C# NPIO导出 动态Excel2
https://blog.csdn.net/weixin_43965881/article/details/106572220
之前的动态导出，当数据大于xls的最大行数时回出现错误
我在之前的基础上进行了改进
改进的帮助类
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.SS.Util;
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Text;
using System.Web;
/// SheetColumnList)
public string Excle(string fileName, List<ExcleSheetColumnData> SheetColumnList)
{
//var newfile=filePath+fileName+".xls";导出文件路径可以作为参数传入
//设置导出文件路径
string path = HttpContext.Current.Server.MapPath("Export/");
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
//设置新建文件路径及名称
var newFile = path + fileName + ".xls";
using (var fs = new FileStream(newFile, FileMode.Create, FileAccess.Write))
{
IWorkbook workbook = new HSSFWorkbook();
#region 设置内容单元格样式 (这边的单元格样式一定要放在循环外面，否则会造成office下部分样式丢失，wps下没问题)
var style = (HSSFCellStyle)workbook.CreateCellStyle(); //创建样式
style.Alignment = HorizontalAlignment.Center; //水平居中
style.VerticalAlignment = VerticalAlignment.Center; //垂直居中
style.BorderBottom = BorderStyle.Thin;
style.BorderLeft = BorderStyle.Thin;
style.BorderRight = BorderStyle.Thin;
style.BorderTop = BorderStyle.Thin;
IFont font = workbook.CreateFont();
font.FontHeightInPoints = 12;//设置字体大小
font.FontName = "微软雅黑";//设置字体类型
font.IsBold = true;//加粗
style.SetFont(font);
var style1 = (HSSFCellStyle)workbook.CreateCellStyle(); //创建样式
style1.Alignment = HorizontalAlignment.Center; //水平居中
style1.VerticalAlignment = VerticalAlignment.Center; //垂直居中
style1.BorderBottom = BorderStyle.Thin;
style1.BorderLeft = BorderStyle.Thin;
style1.BorderRight = BorderStyle.Thin;
style1.BorderTop = BorderStyle.Thin;
IFont font1 = workbook.CreateFont();
font1.FontHeightInPoints = 12;
font1.FontName = "微软雅黑";//设置字体类型
style1.SetFont(font1);
#endregion
foreach (var SheetColumnModel in SheetColumnList)
{
List<ISheet> sheetList = new List<ISheet>();
// var sheet = workbook.CreateSheet(SheetColumnModel.sheetName);
var ColumnList = SheetColumnModel.ColumnList;//获取列表
int j = 0;
//ISheet sheet = null;
foreach (DataRow it in SheetColumnModel.DataList.Tables[0].Rows)//后缀xls，单个sheet最大行数为65335
{
int rowMax = 65335;
if (j % rowMax == 0)//是否存在余数
{
var shu = sheetList.Count == 0 ? "" : "" + sheetList.Count;
ISheet shee = workbook.CreateSheet(SheetColumnModel.sheetName + "" + shu);
//创建第一行
IRow rowColumn = (HSSFRow)shee.CreateRow(0);
//列头
for (var i = 0; i < ColumnList.Count; i++)
{
var cell = rowColumn.CreateCell(i);
cell.CellStyle = style;
cell.SetCellValue(ColumnList[i].ColumnValue);
shee.AutoSizeColumn(i);
#region 合并标题和列头单元格
//shee.AddMergedRegion(new CellRangeAddress(0, 1, i, i));
//shee.AddMergedRegion(new CellRangeAddress(1, 2, 1, 1));
//shee.AddMergedRegion(new CellRangeAddress(1, 2, 2, 2));
//shee.AddMergedRegion(new CellRangeAddress(1, 2, 3, 3));
//shee.AddMergedRegion(new CellRangeAddress(1, 1, 4, 6));
//shee.AddMergedRegion(new CellRangeAddress(1, 1, 7, 9));
//shee.AddMergedRegion(new CellRangeAddress(1, 2, 10, 10));
#endregion
}
sheetList.Add(shee);
// sheet = shee;
}
//int sheet_i = (j / 65335);
int sheet_i = sheetList.Count() - 1;
j++;
ISheet sheet = sheetList[sheet_i];//获取最后应该sheet
int rouNumber = j % rowMax;
if (rouNumber==0)
{
rouNumber = rowMax;
}
IRow row = (HSSFRow)sheet.CreateRow(rouNumber);//创建数据行
//循环填充列
for (var i = 0; i < ColumnList.Count; i++)
{
var cell = row.CreateCell(i);
cell.CellStyle = style1;
cell.SetCellValue(it[ColumnList[i].ColumnKey].ToString());
}
}
for (var i = 0; i < ColumnList.Count; i++)
{
foreach (var sheet in sheetList)
{
SelfWidth(sheet, i);
}
}
}
workbook.Write(fs);
return newFile;
}
}
//public
/// 如何使用帮助类
ExcleHelper excle = new ExcleHelper();
List<ExcleSheetColumnData> sheetColumns = new List<ExcleSheetColumnData>();
//一个excleSheet代表一个sheet
ExcleSheetColumnData excleSheet = new ExcleSheetColumnData();
excleSheet.sheetName = "第一个sheet1";
excleSheet.DataList = new AppInManager().GetDataSetAppInSum1(Bind());//当前这个sheet所展示的数据 所绑定的是一个DataSet
List<ExcleColumn> columns = new List<ExcleColumn>();
//columns.Add(new ExcleColumn() { ColumnKey = "绑定的字段名称", ColumnValue = "展示的列名" });
columns.Add(new ExcleColumn() {
ColumnKey = "Num", ColumnValue = "序号" });
columns.Add(new ExcleColumn() {
ColumnKey = "AddressType", ColumnValue = "所在镇区" });
columns.Add(new ExcleColumn() {
ColumnKey = "AppName", ColumnValue = "公司名称" });
columns.Add(new ExcleColumn() {
ColumnKey = "AppAddress", ColumnValue = "地址" });
columns.Add(new ExcleColumn() {
ColumnKey = "fa", ColumnValue = "发明数量" });
excleSheet.ColumnList = columns;
sheetColumns.Add(excleSheet);
//ExcleSheetColumnData excleSheet2 = new ExcleSheetColumnData();
//.....
//....
//sheetColumns.Add(excleSheet2);
//返回的是文档的保存的位置（路径）
string filePath = excle.Excle("有效专利汇总", sheetColumns);
OutputExcel(filePath);//下载到客户端，自己定义
注意：该帮助类只是把当前导出的数据存到该路径下了，并没有下载到客户端