ASP.NET Server side uploading and reading excel spreadsheets > 255 columns with Open.XML

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Hi,

I am having memory leaks trying to implement an ASP.NET Application, using OPEN XML SDK 2.x to upload and read .xlsx files with >255 columns.

The current development machine where its hosted runs out of memory as it reads the data in a List object in c#.

Any help is appreciated.

Posted 17-Sep-12 20:08pm

AU Jase

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Herman<T>.Instance 18-Sep-12 3:25am

do you do open file of do you use filestream?
A list is quite consuming. is it the > 255 columns or the number of rows that is the problem?

AU Jase 18-Sep-12 21:57pm

I need to use XMLReader but not using DOM, but using SAX (Simple API XML), do you have suggestions?

Herman<T>.Instance 20-Sep-12 10:34am

EPPLUS

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AU Jase · Accepted Answer · 2012-09-19T12:17:00

The only compromise I have found is to use a desktop app downloadable from the server ASP.NET which converts the .xlsx to CSV with the Open XML SDK. Then upload the comma delimited CSV to the server for processing into a datatable.

Benefits are:

No System.OutofMemory exceptions.
Response time and server load greatly improved.

The downside is, the file is in raw text format, may need an encryption/decryption scheme to guarantee security.

Also need to resolve concurrency issues.