After updating Entity Framework model, Visual Stud

问题:

If I do any changes to my EF 5.0 model, VS does not seem to see the changes. I have tried adding a new table, which shows up fine in the model, but then if I try to use it somewhere the table does not show up in intellisense and I can't use it.

I have also tried changing datatypes of a column, which again shows up fine if I look at the .edmx model file, but visual studio will still give me compiler errors on that field because I am trying to assign the incorrect datatype.

If I delete the EDMX completely, and recreate it, then the changes work fine. but it is tiresome to regenerate from database each time when I should be able to just "update model from database" and rebuild.

I have never had these problems with EF before. Does anyone know the cause or the fix to this problem?

Thanks.

回答1:

If this is the bug with the edmx file located in a folder it is now fixed - download and install VS 2012 Update 1. You can get it from: http://www.microsoft.com/visualstudio/eng/downloads#d-visual-studio-2012-update

回答2:

First Build your Project and if it was successful, point the "model.tt" in the context. then run custom tool. It will fix it.

Again Build your project and point to "model.context.tt" run custom tool. it will update DbSet lists.

回答3:

This is apparently a bug in the Entity Framework that the model does not get updated when your Edmx file is located inside a folder. The workarounds available at the moment are:

1. Install VS 2012 Update 1 which should fix the bug.
2. If you are not in a position to install Update 1, you will have to right click on the model.tt T4 template file and click run custom tool. This will update the classes for you.

Hope that helps someone out there.

Link: http://thedatafarm.com/blog/data-access/watch-out-for-vs2012-edmx-code-generation-special-case/

回答4:

I also had this problem, however, right-clicking on the model.tt file and running "Custom tool" didn't make any difference for me somehow, but a comment on the page Ghlouw linked to mentioned to use the menu item "BUILD > Transform All T4 Templates." which did it for me

回答5:

You should have a <XXX>Model.tt file somewhere which is the T4 template that generates your model classes.

If it is in a different project, it will not update when you save the edmx file.

Anyway, try right-clicking on it in Solution Explorer and choosing Run Custom Tool

回答6:

Right click the .tt file and select "Run Custom Tool", that should update it:

回答7:

I searched for this answer because I had a similar situation in VS2013. In my case, I found that a simple "Clean Solution" cleared out all the old definitions.

回答8:

Are you working in an N-Tiered project? If so, try rebuilding your Data Layer (or wherever your EDMX file is stored) before using it.

回答9:

I've also experienced this problem with none of the classes being generated under the model.tt file. In my case it was down to issues with how I had built the DB in SQL2012. I'd set a column in a table to nullable that was also a foreign key and although I think you should be able to do this it caused a problem in EF5.

As soon as this was cleared and the diagram updated from the database they reappeared.

EF5 VS2013