After upgrading our project from using Entity Framework 5 to Entity Framework 6 (though NuGets update function) i get the following error on my generated Entities class:
Error 1 The type or namespace name 'Objects' does not exist in the namespace 'System.Data'
(are you missing an assembly reference?)
I understand that this is because the namespace has changed and i can manually fix the error by changing my imports from:
However the file is generated so i need to reapply this fix after every
Update model from Database.
Is there something extra to change to get EF to generate the model without this error.
I think your problem is, that your T4 templates, which generate the entitties and the context are still in EF version 5.
First you have to delete the current code generation items, which are in the code behind of the model, namely
<Modelname>.tt.Next add a new EF version 6 code generator with
Right click in the model designer-> Add Code Generation Item ... -> EF 6.x DbContext Generator.
This is my experience on how to successfully upgrade Entity Framework v5 to v6 for:
using System.Data.EntityClient;, which is an EF5 reference.
using System.Data.Entity.Core.EntityClient;which is the correct for EF6.
Still stuck? This checklist is a Community Wiki, feel free to edit this checklist to help other hapless souls who are still banging their heads against the brick wall that can be EF6 configuration.
Please explore other options before considering EF. It's 100x slower than other options, it's vastly over complicated for what it delivers, the entity GUI is full of bugs and has weird usability issues, and we are going to have to rip out all of our EF6 code and replace it with something that takes less than 5 minutes to make a query that takes 5 seconds in Dapper.