Excel无法打开Gembox电子表格文件

Question

I have this code to generate an Excel file and download it:

SpreadsheetInfo.SetLicense("mycode"); 
ExcelFile myExcelFile = new ExcelFile();
ExcelWorksheet ws = myExcelFile.Worksheets.Add("Page 1");
myExcelFile.Save(Response, "asd.xlsx"); //this is for download

When I download the Excel file, it says:

Either file type or file extension is not valid so Excel cannot open this file. Confirm that file is not broken or file extension matches file type.

I'm trying to solve this for hours but I couldn't find a solution. I use same code other places and it works, but it doesn't work at this part of my project. Can you tell me what I should do? Thanks.

Answer 1

Try to save the fire as an xls-file instead of an xlsx-file. I'm guessing that the default is xls. Excel can get confused if the file extension is wrong.

Answer 2

I had the same issue and it was caused by the worksheet title. The worksheet title should not be too long. I think the limit is 32 characters.

Answer 3

HYE. TRY THIS. I'VE TRY SOME EXAMPLES FROM GEMBOX SPREADSHEET WEBSITE.

Imports GemBox.Spreadsheet
Imports GemBox.Spreadsheet.WinFormsUtilities
Imports System.Data.OleDb

Public Class Form1

Public Sub New()
    SpreadsheetInfo.SetLicense("FREE-LIMITED-KEY")

    InitializeComponent()
End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

    Dim openFileDialog = New OpenFileDialog()
    openFileDialog.Filter = "XLS files (*.xls, *.xlt)|*.xls;*.xlt|XLSX files (*.xlsx, *.xlsm, *.xltx, *.xltm)|*.xlsx;*.xlsm;*.xltx;*.xltm|ODS files (*.ods, *.ots)|*.ods;*.ots|CSV files (*.csv, *.tsv)|*.csv;*.tsv|HTML files (*.html, *.htm)|*.html;*.htm"
    openFileDialog.FilterIndex = 2

    If (openFileDialog.ShowDialog() = DialogResult.OK) Then
        Dim ef = ExcelFile.Load(openFileDialog.FileName)

        ' Export Excel worksheet to DataGridView control.
        DataGridViewConverter.ExportToDataGridView(ef.Worksheets.ActiveWorksheet, Me.DataGridView1, New ExportToDataGridViewOptions() With {.ColumnHeaders = True})
    End If



End Sub

THAT OPEN FILE DIALOG, YOU CAN MINIMIZE TO READ EXCEL FILE ONLY