c# - IL Emit base class name is the same as inherited class; protobuffer does not accept cyclic inheritance -

i have emitted code returns object of type passed in, propertychange notification wrapped virtual properties, modification tracking client. new type shared between client , server (serialized using protobuf.net). i'm limited not using third-party libraries, other use of protobuf.net.

the issue i'm having when try serialize list of new objects (for example, typea) using protobuffer, run "unexpected sub-type: typea", , when try add subtype model protobuffer using runtimetypemodel, run "cyclic inheritance not allowed", protobuffer not accept @ time, afaik.

i'm new reflection.emit - there way type new class emitted different type i'm emitting, @ least in name? may able overcome cyclic inheritance restriction in case. i'd avoid creating/copying new objects.

for instance, emit new object as:

newtypea -base typea 

instead of:

typea -base typea -sub-type typea 

il emitter:

usage: type atype = createproxy(typea);        activator.createinstance(atype);  public static type createproxy(type type) {     var assmname = new assemblyname("dynamicproxyassembly");     ab = appdomain.currentdomain.definedynamicassembly(assmname, assemblybuilderaccess.run);     mb = _ab.definedynamicmodule(assmname.name);      typebuilder typebuilder = mb.definetype(type.namespace + "." + type.name + "__proxy", typeattributes.public, type);     typebuilder.addinterfaceimplementation(typeof(inotifypropertychanged));      fieldbuilder eventfield = createpropertychangedevent(typebuilder);      methodbuilder raisepropertychanged = createraisepropertychanged(typebuilder, eventfield);      methodinfo ismodifiedsetmethod = type.getproperty("modified").setmethod;      foreach property in type virtual, wrap method propertychangednotification...      type ret = typebuilder.createtype(); // returns typea__proxy derived (base=typea__proxy). } 

it turns out runtimetypemodel used when serializing through protobuffer. there nothing wrong sub-classing emitted type derived type.

i needed add type of instance instead of typea:

runtimetypemodel.default.add(typeof(typea), true).addsubtype(555, typeainstance.gettype()); 

...before had:

runtimetypemodel.default.add(typeof(typea), true).addsubtype(555, typea); 

which, of course, returned cyclic error.

i hope helps in future.