I have T4 template (mycode.tt) which generates a cs file. I usually right click the tt file and select RunCustomTool which internally takes an xml file and generate code for me.
You can easily achieve it, when you using VS2010. If you add a new file to the project, choose a preprocessed text template file. You can edit the template just as normal. Instead of generating the output directly, the file generates the code that is generated normally. I know it sounds confusing. But what you see in your output file is the code generated by the text templating toolkit to get your output (more or less).
This is a short example of a preprocessed text template named "TestTemplate.tt" and how do you use it in your code:
The tt-file:
<#@ template language="C#" #> Some output.
Code:
using System; using System.Diagnostics; namespace Test { class Program { static void Main(string[] args) { TestTemplate testTemplate = new TestTemplate(); Debug.Print(testTemplate.TransformText()); } } }