How to know if a type has been already declared in another source file in C#? -

i have source file in c# holds misc types project inside own namespace. example:

#define helper_file  using system;  namespace helper {     public struct normalbalance : inormaltype     {         public int position { get; set; }         public float normal { get; set; }     }      ...  } 

then, other files use these types. want distribute of these others in team, don't need of files, or types, data structures shared.

for example:

using system;  namespace datapump {     public class pumper     {         private helper.normalbalance[] norm;          ...     }      ...  } 

but code depends on previous file containing helper.normalbalance type. want method sync files 1 knows of existence of other in c++ use #define directive in file declares type, , if client file didn't see token defined, conditionally compile type follows:

(c++ code follows)

    class pumper     {      private:  #ifndef helper_file         struct normalbalance         {             int position;             float normal;         }          normalbalance[] norm;  #else          helper.normalbalance[] norm;  #endif          ...     }      ...  } 

unfortunately, #define directive's scope in c# file declared. there way in c#? need know if file included in project, or if, @ least, type has been defined , if not, define again.

on .net framework, if wish share library of types, recommend packaging them single project. when built, becomes assembly can referenced other assembly. define directives used different purposes , so. less prevalent in c++ development.