Read Struct and enum definitions in C#

Not sure. Here's the sample source code:

namespace Engine
{
//-----------------------------------------------------
    public enum a
    {
       ...
    }
    public enum b
    {
       ...
    }
    [StructLayout(LayoutKind.Sequential)]
    public struct a
    {
       ...
    }
    [StructLayout(LayoutKind.Sequential)]
    public struct b
    {
       ...
    }
    ...
//-----------------------------------------------------
}

I want cut out the portion between the lines, save it to a file as is, and in its place the syntax to read the file back.

Yes I'm doing it at compile time.  What got this whole thing started is that I'll have a conversion utility that takes a C header file and converts all its structs and enums into a file that will replace the portion in between the dash lines, and of course the file will have to be read in.

Given all the difficulties, I guess the easiest way is to add hard-coded lines to the conversion util to write all the necessary using statements at the top, add namespace, etc, so that the converted file is a complete C# source file.

Thanks for your help.