This UdtTypeName property is required to read or write Geography, Geometry or HierarchyId. I can't find any workaround or post/information on this subject. Does anyone have an explanation?
This is not implementend in netcoreapp1.1.
There is an issue about that in the dotnet corefx project, referencing all the missing API of System.Data.SqlClient, and especially about UdtTypeName: https://github.com/dotnet/corefx/issues/17126