Hi all!
I fork Xml-Rpc.NET project(http://xml-rpc.net/) to remake it for .NET Core, but .Net Core doesn't support System.Remoting(https://github.com/dotnet/corefx/issues/14303).
Well, I commented out lines in files XmlRpcClientFormatterSinkProvider.cs, XmlRpcClientFormatterSink.cs and XmlRpcProxyGen.cs.
You can use HttpWebRequest for requests to server and classes XmlRpcRequestSerializer,
XmlRpcResponseDeserializer for serialization
Good luck!