public void SearchFC(FeatureClass featureClass, IReadOnlyList<long> objectIDs)
{
      QueryFilter queryFilter = new QueryFilter()
      {
        ObjectIDs = objectIDs
      };

      using (RowCursor rowCursor = featureClass.Search(queryFilter))
      {
        while (rowCursor.MoveNext())
        {
          using (Feature feature = rowCursor.Current as Feature)
          {
            // use feature
          }
        }
      }
}