Application can't scaffold items

Question

I created an MVC 5 application in VS 2013 Professional and then used EF 6.1 code first with an existing DB on SQL Server Express. When I try to create the views I’m using th

Answer 1

If by any chance you are following "Getting Started with Entity Framework 6 Code First using MVC 5" by Tom Dykstra.

I doubled check everything and my connection string is perfect. What I failed to realize was I copied another set of appSettings which I already have. Look below

  <appSettings>
    <add key="webpages:Version" value="3.0.0.0" />
    <add key="webpages:Enabled" value="false" />
    <add key="ClientValidationEnabled" value="true" />
    <add key="UnobtrusiveJavaScriptEnabled" value="true" />
  </appSettings>

My advice is to check every inch of Web.config and I'm sure that is the culprit.

Answer 2

I ran into this problem too using VS 2015. I tried all the other solutions here to no success. It turned out that my connection string (although formed exactly how MS tells us to form it) needed double \ to work properly.

Here is what it was that was NOT working:

<add name="DefaultConnection" connectionString="Data Source=(LocalDb)\V11.0;AttachDbFilename=|DataDirectory|\SquashSpiderDB.mdf;Initial Catalog=SquashSpiderDB;Integrated Security=True" providerName="System.Data.SqlClient" />

and here is what I changed it to in order to get the code generator to work:

<add name="DefaultConnection" connectionString="Data Source=(LocalDb)\\V11.0;AttachDbFilename=|DataDirectory|\SquashSpiderDB.mdf;Initial Catalog=SquashSpiderDB;Integrated Security=True" providerName="System.Data.SqlClient" />

Notice the double \ characters in front of V11.0 and the database name.

Hope this saves somebody else some time.

UPDATE

This gets the code generation to work, but then the app won't run because the \V11.0 isn't a valid connection string. This looks to me like MS has a bug in their code generation when it parses the connection string. I had to change it back to a single \ after I ran the code generation to get the app working again.

UPDATE 2

After some more digging by my partner, we found out that what was really screwing up code generation was the fact that we had changed the "Initial Catalog" field. When the project was created by the Wizard, it automatically set the Initial Catalog to aspnet--. We had then changed this Initial Catalog field to be DB. This worked great for the application running. It could get to the database just fine. But for some reason this screws up the code scaffolding generation. By putting the Initial Catalog back to what it was before (the aspnet--, the scaffolding started to work again (without needing the \V11.0).

Hope that helps somebody in the future.

Answer 3

Using: VS 2015 Community Edition and EF 6.1.3 Implemented also: Seed method, with a personalized class, and configured in the web.config file to run every time that the model changes. This seems to be related to some misconfiguration in the web.config file, in my case, like some of the cases I see in this post with other sections of the file, the section was repeated with different content, but it's repeated the main tag of course. The case of the section out of place, over the section, is also cause of the same behavior and narrow message while try to scaffold.

Answer 4

This solved the issue for me,

Adding throwIfV1Schema: false to base of DbContext

As so:

public MyDbContext() : base("ConectionStringName", throwIfV1Schema: false) { }

Answer 5

This may help resolve your error.

In my OnModelCreating i was doing this for each entity:

modelBuilder.Configurations.Add(new EntityTypeConfiguration<EntityModel>);

When i changed it to the following i stopped getting the error you are receiving.

modelBuilder.Entity<EntityModel>();

Answer 6

Check relationships between entities or other model design problem. For testing, create new class model without no relationship and use Scaffold to generate controllers and views. Works for me.