</param> /// <returns>模式</returns> public static T DataRowToModel<T>(DataRow dr) where T : new() { //T t = (T)Activator.CreateInstance(typeof(T)); T t = new T(); if (dr == null) return default(T); // 获得此模型的公共属性 PropertyInfo[] propertys = t.GetType().GetProperties(); DataColumnCollection Columns = dr.Table.Columns; foreach (PropertyInfo p in propertys) { string columnName = p.Name; if (Columns.Contains(columnName)) { object value = dr[columnName]; if (value is DBNull || value == DBNull.Value) continue; try { switch (p.PropertyType.ToString()) { case "System.String": p.SetValue(t, Convert.ToString(value), null); break; case "System.Int32": p.SetValue(t, Convert.ToInt32(value), null); break; case "System.Int64": p.SetValue(t, Convert.ToInt64(value), null); break; case "System.DateTime": p.SetValue(t, Convert.ToDateTime(value), null); break; case "System.Boolean": p.SetValue(t, Convert.ToBoolean(value), null); break; case "System.Double": p.SetValue(t, Convert.ToDouble(value), null); break; case "System.Decimal": p.SetValue(t, Convert.ToDecimal(value), null); break; default: p.SetValue(t, value, null); break; } } catch (Exception ex) { continue; /*使用 default 关键字，此关键字对于引用类型会返回空，对于数值类型会返回零。对于结构， * 此关键字将返回初始化为零或空的每个结构成员，具体取决于这些结构是值类型还是引用类型*/ } } } return t; } } enum CellType { Unknown = -1, Numeric = 0, String = 1, Formula = 2, Blank = 3, Boolean = 4, Error = 5 } }
三、结果
四、写入excel类
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：
