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The examples were helpful. I was able to change my code from using Microsoft interop library (horribly slow) to this library (version 4.x) in a couple hours. My benchmark writes a file with two tabs and about 750,000 cells. Using MS interop it took 13 minutes. Using EPPlus it took 10 seconds, a roughly 80x speedup. Very happy!
– Paul Chernoch
Commented Feb 10, 2015 at 18:55
@JanKällman You should update your CodePlex page to show you've got these methods available: LoadFromCollection<T>, LoadFromDataTable etc. (found via here)
– PeterX
Commented Feb 24, 2015 at 3:39
3

For clarity in this thread, the LGPL allows the software to be linked to without the infective part of the GPL occuring. You only need to open source changes you make to ClosedXml or if you directly put the source code (as opposed to referencing the ClosedXml assemblies) inside of your application then you need to open source your application.
– Chris Marisic
Commented Aug 12, 2015 at 16:10
9

@Paul Chernoch: We populate large Excel sheets with interop very quickly. The secret is to do a bulk update. Create a object [,] block, populate that, then write that matrix to Excel at one time: excelWorksheet.get_Range(range).Value2 = block;
– Marc Meketon
Commented Feb 15, 2018 at 22:53
4

I don't think suggesting a paid product is a solution to this question.
– Niels Abildgaard
Commented Nov 18, 2022 at 15:04

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