Repo of Repos

Program.cs

var repoRepos = new RepositoryRepository();
var pageRepo0 = repoRepos.GetRepository<IPage>();
var pageRepo1 = repoRepos.GetRepository<IPage>();

class RepositoryRepository
{
  readonly List<IBaseRepository> _repos = new();

  IBaseRepository CreateRepository(Type t)
  {
    if (t == typeof(IPage)) return new PageRepository();
    throw new ArgumentException($"Unexpected type: {t.FullName}");
  }

  public void CommitAll()
  {
    foreach (var repo in _repos)
    {
      repo.Commit();
    }
  }

  public void RollbackAll()
  {
    foreach (var repo in _repos)
    {
      repo.Rollback();
    }
  }

  public IBaseRepository<T> GetRepository<T>()
    where T : IBaseType
  {
    var repo = CreateRepository(typeof(T));
    _repos.Add(repo);
    return (IBaseRepository<T>)repo;
  }
}

interface IBaseType
{
}

interface IBaseRepository
{
  void Commit();
  void Rollback();
}

interface IBaseRepository<T> : IBaseRepository
  where T : IBaseType
{
  T Get();
}

interface IPage : IBaseType
{
}

interface IPageRepository : IBaseRepository<IPage>
{
}

sealed class Page : IPage
{
}

sealed class PageRepository : IPageRepository
{
  public void Commit()
  {
  }

  public IPage Get()
  {
    return new Page();
  }

  public void Rollback()
  {
  }
}