要将连接字符串移动到appsettings.json文件中，需要在context类中进行哪些更改

public class MyDbContext : DbContext
{
    private readonly IConfiguration _configuration;

    public MyDbContext(IConfiguration configuration)
    {
        _configuration = configuration;
    }

    // ...
}

public class MyDbContext : DbContext
{
    private readonly IConfiguration _configuration;

    public MyDbContext(IConfiguration configuration)
    {
        _configuration = configuration;
    }

    public string ConnectionString => _configuration.GetConnectionString("DefaultConnection");

    // ...
}

{
  "ConnectionStrings": {
    "DefaultConnection": "Server=myServerAddress;Database=myDatabase;User Id=myUsername;Password=myPassword;"
  }
}

public class MyController : Controller
{
    private readonly MyDbContext _dbContext;

    public MyController(MyDbContext dbContext)
    {
        _dbContext = dbContext;
    }

    // ...
}