Nsryjdtyk

I have a class library with the next structure:

namespace Layers

{

  public class DatabaseLayer 

  {

      private Database _database;



      public string ConnectionString {get; set; }

  }

}



namespace Models

{

  public class DatabaseBase : DbContext, IDisposable

  {

    private DbConnection _connection;

    private DbCommand _command;



    public string ConnectionString {get; set; }

  }



  public class Database : DatabaseBase

  {

    internal Database(string connectionString) : base(connectionString) { }



    public virtual DbSet<FileEntity> Files { get; set; }

  }

}

I added an implementation of IDesignTimeDbContextFactory interface to avoid message Unable to create an object of type 'Database'. Add an implementation of 'IDesignTimeDbContextFactory' to the project:

namespace Models

{

  public class DesignTimeDbContextFactory : IDesignTimeDbContextFactory<Database>

  {

    public Database CreateDbContext(string args)

    {

        var builder = new DbContextOptionsBuilder<Database>();

        var connectionString = @"Server=MyInstanceName;Database=MyDatabaseName;Trusted_Connection=True;";



        builder.UseSqlServer(connectionString, b => b.MigrationsAssembly("MyAssemblyName"));



        return new Database(builder.Options.ToString());

    }

  }

}

When I try to run update-database -Context Database, I get

System.ArgumentException: Format of the initialization string does not
conform to specification starting at index 0. at
System.Data.Common.DbConnectionOptions.GetKeyValuePair(String
connectionString, Int32 currentPosition, StringBuilder buffer, Boolean
useOdbcRules, String& keyname, String& keyvalue) at
System.Data.Common.DbConnectionOptions.ParseInternal(Dictionary2
parsetable, String connectionString, Boolean buildChain, Dictionary2
synonyms, Boolean firstKey) at
System.Data.Common.DbConnectionOptions..ctor(String connectionString,
Dictionary`2 synonyms)

It is obviously the problem is in my connectionString, but I copied it from testing project as-is and it works well there (connections test are passed).

What can I miss? I'm using EF Core and .NET Core 2.1.

Edit
I'm running my code under debugger and see there is wrong connection string sends to Database constructor:

The selected line contains right connection string and the next one - no. So my question should sound how to send connection string from DbContextOptionsBuilder to DbContext constructor correctly.

Edit2:
I can make it work by replacing

return new Database(builder.Options.ToString());

with

return new Database((builder.Options.Extensions.First() as 

  SqlServerOptionsExtension).ConnectionString.ToString());

in CreateDbContext, but I'm not sure this is a proper way...