Create and IlCodeGenerator

[Horusiath]

At this moment we have two compilation chains:

• First is based on IL code generation. This one however works only for .NET 4.5
• Second is based on LINQ Expressions and is used universally.

Moreover when we need to construct a serializer for a custom data structure (either class or struct), we always do that through DefaultCodeGenerator, which uses only Expression-based compilation chain.

The idea here is to build a code generator using IlCompiler<> as well.