最近在工作中碰到許多地方需要將各種類型的集合對(duì)象導(dǎo)出到EXCEL中，之前在網(wǎng)上找了NOPI的EXCEL導(dǎo)出工具類，都是將datatable數(shù)據(jù)導(dǎo)出成excel。但我們這里的數(shù)據(jù)都是通過對(duì)象返回的。于是對(duì)工具類進(jìn)行了改寫，使用反射讀取到集合類中的屬性和數(shù)據(jù)，可實(shí)現(xiàn)直接從集合類中導(dǎo)出數(shù)據(jù)到excel。廢話不多說，貼代碼：
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Reflection;
using System.IO;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
public class ExcelHelper<T>
{
/// <summary>
/// 泛型集合類導(dǎo)出成excel
/// </summary>
/// <param name="list">泛型集合類</param>
/// <param name="fileName">生成的excel文件名</param>
/// <param name="propertyName">excel的字段列表</param>
public static void ListToExcel(IList<T> list, string fileName, params string[] propertyName)
{
HttpContext.Current.Response.ContentType = "application/vnd.ms-excel;charset=UTF-8";
HttpContext.Current.Response.AddHeader("Content-Disposition", string.Format("attachment;filename={0}", fileName));
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.BinaryWrite(ListToExcel<T>(list, propertyName).GetBuffer());
HttpContext.Current.Response.End();
}
public static MemoryStream ListToExcel<T>(IList<T> list, params string[] propertyName)
{
//創(chuàng)建流對(duì)象
using (MemoryStream ms = new MemoryStream())
{
//將參數(shù)寫入到一個(gè)臨時(shí)集合中
List<string> propertyNameList = new List<string>();
if (propertyName != null)
propertyNameList.AddRange(propertyName);
//床NOPI的相關(guān)對(duì)象
IWorkbook workbook = new HSSFWorkbook();
ISheet sheet = workbook.CreateSheet();
IRow headerRow = sheet.CreateRow(0);
if (list.Count > 0)
{
//通過反射得到對(duì)象的屬性集合
PropertyInfo[] propertys = list[0].GetType().GetProperties();
//遍歷屬性集合生成excel的表頭標(biāo)題
for (int i=0;i<propertys.Count();i++)
{
//判斷此屬性是否是用戶定義屬性
if (propertyNameList.Count == 0)
{
headerRow.CreateCell(i).SetCellValue(propertys[i].Name);
}
else
{
if (propertyNameList.Contains(propertys[i].Name))
headerRow.CreateCell(i).SetCellValue(propertys[i].Name);
}
}
int rowIndex = 1;
//遍歷集合生成excel的行集數(shù)據(jù)
for (int i = 0; i < list.Count; i++)
{
IRow dataRow = sheet.CreateRow(rowIndex);
for (int j = 0; j < propertys.Count(); j++)
{
if (propertyNameList.Count == 0)
{
object obj = propertys[j].GetValue(list[i], null);
dataRow.CreateCell(j).SetCellValue(obj.ToString());
}
else
{
if (propertyNameList.Contains(propertys[j].Name))
{
object obj = propertys[j].GetValue(list[i], null);
dataRow.CreateCell(j).SetCellValue(obj.ToString());
}
}
}
rowIndex++;
}
}
workbook.Write(ms);
ms.Flush();
ms.Position = 0;
return ms;
}
}
}
使用時(shí)只需調(diào)用 ListToExcel方法即可，例如：
string[] propertyName =new string[]{"id","name","content"};
ExcelHelper<dictionaryInfo>.ListToExcel(di, "result", propertyName);
但是有一個(gè)小問題，生成的excel中總是從第2列開始，第1列是空的，還沒找到原因。請(qǐng)各位大大給看看。
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