.NET (Core and Framework)

private class DllMain
{
public:
      DllMain();
      ~DllMain();

};

DllMain g_DllMain;

DllMain::DllMain()
{
       // My DllMain code goes here, its just me registering classes
       // with their own dynamilcally generated class in order to create
       // a factory-style system.
}

public static ref class Forge<T> // Allows dynamic generation of a type-dictionary
{
public:
       static void Register(ISmith<T> smith)
       {
              m_Smith = smith; // The problem is here... m_Smith stays NULL.
       }

private:
       static ISmith<T> m_Smith;
}

AppDomainSetup setup = new AppDomainSetup();
setup.ShadowCopyFiles = "true";
setup.SandboxInterop = true;
setup.PrivateBinPath = "Bin/";

string domainName = input.Substring(input.LastIndexOf('\\') + 1);
domainName = domainName.Substring(0, input.LastIndexOf('.'));
domainName += " Domain";

AppDomain domain = AppDomain.CreateDomain(domainName, null, setup);

string typename = AssemblyName.GetAssemblyName(input).FullName;
typename = typename.Substring(0, typename.IndexOf(','));
typename += ".Plugin";

IPlugin plugin = (IPlugin)(domain.CreateInstanceFromAndUnwrap(input,   typename));

plugin.Initialize(domain);

return plugin;