实体框架迁移无法在App.config文件中找到连接字符串

Question

I have a second project in my solution called DataAccess (.NET Framework Class Library) for models. I set my main asp .net mvc project as start up and from package manager console I set DataAccess as default. I already have an existing database. So I installed Entity Framework in DataAccess layer using package-install command to get the latest. Then I added an Entity Data Model. But whenever I try to run enable-migrations from PM it shows that No connection string named 'MAHMHEntities' could be found in the application config file. Although there is a connectionString in App.config called MAHMHEntities . In my MAHMHEntities.cs class I have declared the connection string:

namespace DataAccess.Entities
{
  using System.Data.Entity;

  public partial class MAHMHEntities : DbContext
  {
    public MAHMHEntities()
        : base("name=MAHMHEntities")
    {
    }  
    //other dbset classes
  }  
}  

In DataAccess layer I have App.config file that has two connectionString, I added the DefaultConnection myself :

<connectionStrings>
  <add name="DefaultConnection" connectionString="Data Source=.\SQL2014;Initial Catalog=MAHMH;Integrated Security=SSPI" providerName="System.Data.SqlClient" />
  <add name="MAHMHEntities" connectionString="data source=.\SQL2014;initial catalog=MAHMH;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework" providerName="System.Data.SqlClient" />  
</connectionStrings>  

Whichever connection I use I always get the same error when I try to enable migration. Entity Framework version is 6.2.0.

Answer 1

You need to set Data access project as start up project. Or you can add your connection string to web application's(Which is currently start up project) web.config