NPOI 导出Excel
NPOI是一个用于处理Office文档的开源项目。它是用C#编写的，允许开发人员在.NET平台上读取、写入和操作Word、Excel和PowerPoint文件。NPOI提供了一组API，使开发人员能够以编程方式创建、修改和处理Office文档，这对于自动化生成报表、导出数据等任务非常有用。NPOI是一个非营利性的开源项目，旨在为开发人员提供处理Office文档的免费解决方案。
引用NPOI2.5.5
导出工具类库
using System;
using System.Data;
using System.IO;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using Serenity.ComponentModel;
using System.Linq;
using System.Reflection;
using NPOI.XSSF.UserModel;//NPOI2.0
using NPOI.SS.UserModel;
using NPOI.HSSF.Util;
///
/// NPOI导出Excel
///
namespace NDPS.Code
{
public class ExcelExportHelp
{
XSSFWorkbook hssfworkbook;//2.0
public ExcelExportHelp()
{
hssfworkbook = new XSSFWorkbook();
}
#region HSSFWorkbook
///
/// List 数据写入Excel Sheet
///
/// 数据模型实体
/// 数据列表
/// Excel表格名称
public void GenerateData(IEnumerable list, string sheetName)
{
DataTable dt = ListToDataTable(list);
List columnWiths = new List();//列宽
List headColumnName = new List();//Excel列名
List dataColumnFieldName = new List();//数据字段名
var props = typeof(T).GetProperties();
foreach (var item in props)
{
string fieldENName = item.Name;//列英文字段名称
string fieldCNName = item.Name;//列中文字段名称
int colWidth = 15;//列宽 默认15
DescriptionAttribute customAttribute = (DescriptionAttribute)Attribute.GetCustomAttribute(item, typeof(DescriptionAttribute));
if (customAttribute != null)
{
fieldCNName = customAttribute.Description;
}
WidthAttribute widthAttribute = (WidthAttribute)Attribute.GetCustomAttribute(item, typeof(WidthAttribute));
if (widthAttribute != null)
{
colWidth = widthAttribute.Value;
}
headColumnName.Add(fieldCNName);
dataColumnFieldName.Add(fieldENName);
columnWiths.Add(colWidth);
}
ISheet sheet1 = hssfworkbook.CreateSheet(sheetName);
AddMergedRegion(sheet1);
SetHead(sheet1);
SetColumnWidth(sheet1, columnWiths);
LoadData(dt, headColumnName, dataColumnFieldName, sheet1, StyleBorderBg(), StyleBorder());
}
public MemoryStream WriteToStream()
{
//Write the stream data of workbook to the root directory
MemoryStream msData = new MemoryStream();
hssfworkbook.Write(msData);
return msData;
}
///
/// 将数据写入Excel文件
///
/// 工作簿
/// 文件导出路径
public void WirteToFile(string exportPath)
{
FileStream file = null;
try
{
file = new FileStream(exportPath, FileMode.Create);
hssfworkbook.Write(file);
}
catch (Exception e)
{
throw e;
}
finally
{
file.Dispose();
hssfworkbook.Close();
}
}
private void AddMergedRegion(ISheet sheet1)
{
//sheet1.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(0, 0, 0, 7));
}
private void SetHead(ISheet sheet1)
{
//IFont font1 = hssfworkbook.CreateFont();
//font1.Color = HSSFColor.DarkBlue.Index;
//font1.FontHeightInPoints = 16;
//ICellStyle style1 = hssfworkbook.CreateCellStyle();
//style1.SetFont(font1);
//style1.Alignment = HorizontalAlignment.Center;
//IRow row0 = sheet1.CreateRow(0);
//row0.CreateCell(0).SetCellValue("");
//row0.Cells[0].CellStyle = style1;
//InsertPic(sheet1, "listLogo.jpg", 0, 0, 0, 0);
//row0.Height = 20 * 20;
}
private void SetColumnWidth(ISheet sheet1, List columnWiths)
{
for (int i = 0; i < columnWiths.Count; i++)
{
sheet1.SetColumnWidth(i, columnWiths[i] * 256);
}
}
private void LoadData(DataTable dt, List headColumnName, List dataColumnFieldName, ISheet sheet1, ICellStyle styleBorderBg, ICellStyle styleBorder)
{
IRow row1 = sheet1.CreateRow(0);
for (int i = 0; i < headColumnName.Count; i++)
{
row1.CreateCell(i).SetCellValue(headColumnName[i]);
row1.Cells[i].CellStyle = styleBorderBg;
}
for (int i = 0; i < dt.Rows.Count; i++)
{
IRow arow = sheet1.CreateRow(i + 1);
DataRow dataRow = dt.Rows[i];
for (int j = 0; j < dataColumnFieldName.Count; j++)
{
if (String.IsNullOrEmpty(dataColumnFieldName[j]))
{
arow.CreateCell(j).SetCellValue("");
}
else
{
arow.CreateCell(j).SetCellValue(dataRow[dataColumnFieldName[j]].ToString());
