C# and the .NET Framework: The C++ Perspective

The #using Directive

#using can be considered equivalent to the import statement and is used to refer to the .NET libraries. For example, to use some of the .NET framework classes in your C++ code, you first employ the following:

#using <mscorlib.dll>

This directive should be followed by the declaration for exactly which namespaces you need.

Listing 1.4.1 shows the creation of a simple application containing a GC class.

Listing 1.4.1. managed.cpp: A First Look at Garbage Collected C++

#using <mscorlib.dll> // import the library using namespace System; __gc class MCPPDemo { public: void SayHello() { Console::WriteLine("Hello Managed C++"); } }; void main() { MCPPDemo *pD=new MCPPDemo; pD->SayHello(); }

There are a few things in this code ...