asp.net核心如何在运行时从实体框架更改连接字符串(登录后)

"ConnectionStrings": {
  "DefaultConnection": "Server=(localdb)\\mssqllocaldb;Database=MyDatabase;Trusted_Connection=True;"
}

services.AddDbContext<ApplicationDbContext>(options =>
    options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));

private readonly ApplicationDbContext _context;
private readonly DbContextOptions<ApplicationDbContext> _options;

public MyController(ApplicationDbContext context, DbContextOptions<ApplicationDbContext> options)
{
    _context = context;
    _options = options;
}

public IActionResult ChangeConnectionString()
{
    var builder = new DbContextOptionsBuilder<ApplicationDbContext>(_options);
    builder.UseSqlServer("Server=NewServer;Database=NewDatabase;Trusted_Connection=True;");
    var newOptions = builder.Options;

    using (var newContext = new ApplicationDbContext(newOptions))
    {
        // 使用新的数据库上下文进行操作
    }

    return Ok();
}