How to output namespace in T4 templates?

Question

I have a T4 template for a class set up with TextTemplatingFileGenerator Custom Tool in Visual Studio:

<#@ template language=\"C#v3.5\" hostspecific=\"Tru         


        

Answer 1

The accepted answer doesn't work on Visual Basic Projects. I had to use the method from: http://lennybacon.com/post/2010/12/10/generatingcodefileswithcorrectnamespacesusingt4

var hostServiceProvider = (IServiceProvider)Host;
var dte = (EnvDTE.DTE)hostServiceProvider.GetService(typeof(EnvDTE.DTE));
var activeSolutionProjects = (Array)dte.ActiveSolutionProjects;
var dteProject = (EnvDTE.Project)activeSolutionProjects.GetValue(0);
var defaultNamespace = dteProject.Properties.Item("DefaultNamespace").Value;