EssentialsPlugin.Utility.GridGroup.GetGroups C# (CSharp) Method

        public static HashSet<GridGroup> GetGroups( HashSet<MyEntity> entities, GridLinkTypeEnum linkType = GridLinkTypeEnum.Logical )
        {
            HashSet<GridGroup> result = new HashSet<GridGroup>();

            //Create a copy of the entities list;
            //group processing can take so long that the internal list of entities can change
            //which is Bad.
            MyEntity[] entitiesCopy = new MyEntity[entities.Count];
            entities.CopyTo( entitiesCopy );

                //on large servers this can run into the tens of seconds, so parallelize it
            Parallel.ForEach( entitiesCopy, ( entity ) =>
                                            {
                                                MyCubeGrid grid = entity as MyCubeGrid;

                                                if (grid?.Physics == null || grid.Closed)
                                                    return;

                                                lock (result)
                                                    foreach(var item in result)
                                                        if ( item._grids.Contains( grid ) )
                                                            return;

                                                var newGroup = new GridGroup( grid, linkType );

                                                lock (result)
                                                    result.Add( newGroup );
                                            } );

            return result;
        }