Excel- NPOI

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 NPOI

dotnetcore/NPOI: A .NET library for reading and writing Microsoft Office binary and OOXML file formats. (github.com)

NPOI is the .NET version of POI Java project at http://poi.apache.org/. POI is an open source project which can help you read/write xls, doc, ppt files. It has a wide application.

For example, you can use it to

generate a Excel report without Microsoft Office suite installed on your server and more efficient than call Microsoft Excel ActiveX at background;

extract text from Office documents to help you implement full-text indexing feature (most of time this feature is used to create search engines).

extract images from Office documents

generate Excel sheets that contains formulas

Install NuGet Package

Install-Package DotNetCore.NPOI