TSPLib.Net is a C# .Net wrapper library for TSPLIB (http://comopt.ifi.uni-heidelberg.de/software/TSPLIB95, a library of sample instances for the TSP and related problems from various sources and of various types collected by Heidelberg university) that provides complete access to all the information provided in TSPLIB95 as of October the 2nd, 2020.
$ dotnet add package TSPLib.NetNo README available.