public IEnumerable<Item> GetItems()

{
  // Get all the items that can be accessed from a folder connection. The items immediately 
  // contained by a folder, that is, the folder's children, are returned including folders
  // and individual items that can be used in ArcGIS Pro. This method does not return all 
  // items contained by any sub-folder that can be accessed from the folder connection.
  FolderConnectionProjectItem folderConnection = Project.Current.GetItems<FolderConnectionProjectItem>()
                                                      .FirstOrDefault(folder => folder.Name.Equals("Data"));
  //Note: Needs QueuedTask to run
  IEnumerable<Item> folderContents = folderConnection.GetItems();
}

{
  await QueuedTask.Run(() =>
  {
    IEnumerable<GDBProjectItem> gdbProjectItems = Project.Current.GetItems<GDBProjectItem>();

    foreach (GDBProjectItem gdbProjectItem in gdbProjectItems)
    {
      using (Datastore datastore = gdbProjectItem.GetDatastore())
      {
        //Unsupported datastores (non File GDB and non Enterprise GDB) will be of type UnknownDatastore
        if (datastore is UnknownDatastore)
          continue;

        Geodatabase geodatabase = datastore as Geodatabase;
        // Use the geodatabase.
      }
    }
  });
}