NPOI是指构建在POI 3.x版本之上的一个程序，NPOI可以在没有安装Office的情况下对Word或Excel文档进行读写操作。 NPOI是一个开源的C#读写Excel、WORD等微软OLE2组件文档的项目。
以下代码主要分3部分：通过实体类的自定义特性导出Excel文件
1、封装类：ExcelHelper
2、实体类：StudentModel
3、调用：Form1
ExcelHelper
/// <summary>
/// Excel操作类
/// </summary>
/// <typeparam name="T">实体类</typeparam>
public class ExcelHelper<T> where T : class
{
/// <summary>
/// 保存Excel文件
/// </summary>
/// <param name="excelName">Excel文件名</param>
/// <param name="sheetName">Sheet工作表名</param>
/// <param name="data">实体类对象</param>
public static void SaveExcelFile(string excelName, string sheetName, List<T> data)
{
IWorkbook workBook = new HSSFWorkbook(); //创建一个Excel文档
ISheet sheet = workBook.CreateSheet(sheetName); //创建一个工作表Sheet
int rowNum = 0;
var row = sheet.CreateRow(sheet.LastRowNum); //LastRowNum记录当前可用写入的行索引
PropertyInfo[] preInfo = typeof(T).GetProperties();//获取这个实体对象的所有属性
foreach (var item in preInfo)
{
object[] objPres = item.GetCustomAttributes(typeof(DescriptionAttribute), true);//获取当前属性的自定义特性列表
if (objPres.Length > 0)
{
for (int i = 0; i < objPres.Length; i++)
{
row.CreateCell(rowNum).SetCellValue(((DescriptionAttribute)objPres[i]).Description);//创建行，将当前自定义特性写入
rowNum++;//行索引加1，下次往后一格创建行
}
}
}
int j = sheet.LastRowNum + 1, columnNum = 0;
foreach (var item in data)
{
columnNum = 0;
row = sheet.CreateRow(j++);
var itemProps = item.GetType().GetProperties(); //获取当前对象的属性列表
foreach (var itemPropSub in itemProps)
{
//获取当前对象特性中的自定义特性[Description("自定义特性")]
var objs = itemPropSub.GetCustomAttributes(typeof(DescriptionAttribute), true);
if (objs.Length > 0)
{
//将当前对象的特性值，插入当前行的第n列单元格
row.CreateCell(columnNum).SetCellValue(itemPropSub.GetValue(item, null) == null ? "" : itemPropSub.GetValue(item, null).ToString());
columnNum++;
}
}
}
//文件流写入
using (MemoryStream ms = new MemoryStream())
{
workBook.Write(ms);
using (FileStream fs = new FileStream(excelName, FileMode.Create, FileAccess.Write))
{
ms.WriteTo(fs);
}
ms.Flush();
ms.Position = 0;
workBook.Close();
}
}
}StudentModel
//实体类
public class StudentModel
{
[Description("学号")]
public string ID { get; set; }
[Description("姓名")]
public string Name { get; set; }
[Description("年龄")]
public string Age { get; set; }
[Description("性别")]
public string Six { get; set; }
[Description("地址")]
public string Address { get; set; }
[Description("电话")]
public string Tel { get; set; }
}调用：
List<StudentModel> stdList = new List<StudentModel>();
stdList.Add(new StudentModel() { ID = "001", Name = "Peter", Age = "26", Six = "男", Address = "东京", Tel = "123456789" });
stdList.Add(new StudentModel() { ID = "002", Name = "Jerry", Age = "36", Six = "男", Address = "首尔", Tel = "987654321" });
ExcelHelper<StudentModel>.SaveExcelFile(Application.StartupPath + "\\StudentInfo.xls", "Student", stdList);结果：
