[UPDATED] Download Xlsx File In Asp.net C

In ASP.Net, I'm using NPOI to write save to an Excel doc and I've just moved to version 2+. It worked fine writing to xls but switching to xlsx is a little more challenging. My new and improved code is adding lots of NUL characters to the output file.

You can see i commented out some code that saves the excel file locally as an .xlsx file, instead of returning a memorystream. I did this to ensure the problem was not in the excel generation. The file saved locally on the server appears to be correct, and it has a size of 3442 Bytes (this is relevant later on).

Download Xlsx File In Asp.net C

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The result is that a popup box appears prompting me to download an excel file. However, the file cannot be read, and when it is opened the message appears "We found a problem with some content in asdfq.xlsx. Do you want us to try to recover as much as we can? If you trust the source of this workbook, click Yes." When I click yes, I get "Excel cannot open the file asdfq.xlsx because the file format or file extension is not valid. Verify that the file has not been corrupted and that the file extension matches the format of the file."

I have read the other threads, and I am not having much success. I can export a URL as text, but I haven't been able to get it to show up as a clickable link in an xlsx file. Can someone please help me? Below are the examples preceded by a note about its behavior:

XLSX is well-known format for Microsoft Excel documents that was introduced by Microsoft with the release of Microsoft Office 2007 and is based on the Office Open XML (OOXML) standard ECMA-376. the new format is a zip package that contains a number of XML files. The underlying structure and files can be examined by simply unzipping the .xlsx file.

I compared and found both file's content were same but file extension were not same. When i downloaded from google chrome file extension was ".xls" but when i was downloaded from Mozilla file extension was ".xlsx".

To save the Spreadsheet document as an xlsx, xls, csv, or pdf file, by using save method should be called with the url, fileName and saveType as parameters. The following code example shows to save the spreadsheet file as an xlsx, xls, csv, or pdf in the button click event.

Load Excel documents initially or open them like an Excel application with data accuracy, styles, and formats. Microsoft Excel (.xlsx), Microsoft Excel 97-2003 (.xls), and comma-delimited values (.csv) file formats can be opened in a ASP.NET MVC Spreadsheet.

Easily save the ASP.NET MVC Spreadsheet component with data accuracy, styles, and formats as an Excel file. The ASP.NET MVC Spreadsheet supports file formats such as Microsoft Excel (.xlsx), Microsoft Excel 97-2003 (.xls), and comma-delimited values (.csv).

This Professional .NET Excel API is a standalone Excel .NET managed assembly and does not depend on Microsoft Office Excel. Spire.XLS for .NET offers support both for the old Excel 97-2003 format (.xls) and for the new Excel 2007, Excel 2010, Excel 2013, Excel 2016 and Excel 2019 (.xlsx, .xlsb, .xlsm), along with Open Office(.ods) format. It features fast and reliably compared with developing your own spreadsheet manipulation solution or using Microsoft Automation.

This works perfect for PDF's and xls files. But there's something strange with xlsx files: the managed metadata property (DocumentType) stays empty (its a term form the termstore). Does anyone know a solution?

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The FlexSheet control extends the FlexGrid control and provides an Excel-like functionality.FlexSheet supports all the FlexGrid's features, and focuses on the key features from Excel not included in FlexGrid.

Note:FlexSheet requires the JSZip library for loading and saving xlsx file, you should add jszip.js via CDN or include the script file in the project. 2351a5e196