读取上传的Excel文件而不保存它

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中的文件夹中，然后对此 Excel 文件进行 OleDbConnection 并读取数据。我的问题是 - 有人可以建议一种阅读此 Excel 文件的首选方法，但无需预先保存它，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];

看看这个图书馆。Excel 数据阅读器 https://exceldatareader.codeplex.com/

EDIT例子：

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];