使用IdentityDBContext代码首次迁移时出现连接字符串错误

Question

我正在尝试执行代码优先实体框架迁移。 但是当我尝试运行时，我遇到连接字符串错误。

我的网络配置文件中的连接字符串是

 <connectionStrings>
    <add name="AuthContext" connectionString="Data Source=(localdb)\v11.0;Initial Catalog=owinAuthentication;Integrated Security=True" providerName="System.Data.SqlClient" />
  </connectionStrings>

我的AuthContext.cs是

using System.Data.Entity;
using System.Linq;
using System.Web;

namespace owinAuthentication
{
    public class AuthContext : IdentityDbContext<IdentityUser>
    {
        public AuthContext()  
            : base("AuthContext")
        {
            Database.SetInitializer(new MigrateDatabaseToLatestVersion<AuthContext, Migrations.Configuration>(ConfigurationManager.ConnectionStrings["AuthContext"].ConnectionString));
        }
        public DbSet<Client> Clients { get; set; }
        public DbSet<RefreshToken> RefreshTokens { get; set; }
    }
}

然而，当我运行我的应用程序时，我正在接收。

System.InvalidOperationException was unhandled by user code
  HResult=-2146233079
  Message=No connection string named 'Data Source=(localdb)\v11.0;Initial Catalog=owinAuthentication;Integrated Security=True' could be found in the application config file.
  Source=EntityFramework
  StackTrace:
       at System.Data.Entity.Infrastructure.DbConnectionInfo.GetConnectionString(AppConfig config)
       at System.Data.Entity.Internal.LazyInternalConnection.get_ConnectionHasModel()
       at System.Data.Entity.Internal.LazyInternalContext.OverrideConnection(IInternalConnection connection)
       at System.Data.Entity.Infrastructure.DbContextInfo.ConfigureContext(DbContext context)
       at System.Data.Entity.Internal.InternalContext.ApplyContextInfo(DbContextInfo info)
       at System.Data.Entity.Internal.LazyInternalContext.InitializeContext()
       at System.Data.Entity.Internal.InternalContext.CreateObjectContextForDdlOps()
       at System.Data.Entity.Database.Exists()
       at Microsoft.AspNet.Identity.EntityFramework.IdentityDbContext`1.IsIdentityV1Schema(DbContext db)
       at Microsoft.AspNet.Identity.EntityFramework.IdentityDbContext`1..ctor(String nameOrConnectionString, Boolean throwIfV1Schema)
       at Microsoft.AspNet.Identity.EntityFramework.IdentityDbContext`1..ctor(String nameOrConnectionString)
       at owinAuthentication.AuthContext..ctor() in C:\Users\delli\Documents\Visual Studio 2015\Projects\owinAuthentication\owinAuthentication\Models\AuthContext.cs:line 15
  InnerException: 

查看其他堆栈溢出答案我尝试更改

 : base("AuthContext")

到

: base(ConfigurationManager.ConnectionStrings["AuthContext"].ConnectionString));

但仍然收到错误。