EntityFramework 26 error with LocalDb and IndentityDbContext

Question

I am creating a C # DataAccess class library for an MVC application. Inside the class library, I use EntityFramework and ASP.NET Identity.

When I try to run Database Update or Add-Migration in the class library, I get an error.

Error 26:A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible.

My UserAccount class derived from IdentityUser is below:

public class UserAccount : IdentityUser
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }

        public virtual Address Address { get; set; }
        public virtual PaymentDetail PaymentDetail { get; set; }

        public virtual MediaResource ProfilePicture { get; set; }
        public virtual ICollection<Conversation> Conversations { get; set; }
    }

An implementation of my context class uses this constructor:

public class LouderContext : IdentityDbContext<UserAccount>
    {

        public LouderContext("DefaultConnection") { }

The contents of my App.config file are as follows:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>

    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
  </configSections>
  <connectionStrings>
    <add name="DefaultConnection" connectionString="Data Source=(localdb)\MSSQLLocalDB;Initial Catalog=master;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False" providerName="System.Data.SqlClient"/>
  </connectionStrings>
  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
      <parameters>
        <parameter value="v12.0" />
      </parameters>
    </defaultConnectionFactory>
    <providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
    </providers>
  </entityFramework>
</configuration>

Things I tried:

• Change factory connection parameter to mssqllocaldbor v12.0fromv11.0
• Restoring the installation of my visual studio
• SQL Server connectionstring App.config

(localdb)\MSSQLLocalDB SSMS . LocalDb MVC, , . ? - ?

Answer 1

EF , , , - MVC, , .

: DefaultConnection app.config web.config, DBContext , app.config. Ex: public LouderContext("AppConfigConnection") { }

:

Get-Help enable-migrations -detailed

-StartupProjectName:

-StartUpProjectName

Specifies the configuration file to use for named connection strings. If
omitted, the specified project configuration file is used.

, , . ( web.config app.config).

Answer 2

(.. base()), , app.config connectionstring DefaultConnection.