外部表不是 asp.net 的预期格式

Question

我正在尝试导入和导出 Excel。这是流程..一个用户下载Excel，另一个用户上传它。 Excel 从一个 Web 应用程序下载，然后上传到另一个 Web 应用程序。（选择 excel 数据并执行不同的操作）

EXCEL下载代码

HttpContext.Current.Response.Clear()
        HttpContext.Current.Response.ClearContent()
        HttpContext.Current.Response.ClearHeaders()
        HttpContext.Current.Response.Buffer = True
        HttpContext.Current.Response.ContentType = "application/ms-excel"
        HttpContext.Current.Response.Write("<!DOCTYPE HTML PUBLIC ""-//W3C//DTD HTML 4.0 Transitional//EN"">")
        HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=Reports.xls")

        HttpContext.Current.Response.Charset = "utf-8"
        HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("windows-1250")
        'sets font
        HttpContext.Current.Response.Write("<font style='font-size:10.0pt; font-family:Calibri;'>")
        HttpContext.Current.Response.Write("<BR><BR><BR>")
        'sets the table border, cell spacing, border color, font of the text, background, foreground, font height
        HttpContext.Current.Response.Write("<Table border='1' bgColor='#ffffff' " + "borderColor='#000000' cellSpacing='0' cellPadding='0' " + "style='font-size:10.0pt; font-family:Calibri; background:white;'>")
        'am getting my grid's column headers
        Dim columnscount As Integer = GridView_Result.Columns.Count

        Dim Console As String = ""
        HttpContext.Current.Response.Write("<TR>")
        For Each column In dtEmp.Columns
            HttpContext.Current.Response.Write("<Td>")
            HttpContext.Current.Response.Write(column.ColumnName)
            HttpContext.Current.Response.Write("</Td>")
        Next
        HttpContext.Current.Response.Write("</TR>")
        For Each row As DataRow In dtEmp.Rows
            'write in new row
            HttpContext.Current.Response.Write("<TR style=background-color :#FFFFFF>")
            For i As Integer = 0 To dtEmp.Columns.Count - 1
                HttpContext.Current.Response.Write("<Td>")
                HttpContext.Current.Response.Write(row(i).ToString())
                HttpContext.Current.Response.Write("</Td>")
            Next

            HttpContext.Current.Response.Write("</TR>")
        Next
        HttpContext.Current.Response.Write("</Table>")
        HttpContext.Current.Response.Write("</font>")
        HttpContext.Current.Response.Flush()
        HttpContext.Current.Response.[End]()

        Response.ClearContent()

现在我可以下载 Excel，但是当我上传它并尝试阅读它时，它给了我“外部表不是预期的格式”错误但是当我手动创建任何 excel并尝试上传并阅读该excel，然后它就可以完美运行并且不会出现任何错误

EXCEL阅读代码

var FilePATH = Server.MapPath("~/Reports/" + "DEMO.xls");
            if (FileUpload1.HasFile)
            {
                string con = "provider=Microsoft.ACE.OLEDB.12.0;;Data Source={0};" +
                             "Extended Properties='Excel 12.0;HDR=YES;IMEX=1'";

                FileUpload1.SaveAs(FilePATH);



                con = String.Format(con, FilePATH);
                OleDbConnection connExcel = new OleDbConnection(con);
                OleDbCommand cmdExcel = new OleDbCommand();
                OleDbDataAdapter oda = new OleDbDataAdapter();
                DataTable dt = new DataTable();
                cmdExcel.Connection = connExcel;

                //Get the name of First Sheet
                connExcel.Open();
                DataTable dtExcelSchema;
                dtExcelSchema = connExcel.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
                string SheetName = dtExcelSchema.Rows[0]["TABLE_NAME"].ToString();
                connExcel.Close();

                //Read Data from First Sheet
                connExcel.Open();
                cmdExcel.CommandText = "SELECT * From  [" + SheetName + "]";
                oda.SelectCommand = cmdExcel;
                oda.Fill(dt);
                connExcel.Close();

如果您在不使用任何第三方 DLL 的情况下为我提供答案并且生产服务器没有安装 office 并且将来不会安装它会很好。所以我也不能使用 interlope

当我打开下载的 excel 并将其保存为“EXCEL 97-2003 工作簿”时，这个新的 excel 工作正常

Answer 1

你可以只导出表格标签并重试吗？

如果你手动填写 Excel，它肯定是正确的格式，而导出的 html 可能解释不正确。

即使您要求不建议第三方 dll，我也建议使用 ClosedXml（免费和开源）