Access C# methods with native C++ calls

We are a software company and our main products are written in native C++. However one of our tasks requires to integrate a .NET dll (an API) with our modules written in C++ so we're looking for a skilled programmer who can "wrap" the .NET classes into unmanaged C++ classes for future use with the main C++ applications. There are several options to handle this task, but the main restriction that will give more weight on a particular one will consider the easiness of the integration and the speed of invoking a method(we will be doing frequent method calls). The current options on the table for implementing this wrapper are: a) A socket communication between the .NET and the C++ modules; b) Creating a COM interface for the C++ classes and access the .NET API via COM interop; c) Use of managed C++ to access the .NET library and wrap these calls into native C++ classes; All information about this .NET library can be found here: [login to view URL] Specific API documentation: [login to view URL] We will consider for this job only programmers with relevant experience who can suggest the best option AND can implement this wrapper for us. Good luck! Victor