读取上传的Excel文件而不保存

Question

在这段代码中 - 我从用户那里获取上传的文件并将其保存在我的应用程序的文件夹中，然后将OleDbConmnection转换为此Excel文件并读取数据。我的问题是 - 有人可以提出一种方法，这种方式更适合读取这个excel文件，但不能一次又一次地保存它，因为在我的情况下用数据填充数据表

   if (Request != null)
      {
        HttpPostedFileBase file = Request.Files[0];
        if ((file != null) && (file.ContentLength > 0) && !string.IsNullOrEmpty(file.FileName))
        {
          string fileName = file.FileName;
          string fileContentType = file.ContentType;
          string fileExtension = System.IO.Path.GetExtension(Request.Files[0].FileName);


          if (fileExtension == ".xls" || fileExtension == ".xlsx")
          {
            string fileLocation = Server.MapPath("~/Content/") + Request.Files[0].FileName;
            if (System.IO.File.Exists(fileLocation))
            {

              System.IO.File.Delete(fileLocation);
            }
            Request.Files[0].SaveAs(fileLocation);
            string excelConnectionString = string.Empty;
            excelConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" +
            fileLocation + ";Extended Properties=\"Excel 12.0;HDR=Yes;IMEX=2\"";
            //connection String for xls file format.
            if (fileExtension == ".xls")
            {
              excelConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" +
              fileLocation + ";Extended Properties=\"Excel 8.0;HDR=Yes;IMEX=2\"";
            }
            //connection String for xlsx file format.
            else if (fileExtension == ".xlsx")
            {
              excelConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" +
              fileLocation + ";Extended Properties=\"Excel 12.0;HDR=Yes;IMEX=2\"";
            }
            //Create Connection to Excel work book and add oledb namespace
            OleDbConnection excelConnection = new OleDbConnection(excelConnectionString);
            excelConnection.Open();

            OleDbCommand cmd = new OleDbCommand("SELECT * FROM [Sheet1$]", excelConnection);
            OleDbDataAdapter objAdapter1 = new OleDbDataAdapter(cmd);
            DataTable dt = new DataTable();
            DataSet ds = new DataSet();
            objAdapter1.Fill(ds);

            DataTable Dt = ds.Tables[0];

Answer 1

查看此库。 Excel Data Reader

修改 例如：

if (Request != null)
{
   HttpPostedFileBase file = Request.Files[0];
   if ((file != null) && (file.ContentLength > 0) && !string.IsNullOrEmpty(file.FileName))
   {
        string fileName = file.FileName;
        string fileContentType = file.ContentType;
        string fileExtension = System.IO.Path.GetExtension(Request.Files[0].FileName);

        if (fileExtension == ".xls" || fileExtension == ".xlsx")
        {
            IExcelDataReader excelReader;
            if (fileExtension == ".xls")
                excelReader = ExcelReaderFactory.CreateBinaryReader(stream);
            else
                excelReader = ExcelReaderFactory.CreateOpenXmlReader(stream);

            excelReader.IsFirstRowAsColumnNames = true;
            DataSet ds = excelReader.AsDataSet();

            DataTable Dt = ds.Tables[0];

Answer 2

此行

HttpPostedFileBase file = Request.Files[0];

说不可能将HttpPostedFile转换为HttpPostedFileBase