Lucene.Net.ObjectMapping for .Net Standard 2.0

It’s been a long time since I’ve done some work on my Lucene.Net.ObjectMapping library. Recently I accepted a pull request that added support for the 4.8 beta releases of Lucene.Net itself, but when I involuntarily needed to updated one of my services to bring it up to speed with running in a Docker container, I decided that it was about time to update Lucene.Net.ObjectMapping for .Net Standard 2.0. The last time I used the library in a Docker container, ASP.NET vNext RC1 was just about to become final. so that’s a long time ago. Accordingly, there was quite a bit of work to understand the changes needed: both in .Net (and ASP.NET) between the 1.0 RC1 and the .Net Standard 2.0 releases, and also between the Lucene.Net 3.x and 4.8 releases. Luckily, the latter was largely taken care of by the pull request for the library itself. The former however proved a bit challenging. After all, the toolset has changed significantly.

Updated Sources

To cut a long story short, the updated sources are now available on GitHub. I decided to track it in a separate branch for better isolation. This new branch is aptly called netstandard. I’ll try to stay up-to-date with the more recent releases of Lucene.Net, and also with .Net Standard 2.0. That is, provided that I find the time for it. You may notice that the project files have become quite a bit simpler. That’s certainly one change in .Net Standard and Core that I welcome. The other is the better integration of Nuget for package referencing and package creation/pushing.

Updated Unit Tests

As a side effect, I also figured that it was going to be easier to update NUnit to the latest version, since its toolset is also well integrated with the new dotnet toolset. Since I’m doing all changes through VSCode and with building/testing/packaging in Docker containers based on the microsoft/aspnetcore-build:2 images, I wanted to keep it simple. The good thing here is that the dotnet toolset seems to offer really everything I need for this, and is suprisingly easy to handle, especially when compared to the RC1 version.

Updated Nuget Package

As I’ve mentioned in the beginning, I primarily made this effort because I needed a newer version of Lucene.Net with compatibility for .Net Standard 2.0. As a result, I published a new RC build as a Nuget package too. It is built on the latest Lucene.Net 4.8 beta release and currently supports only .Net Standard 2.0. If there’s a great demand for it, I’ll see if I can add support for other targets – or accept pull requests accordingly.


Nothing much besides the obvious: .Net Standard seems to be in a good shape wrt libraries and toolset, as well as support on Linux. There are a few gotchas but overall nothing much of a problem. Lucene.Net is still somewhat badly documented itself, and the tracking of braking changes between major/minor versions (and in fact also revisions/beta releases of the same major/minor) could be greatly improved. An online documentation would be very useful – maybe it exists, and I just haven’t found it? In any case, skimming through the Lucene.Net sources on GitHub works too, though being much slower.

You can find more information about object mapping for Lucene.Net on the Lucene.Net.ObjectMapping page.