Comments on: Build beautiful XLS documents in .NET with NPOI

By: Avinesh

Avinesh — Sun, 19 Jun 2011 06:35:49 +0000

Hi,

I just starting using NPOI to build a .net application that can export data to excel and it is working well. However now I would like to increase the application’s performance by decreasing the actual runtime, by making use of multi-core processing (or parallel processing) to get the full usage of the processing power and decrease the conversion time.

Do you have any suggestion with regards to this using NPOI?

Thanks in advance,

By: Zach

Zach — Tue, 24 May 2011 22:34:20 +0000

Yes… You can save it to the server by changing the “Write” method to use a file stream that points to a location on your server.

FileStream fs=new FileStream("c:\\MyExcelData.XLS", FileMode.Append, FileAccess.Write, FileShare.Write);

By: Jason ⋆★ 'Loki '★⋆ Smith

Jason ⋆★ 'Loki '★⋆ Smith — Fri, 13 May 2011 13:25:03 +0000

awesome post zach!!!!!!!!!!

thanx a million!

By: mkk

mkk — Tue, 03 May 2011 16:46:18 +0000

Hi Zach,

This was a nice blog post, is there someway that i want to save the file in the server, and directly to the browser

By: Zach

Zach — Mon, 04 Apr 2011 21:24:42 +0000

Tim,

Yes, you can definitely add more sheets… I have an example in one of my other posts about automatically starting a new sheet when you hit 65.5K row limit. In a nutshell, you need to track your row count and once you hit the limit you create a new sheet and continue loading. If you need to work with lots of rows and your using Office 2007+ you should consider XLSX since the limit was increased to 1M rows.

Zach

By: Tim Larkin

Tim Larkin — Mon, 04 Apr 2011 16:35:22 +0000

Hi Zach.
I am running into a problem. I wrote a C# console app that processes dozens of XML files, one at a time and writes them out as .XLS files. The issue I am not running into is this. Some of the XML files are hitting 400Mbytes in size. Which means I am hitting some memory issue, but the issue I am primarily concerned with is I am not hitting files with multiple sheets some of which contain as many as 100 thousand Rows so I am getting and int16 based error. Is there anyway to A). Append sheets to an existing xls file.
and B) have you are anyone you know of recoded or changed the library to use int 32 for more records?

By: Macsys

Macsys — Mon, 24 Jan 2011 10:42:14 +0000

I was just looking for something like this to export my data table to Excel in BIFF format. It worked great.

One thing. Can you suggest something similar which produces .XLSX (2007 Format) files.

Thanks