Monthly Archives: October 2013

EF6 CodeFirst View Generation T4 Template for C# updated for EF6 RTM

The story around pre-generated views in pre-release versions of EF6 was far from glorious. First, things did not work in EF6 Beta1 due to this bug. Then the bug was fixed but due to other changes in this area pre-generated views were broken again in EF6 RC1 (mainly because of the combination of this and this). Because of the issues in the EF6 RC1 I decided not to post the version I had – it just did not work. Finally, it turned out that due to changes in the EF Tooling shipping with Visual Studio 2013 the template did not want to work on Visual Studio 2013 (or Visual Studio 2012 where the new tooling is available out-of-band). That’s a pretty interesting story on its own but for me it meant that I basically had to rewrite the template. Today EF6 has finally landed (btw. Visual Studio 2013 shipped today too) Since the bugs around pre-generated views were fixed I updated the EF6 Code First T4 template for generating views and posted the latest version on the Visual Studio Gallery. The template should work on Visual Studio 2010, Visual Studio 2012 and Visual Studio 2013 and for EF6 RTM and nightly builds. If you need steps to install and use the template take a look at this post.
A couple additional notes:
– an updated version of EF Power Tools which allows generating views (and more) directly from Visual Studio version was shipped recently
– view generation in EF6 has been greatly improved so maybe you don’t really need to use pre-generated views?

(Because you read this post you might be interested in this.)

T4 Templates for Generating Views for EF4/EF5 Database/Model First apps

After we received a comment on the EF team blog asking why the templates for generating views for Edmx based apps we posted years ago were not updated for EF5 Rowan asked me if I it would be possible to update the template so that it works for EF5. I actually remember looking at this template before I shipped my templates generating views for Code First apps and one of the first things I noticed was that the way it handled versions was robust but not very flexible. Therefore, when we shipped EF5, the templates could not be used with apps using v3 of the EF artifacts (edmx). I thought a bit more about this when I was working on the templates for CodeFirst and concluded that robustness is not really very important here. If someone wants views they will have to provide a valid model (be it Code First model or Edmx) or the APIs used for generating views will throw an exception. Since the exception will be displayed in the error pane (and should be understandable for any person who is trying to use pre-generated views) there was no need to sacrifice flexibility for robustness. Also, the expierence of using the template was not very good. It was posted as a .zip file attached to a blog post. Not only wasn’t it discoverable but you would also have to take a number of extra steps to be able to use it. Visual Studio Gallery makes it much easier to find and use extensions like this, so I thought it was not a bad idea to revamp the template and ship it on the VS Gallery (especially given that I already have all the infrastructure needed to create a shippable .VSIX files containing a T4 templates). The only thing I was missing was the template itself. Luckily(?) I was investigating a bug which I thought could be worked around by using pre-generated views. After I finished up coding the template it turned out that this is not the case (i.e. you cannot use pre-generated views if you have QueryViews in your mapping) but at least I had a T4 template for generating views for Database/Model First apps. Now I only had to marry the infrastructure for building .vsix with the template and call it done (I went a bit further and even created a VB.Net version of the template). Since yesterday the templates are available on Visual Studio Gallery – the C# version can be found here and the VB.Net version can be found here. Using the templates is simple. In Visual Studio right-click on your project and select Add→New Item (Ctrl+Shift+A). In the “Add New Item” window select “Online” on the left. You may want to filter by EF5 or edmx. Select the “EF4/EF5 Model/Db First View Gen .tt for {C#|VB.Net}”. Change the name of the .tt file so that it starts with the name of your edmx file (i.e. if your edmx file is called “MyModel.edmx” name the template “MyModel.Views.tt”) and press the “Add” button:

Add New Item - Edmx Views

Add New Item – Edmx Views


and that’s pretty much it – the template and a class containing views should now be added to your project:
Project with views

Project with views


If you want to enforce re-generating views (e.g. after the edmx file changed) just right click the .tt file and select “Run Custom Tool”.
If you need to uninstall the template go to Tools→Extensions and Updates… select the template from the list and click the “Uninstall” button.