Using a C/C++ data structure in a C# program

Answer 1

If performance is important to you, then you should avoid crossing the managed/unmanaged boundary "lots of times". Both C# and C++ can be high performance languages but the interop perf costs are not pleasant.

I suggest you write a C library (which could be implemented with C++ constructs as long as the methods are extern C) and call it from the C# code -once!- using P/Invoke. This library can party on your high performance data structure and return some useful information to the C# side.

Answer 2

You can use a pipe.