//Attments
/* if (dataColumnFieldName[j] == "Attments"){
XSSFHyperlink link = new XSSFHyperlink(HyperlinkType.Url);//建一个HSSFHyperlink实体，指明链接类型为URL（这里是枚举，可以根据需求自行更改）
//link.Address = "http://blog.csdn.net/shiershilian";//给HSSFHyperlink的地址赋值
link.Address = dataRow[dataColumnFieldName[j]].ToString();
arow.CreateCell(j).Hyperlink = link;//将链接方式赋值给单元格的Hyperlink即可将链接附加到单元格上
}*/
}
arow.Cells[j].CellStyle = styleBorderBg;
}
}
}
private ICellStyle StyleBorderBg()
{
ICellStyle styleBorderBg = hssfworkbook.CreateCellStyle();
//styleBorderBg.BorderBottom = NPOI.SS.UserModel.BorderStyle.THIN;
//styleBorderBg.BottomBorderColor = HSSFColor.BLACK.index;
//styleBorderBg.BorderLeft = NPOI.SS.UserModel.BorderStyle.THIN;
//styleBorderBg.LeftBorderColor = HSSFColor.BLACK.index;
//styleBorderBg.BorderRight = NPOI.SS.UserModel.BorderStyle.THIN;
//styleBorderBg.RightBorderColor = HSSFColor.BLACK.index;
//styleBorderBg.BorderTop = NPOI.SS.UserModel.BorderStyle.THIN;
//styleBorderBg.TopBorderColor = HSSFColor.BLACK.index;
//styleBorderBg.FillForegroundColor = NPOI.HSSF.Util.HSSFColor.LIME.index;
//styleBorderBg.FillPattern = FillPatternType.LESS_DOTS;
//styleBorderBg.FillBackgroundColor = NPOI.HSSF.Util.HSSFColor.BLACK.index;
return styleBorderBg;
}
private ICellStyle StyleBorder()
{
ICellStyle styleBorder = hssfworkbook.CreateCellStyle();
styleBorder.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;
styleBorder.BottomBorderColor = HSSFColor.Black.Index;
styleBorder.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;
styleBorder.LeftBorderColor = HSSFColor.Black.Index;
styleBorder.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;
styleBorder.RightBorderColor = HSSFColor.Black.Index;
styleBorder.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;
styleBorder.TopBorderColor = HSSFColor.Black.Index;
return styleBorder;
}
public void InitializeWorkbook()
{
hssfworkbook = new XSSFWorkbook();//2.0
//create a entry of DocumentSummaryInformation
//DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
//dsi.Company = "";
//hssfworkbook.DocumentSummaryInformation = dsi;
//create a entry of SummaryInformation
//SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
//si.Subject = "";
//hssfworkbook.SummaryInformation = si;
}
#endregion
#region Other Method
public DataTable ListToDataTable(IEnumerable collection)
{
var props = typeof(T).GetProperties();
var dt = new DataTable();
foreach (var item in props)
{
//解决DataSet不支持System.Nullable<>问题
Type colType = item.PropertyType;
if ((colType.IsGenericType) && (colType.GetGenericTypeDefinition() == typeof(Nullable<>)))
{
colType = colType.GetGenericArguments()[0];
}
//添加列明及对应类型
dt.Columns.Add(item.Name, colType);
}
if (collection.Count() > 0)
{
for (int i = 0; i < collection.Count(); i++)
{
ArrayList tempList = new ArrayList();
foreach (PropertyInfo pi in props)
{
object obj = pi.GetValue(collection.ElementAt(i), null);
tempList.Add(obj);
}
object[] array = tempList.ToArray();
dt.LoadDataRow(array, true);
}
}
return dt;
}
#endregion
}
}
实体类ExportEntity
using System.ComponentModel;
using Serenity.ComponentModel;
namespace NDPS.Domain
{
public class ExportEntity
{
[DescriptionAttribute("订单编号"),Width(15)]//列名称和列宽
public string ordernum { get; set; }
[DescriptionAttribute("创建时间")]
public string addtime { get; set; }
}
}
调用代码
注意导出Excel的列名是根据实体类的字段来的。
var list = await _service.GetList();//获取业务数据 该行代码需要自行修改
string fileName = "信息列表.xlsx";
string sheetName = "信息表";
ExcelExportHelp exportHP = new ExcelExportHelp();
exportHP.GenerateData(list, sheetName);
return File(exportHP.WriteToStream().ToArray(), "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", fileName); 总结
以上代码已经在多个生产项目中成功使用，导出稳定，Window和Linux操作系统均可稳定运行。