Получить ссылку на объект из .dll в проекте XNA

void CreateBuildProject()
        {
            string projectPath = Path.Combine(buildDirectory, "content.contentproj");
            string outputPath = Path.Combine(buildDirectory, "bin");
 
            // Create the build project.
            projectRootElement = ProjectRootElement.Create(projectPath);
 
            // Include the standard targets file that defines how to build XNA Framework content.
            projectRootElement.AddImport("$(MSBuildExtensionsPath)\\Microsoft\\XNA Game Studio\\" +
                                         "v4.0\\Microsoft.Xna.GameStudio.ContentPipeline.targets");
 
            buildProject = new Project(projectRootElement);
 
            buildProject.SetProperty("XnaPlatform", "Windows");
            buildProject.SetProperty("XnaProfile", "Reach");
            buildProject.SetProperty("XnaFrameworkVersion", "v4.0");
            buildProject.SetProperty("Configuration", "Release");
            buildProject.SetProperty("OutputPath", outputPath);
 
            // Register any custom importers or processors.
            foreach (string pipelineAssembly in pipelineAssemblies)
            {
                buildProject.AddItem("Reference", pipelineAssembly);
            }
 
            // Hook up our custom error logger.
            errorLogger = new ErrorLogger();
 
            buildParameters = new BuildParameters(ProjectCollection.GlobalProjectCollection);
            buildParameters.Loggers = new ILogger[] { errorLogger };
            buildProject.Save();
        }

public string Build()
        {
            // Clear any previous errors.
            errorLogger.Errors.Clear();
 
            // Create and submit a new asynchronous build request.
            BuildManager.DefaultBuildManager.BeginBuild(buildParameters);
            
            BuildRequestData request = new BuildRequestData(buildProject.CreateProjectInstance(), new string[0]);
            BuildSubmission submission = BuildManager.DefaultBuildManager.PendBuildRequest(request);
 
            submission.ExecuteAsync(null, null);
 
            // Wait for the build to finish.
            submission.WaitHandle.WaitOne();
                   
            BuildManager.DefaultBuildManager.EndBuild();
 
            // If the build failed, return an error string.
            if (submission.BuildResult.OverallResult == BuildResultCode.Failure)
            {
                return string.Join("\n", errorLogger.Errors.ToArray());
            }
 
            return null;
        }

// MSBuild objects used to dynamically build content.
        Project buildProject;
        ProjectRootElement projectRootElement;
        BuildParameters buildParameters;
        List<ProjectItem> projectItems = new List<ProjectItem>();

// What importers or processors should we load?
        const string xnaVersion = ", Version=4.0.0.0, PublicKeyToken=842cf8be1de50553";
 
        static string[] pipelineAssemblies =
        {
            "Microsoft.Xna.Framework.Content.Pipeline.FBXImporter" + xnaVersion,
            "Microsoft.Xna.Framework.Content.Pipeline.XImporter" + xnaVersion,
            "Microsoft.Xna.Framework.Content.Pipeline.TextureImporter" + xnaVersion,
            "Microsoft.Xna.Framework.Content.Pipeline.EffectImporter" + xnaVersion,
 
            // If you want to use custom importers or processors from
            // a Content Pipeline Extension Library, add them here.            
            //
            // If your extension DLL is installed in the GAC, you should refer to it by assembly
            // name, eg. "MyPipelineExtension, Version=1.0.0.0, PublicKeyToken=1234567812345678".
            //
            // If the extension DLL is not in the GAC, you should refer to it by
            // file path, eg. "c:/MyProject/bin/MyPipelineExtension.dll".
            Directory.GetCurrentDirectory() + @"\TerrainContentPipeline.dll",
        };

project.GetItems("Reference").ToList<ProjectItem>()

public void Add(string filename, string name)
{
      ProjectItem item = buildProject.AddItem("Compile", filename)[0];
      item.SetMetadataValue("Link", Path.GetFileName(filename));
      projectItems.Add(item);
}