A couple of years ago, I created a simple .net Library to create Excel .xlsx sheets without the need to do any COM Interop or similar nonsense, so that it can be used on a web server.
I just pushed a major new version, Simplexcel 2.0.0 to NuGet. This is now targeting both .net Framework 4.5+ and .NET Standard 1.3+, which means it can now also be used in Cross-Platform applications, or ASP.net Core.
There are a few breaking changes, most notably the new
Simplexcel.Color struct that is used instead of
System.Drawing.Color and the change of
CompressionLevel from an enum to a bool, but in general, this should be a very simple upgrade. Unless you still need to target .net Framework 4 instead of 4.5+, stay on Version 1.0.5 for that.