使用web API和NPOI导出Excel

使用MVC controller输出excel的例子，自不待言，例子满天飞。

由于本项目使用的是Asp.net MVC API，因此在本项目使用API，实现了文件下载功能。代码的原理很简单，基本上是老外的代码。只是修改了一部分，以使其代码能正常工作（原代码输出的excel是空的）。以下是核心代码：

HSSFWorkbook workbook = new HSSFWorkbook();
ISheet sheet = workbook.CreateSheet("sheet1");

IRow row = sheet.CreateRow(0);
row.CreateCell(0).SetCellValue("教师姓名");
row.CreateCell(1).SetCellValue("学校");
row.CreateCell(2).SetCellValue("年级平均分");
row.CreateCell(3).SetCellValue("年级最高分");
row.CreateCell(4).SetCellValue("年级最低分");
row.CreateCell(5).SetCellValue("全市所处名次");

sheet.SetColumnWidth(1, 5000);
sheet.SetColumnWidth(2, 5000);
sheet.SetColumnWidth(3, 5000);
sheet.SetColumnWidth(4, 5000);
sheet.SetColumnWidth(5, 5000);

for (var i = 0; i < list.Count; i++)
{
IRow row1 = sheet.CreateRow(i + 1);
row1.CreateCell(0).SetCellValue(list[i].XM);
row1.CreateCell(1).SetCellValue(list[i].XXMC);
row1.CreateCell(2).SetCellValue(list[i].AVGScore.ToFloat());
row1.CreateCell(3).SetCellValue(list[i].MaxScore.ToFloat());
row1.CreateCell(4).SetCellValue(list[i].MinScore.ToFloat());
row1.CreateCell(5).SetCellValue(list[i].OrderNumber);
}
System.IO.MemoryStream ms = new System.IO.MemoryStream();

workbook.Write(ms);
ms.Position = 0;

var response = new HttpResponseMessage(HttpStatusCode.OK);
response.Content = new StreamContent(ms);

response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
var fileName = "教学排名_" + (Courselist == null || courseID == null ? "全部" : Courselist.Name) + ".xls";
response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
{
FileName = System.Web.HttpUtility.UrlEncode(fileName)
};
return response;