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Code Generation using T4
- 1. Code Generation using T4 Joubin Najmaie Software Architect @ Softchoice Twitter: @joubin Personal blog: http://joubin.ca http://www.softchoice.com
- 2. T4 - Agenda The “suit” story Demo T4 Overview T4 Syntax Demo More demos
- 3. A “suit” calls a meeting Empower the business users Give control over their content
- 4. Run back to your desk
- 6. Architecting a solution Define content type descriptions etc.
- 7. You start coding away
- 8. Soon you’ll realize … Every time you add a content type Data Access Layer code
- 10. What T4 is not?
- 11. What is T4? T4 is a vehicle Generates code from described models Models could be Visual Class diagrams ERDs Text-based XSD Database Metadata
- 12. What is T4? (cont.) A set of tools to build other tools Describe Domain Model User interface Business process Flow Generate code from model Use T4 to generate code
- 13. T4 - the what What does it stand for? What are the Inputs? What are the outputs? What does the syntax look like? What are the supported languages?
- 14. Current usages of T4 in VS.NET ASP.NET MVC Views Entity Framework 4 model generation VS Project templates VS Item templates Web forms Class
- 15. T4 - Syntax A quick overview of T4 syntax Lots of demos
- 16. Anatomy of T4 templates
- 17. Text Templating Write a text template T4 engine generates a compiled intermediary class T4 engine executes the compiled class to generate output
- 18. Text Templating
- 19. Processing Directives Similar to ASPX and ASCX <#@ and end with #> Directives template assembly import output include
- 20. template directive <#@ template debug="true" language="C#" #> Parameters debug language inherits hostspecific
- 21. template directive parameters debug parameter System %TEMP% folder language parameter Values: C#, VB, C#3.5 inherits parameter Tells which base class to use hostspecific parameter A reference to the object that the hosts the engine. e.g. Host.TemplateFile Host.StandardAssemblyReferences
- 22. assembly directive <#@ assembly #> Parameter name could be an assembly in the GAC <#@ assembly name=“System.Data” #> or absolute path to the assembly <#@ assembly name=“c:rojectsroj1inebugroj1.dll” #>
- 23. import directive <#@ import #> Parameter namespace <#@ import namespace=“System.Collections.Generic” #>
- 24. include directive <#@ include #> Parameter file <#@ include file=“includefile.tt” #>
- 25. T4 Blocks Text blocks Code blocks Statement blocks Expression blocks Class feature blocks
- 26. Text blocks Non-programmatic text
- 27. Text blocks - Syntax
- 28. Statement blocks Delineated using <# #>
- 29. Statement blocks - Syntax
- 30. Expression blocks Delineated using <#= #>
- 31. Expression blocks - Syntax
- 32. Class feature blocks <#+ #> Used to add any class level construct Helper functions Fields Constants Properties
- 33. Class feature blocks - Syntax
- 34. Custom Text Template Host When would you write one? Want to run T4 templates outside of VS.NET Integrate functionality into custom tools
- 35. Code generation
- 36. VS.NET Item template Single file versus multi-file templates As .vsi/.zip VS 2010 /{vs.net folder}/common7/ide/itemtemplates Template parameters are special params When the template wizard runs they are replaced.
- 37. Parameters
- 39. T4 editors in VS.NET Plug-in by Tangible Engineering * http://visualstudiogallery.msdn.microsoft.com/en-us/60297607-5fd4-4da4-97e1-3715e90c1a23 T4 Editor by Clarius http://www.visualt4.com/downloads.html
- 40. Slides will be on blog http://joubin.ca CodePlex project http://codekindler.codeplex.com Provides boilerplate classes using T4 Only a few at the moment Thank You!
- 41. Thanks to our contributors