C# NPOI 导入与导出Excel文档 兼容xlsx, xls

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C# NPOI 导入与导出Excel文档 兼容xlsx, xls

这里使用的NPOI版本为: 2.1.3.1

官方下载地址: 

版本内包含.Net 2.0 与.Net 4.0

.Net 4.0中包含文件

使用时需引用需要引用所有5个dll

使用到的引用

using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;

还有经过自己整理的导入导出Excel代码：

        /// <summary>/// Excel导入成Datable/// </summary>/// <param name="file">导入路径(包含文件名与扩展名)</param>/// <returns></returns>public static DataTable ExcelToTable(string file){DataTable dt = new DataTable();IWorkbook workbook;string fileExt = Path.GetExtension(file).ToLower();using (FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read)){//XSSFWorkbook 适用XLSX格式，HSSFWorkbook 适用XLS格式if (fileExt == ".xlsx") { workbook = new XSSFWorkbook(fs); } else if (fileExt == ".xls") { workbook = new HSSFWorkbook(fs); } else { workbook = null; }if (workbook == null) { return null; }ISheet sheet = workbook.GetSheetAt(0);//表头  IRow header = sheet.GetRow(sheet.FirstRowNum);List<int> columns = new List<int>();for (int i = 0; i < header.LastCellNum; i++){object obj = GetValueType(header.GetCell(i));if (obj == null || obj.ToString() == string.Empty){dt.Columns.Add(new DataColumn("Columns" + i.ToString()));}elsedt.Columns.Add(new DataColumn(obj.ToString()));columns.Add(i);}//数据  for (int i = sheet.FirstRowNum + 1; i <= sheet.LastRowNum; i++){DataRow dr = dt.NewRow();bool hasValue = false;foreach (int j in columns){dr[j] = GetValueType(sheet.GetRow(i).GetCell(j));if (dr[j] != null && dr[j].ToString() != string.Empty){hasValue = true;}}if (hasValue){dt.Rows.Add(dr);}}}return dt;}/// <summary>/// Datable导出成Excel/// </summary>/// <param name="dt"></param>/// <param name="file">导出路径(包括文件名与扩展名)</param>public static void TableToExcel(DataTable dt, string file){IWorkbook workbook;string fileExt = Path.GetExtension(file).ToLower();if (fileExt == ".xlsx") { workbook = new XSSFWorkbook(); } else if (fileExt == ".xls") { workbook = new HSSFWorkbook(); } else { workbook = null; }if (workbook == null) { return; }ISheet sheet = string.IsNullOrEmpty(dt.TableName) ? workbook.CreateSheet("Sheet1") : workbook.CreateSheet(dt.TableName);//表头  IRow row = sheet.CreateRow(0);for (int i = 0; i < dt.Columns.Count; i++){ICell cell = row.CreateCell(i);cell.SetCellValue(dt.Columns[i].ColumnName);}//数据  for (int i = 0; i < dt.Rows.Count; i++){IRow row1 = sheet.CreateRow(i + 1);for (int j = 0; j < dt.Columns.Count; j++){ICell cell = row1.CreateCell(j);cell.SetCellValue(dt.Rows[i][j].ToString());}}//转为字节数组  MemoryStream stream = new MemoryStream();workbook.Write(stream);var buf = stream.ToArray();//保存为Excel文件  using (FileStream fs = new FileStream(file, FileMode.Create, FileAccess.Write)){fs.Write(buf, 0, buf.Length);fs.Flush();}}/// <summary>/// 获取单元格类型/// </summary>/// <param name="cell"></param>/// <returns></returns>private static object GetValueType(ICell cell){if (cell == null)return null;switch (cell.CellType){case CellType.Blank: //BLANK:  return null;case CellType.Boolean: //BOOLEAN:  return cell.BooleanCellValue;case CellType.Numeric: //NUMERIC:  return cell.NumericCellValue;case CellType.String: //STRING:  return cell.StringCellValue;case CellType.Error: //ERROR:  return cell.ErrorCellValue;case CellType.Formula: //FORMULA:  default:return "=" + cell.CellFormula;}}

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