I was wondering if there were any third party libraries that provide support for barcode scanning using Kinect 2.0 in C#.
I think the Kinect SDK doesn't provide any support for such a thing.
ZXing.Net supports Kinect.
https://github.com/micjahn/ZXing.Net
You need the zxing.dll and the zxing.kinect.dll from the binaries package. ZXing.Net is available as NuGet package but it doesn't include the zxing.kindect.dll.