Mvc导入

[HttpPost]
public void Import()
{
//获取文件

HttpPostedFileBase fileBase = Request.Files["file"];

if(fileBase==null)
{
　　Response.Write("");
}
//转数据流
Stream stream = fileBase.InputStream;
IWorkbook workbook = null;

if (Path.GetExtension(fileBase.FileName).ToLower().Equals(".xls"))
{
　　workbook = new HSSFWorkbook(stream);
}
//获取sheet
ISheet sheet = workbook.GetSheetAt();
//获取头
IRow row = sheet.GetRow();
//定义datatable
DataTable dt = new DataTable();
foreach (ICell item in row.Cells)
{
//循环添加表头
　　dt.Columns.Add(item.StringCellValue);
}
for (int i = ; i <= sheet.LastRowNum; i++)
{
　　DataRow dr = dt.NewRow();
　　for (int j = ; j < sheet.GetRow(i).Cells.Count; j++)
{

CellType cellType = sheet.GetRow(i).Cells[j].CellType;
int index = sheet.GetRow(i).Cells[j].ColumnIndex;
switch (cellType)
{
　　case CellType.Numeric:dr[index]=sheet.GetRow(i).Cells[j].NumericCellValue;
　　break;
　　case CellType.String:
　　dr[index] = sheet.GetRow(i).Cells[j].StringCellValue;
　　break;
　　case CellType.Boolean:
　　dr[index] = sheet.GetRow(i).Cells[j].BooleanCellValue;
　　break;
　　}
}
　　dt.Rows.Add(dr);
}

//sql拼接
try
{
dt.Columns.RemoveAt();
foreach (DataRow item in dt.Rows)
{
　　string sql = $"inserrt into mess values(";
　　foreach (object it in item.ItemArray)
　　{
　　sql += $"'{it}',";
　　}
　　sql = sql.TrimEnd(',');
　　sql += ")";
　　DB.ExecuteNonQuery(sql);
　　}
}
catch (Exception)
{

throw;
}
}

//前台

<form action="/Default/Import" method="post" enctype="multipart/form-data">
<input type="file" name="file" id="file">
<input type="submit" name="name" class="btn btn-success btn-sm" value="导入">
</form>