asp.net如何导入与导出excel文件

/// <summary>
/// 导出Excel
/// </summary>
/// <param name="stime"></param>
/// <param name="etime"></param>
/// <returns></returns>
public ActionResult Export(FormCollection frm)
{
DataTable dts = new DataTable();
dts = _shopMemeber.ExportMemberData(frm);
IWorkbook workbook = new XSSFWorkbook();
ISheet sheet = workbook.CreateSheet();
IRow headerRow = sheet.CreateRow(0);
foreach (DataColumn column in dts.Columns)
headerRow.CreateCell(column.Ordinal).SetCellValue(column.Caption);
int rowIndex = 1;
foreach (DataRow row in dts.Rows)
{
IRow dataRow = sheet.CreateRow(rowIndex);
foreach (DataColumn column in dts.Columns)
{
dataRow.CreateCell(column.Ordinal).SetCellValue(row[column].ToString());
}
rowIndex++;
}
string filepath = Server.MapPath("/") + @"用户列表.xlsx";
FileStream file = new FileStream(filepath, FileMode.Create);
workbook.Write(file);
ExcelHelper.DownLoad(@"/用户列表.xlsx");
#region 不启用
#endregion
return SuccessMsg("AdminMemberMemberIndex");
}
//下载到桌面的方法，没实现自选路径
public static void DownLoad(string FileName)
{
 FileInfo fileInfo = new FileInfo(HttpContext.Current.Server.MapPath(FileName));
 //以字符流的形式下载文件
 FileStream fs = new FileStream(HttpContext.Current.Server.MapPath(FileName), FileMode.Open);
byte[] bytes = new byte[(int)fs.Length];
fs.Read(bytes, 0, bytes.Length);
fs.Close();
HttpContext.Current.Response.ContentType = "application/octet-stream";
 //通知浏览器下载文件而不是打开
HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(fileInfo.Name, System.Text.Encoding.UTF8));
HttpContext.Current.Response.BinaryWrite(bytes);
 HttpContext.Current.Response.Flush();
HttpContext.Current.Response.End();
}

/// <summary>
/// 导入数据
/// </summary>
/// <param name="file"></param>
/// <returns>true表示导入成功</returns>
public bool Impoart(HttpPostedFileBase file)
{
try
{
//保存excel
string path = HttpContext.Current.Server.MapPath("/");
file.SaveAs(path + file.FileName);
//读取
FileStream sw = File.Open(path + file.FileName, FileMode.Open, FileAccess.Read);
IWorkbook workbook = new XSSFWorkbook(sw);
ISheet sheet1 = workbook.GetSheet("Sheet1");
//最大行数
int rowsCount = sheet1.PhysicalNumberOfRows;
//判断首行是否符合规范也就是Excel中的列名
IRow firstRow = sheet1.GetRow(0);
if (
!(firstRow.GetCell(0).ToString() == "名称" && firstRow.GetCell(1).ToString() == "简称" &&
firstRow.GetCell(2).ToString() == "分类" && firstRow.GetCell(3).ToString() == "参考价" &&
firstRow.GetCell(4).ToString() == "商品介绍"))
{
return false;
}

//跳过类型不正确的品项
for (int i = 1; i < rowsCount; i++)
{
IRow row = sheet1.GetRow(i);
Shop_Product product = new Shop_Product();
string category = row.GetCell(2) != null ? row.GetCell(2).ToString() : null;
if (!string.IsNullOrEmpty(category))
{
var cate =
_unitOfWork.Shop_ProductCategoryRepository().GetAll().FirstOrDefault(t => t.Name == category);
if (cate != null)
{
product.ProductCategoryName = cate.Name;
product.Shop_ProductCategory_ID = cate.ID;
}
else
{
continue;
}
}
else
{
continue;
}
product.PName = row.GetCell(0) != null ? row.GetCell(0).ToString() : null;
product.PCName = row.GetCell(1) != null ? row.GetCell(1).ToString() : null;
if (row.GetCell(3) != null)
{
product.Price = Double.Parse(row.GetCell(3).ToString());
}
product.Description = row.GetCell(4) != null ? row.GetCell(4).ToString() : null;
_unitOfWork.Shop_ProductRepository().Insert(product);
}
_unitOfWork.Save();
}
catch
{
return false;
}
return true;
}