using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Web;namespace MVCStudy.Helper
{public class ExcelHandle{/// <summary> /// 将DataTable数据导出到Excel文件中(xlsx) /// </summary> /// <param name="dt">数据源</param> /// <param name="excelName">文件名称</param> public static void TableToExcelForXLSX(DataTable dt, string excelName){XSSFWorkbook xssfworkbook = new XSSFWorkbook();ISheet sheet = xssfworkbook.CreateSheet("Test");//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());}}HttpContext curContext = HttpContext.Current;curContext.Response.Clear();curContext.Response.ContentType = "application/x-excel";string filename = HttpUtility.UrlEncode(excelName + DateTime.Now.ToString("yyyyMMddHHmm") + ".xlsx");curContext.Response.AddHeader("Content-Disposition", "attachment;filename=" + filename);xssfworkbook.Write(curContext.Response.OutputStream);curContext.Response.End();}/// <summary>/// 读取excel（版本不低于2007）至DataTable/// </summary>/// <param name="file"></param>/// <returns></returns>public static DataTable ExcelToTableForXLSX(string file){DataTable dt = new DataTable();using (FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read)){XSSFWorkbook xssfworkbook = new XSSFWorkbook(fs);ISheet sheet = xssfworkbook.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 = GetValueTypeForXLSX(header.GetCell(i) as XSSFCell);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] = GetValueTypeForXLSX(sheet.GetRow(i).GetCell(j) as XSSFCell);if (dr[j] != null && dr[j].ToString() != string.Empty){hasValue = true;}}if (hasValue){dt.Rows.Add(dr);}}}return dt;}/// <summary>  /// 获取单元格类型(xlsx)  /// </summary>  /// <param name="cell"></param>  /// <returns></returns>  private static object GetValueTypeForXLSX(XSSFCell 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;}}/// <summary>/// 将List导出到Excel/// </summary>/// <param name="enList">List数据</param>/// <param name="fileName">Excel文件名</param>/// <param name="sheetName">Excel工作表名</param>/// <param name="cell0Value">首行提示信息</param>public void IListToExcel( IList enList, string fileName, string sheetName,string cell0Value){IWorkbook workbook = new XSSFWorkbook();ISheet sheet = workbook.CreateSheet(sheetName);sheet.CreateRow(0).CreateCell(0).SetCellValue(cell0Value);List<string> Ihead = new List<string>();Type types = enList[0].GetType();foreach(var item in types.GetProperties()){Ihead.Add(item.Name);}IRow row1 = sheet.CreateRow(1);for (int i = 0; i < Ihead.Count; i++){row1.CreateCell(i).SetCellValue(Ihead[i]);}int rowIndex = 2;foreach (var item in enList){IRow rowTmp = sheet.CreateRow(rowIndex);for (int i = 0; i < Ihead.Count; i++){System.Reflection.PropertyInfo properotyInfo = item.GetType().GetProperty(Ihead[i]); // 属性的信息object properotyValue = properotyInfo.GetValue(item, null);// 属性的值string cellValue = properotyValue.ToString()??null;// 单元格的值
                    rowTmp.CreateCell(i).SetCellValue(cellValue);}rowIndex++;}using (FileStream file = new FileStream(fileName, FileMode.Create)){workbook.Write(file);file.Close();}}}
}