在项目中使用Npoi导出到Excel

//调用Npoi实现导出Excel的功能

private void btnExportToExcel_Click(object sender, RoutedEventArgs e)

{

SaveFileDialog sdfExport = new SaveFileDialog();

sdfExport.Filter = "Excel文件|*.xls";//设定通用对话框的过滤关键词

if (sdfExport.ShowDialog() != true)

{

return;

}

string filename = sdfExport.FileName;

HSSFWorkbook workbook = new HSSFWorkbook();

ISheet sheet = workbook.CreateSheet("员工数据");

IRow rowHeader = sheet.CreateRow(0);//表头行,在表头下面创建三个头字段

rowHeader.CreateCell(0, CellType.STRING).SetCellValue("姓名");

rowHeader.CreateCell(1, CellType.STRING).SetCellValue("工号");

rowHeader.CreateCell(2, CellType.STRING).SetCellValue("入职日期");

//把查询结果导出到Excel

Employee[] employees = (Employee[])datagrid.ItemsSource;//得到GridView的绑定数据源，数据源是一个员工类数组

for (int i = 0; i < employees.Length; i++)//遍历员工类

{

Employee employee = employees[i]; //得到其中第i个员工对象

IRow row = sheet.CreateRow(i + 1); //创建第i+1行

row.CreateCell(0, CellType.STRING).SetCellValue(employee.Name); //设置行数据

row.CreateCell(1, CellType.STRING).SetCellValue(employee.Number); //设置行数据

ICellStyle styledate = workbook.CreateCellStyle();

IDataFormat format = workbook.CreateDataFormat();

//格式具体有哪些请看单元格右键中的格式，有说明，excel中的日期类型是使用数字来显示的

styledate.DataFormat = format.GetFormat("yyyy\"年\"m\"月\"d\"日\"");

ICell cellInDate = row.CreateCell(2, CellType.NUMERIC);

cellInDate.CellStyle = styledate;

cellInDate.SetCellValue(employee.InDate);

}

using (Stream stream = File.OpenWrite(filename))

{

workbook.Write(stream);

}

}