BrightIdeasSoftware.ObjectListView.BuildList C# (CSharp) Method

        public virtual void BuildList(bool shouldPreserveState)
        {
            if (this.Frozen)
                return;

            this.ApplyExtendedStyles();
            this.ClearHotItem();
            int previousTopIndex = this.TopItemIndex;
            Point currentScrollPosition = this.LowLevelScrollPosition;

            IList previousSelection = new ArrayList();
            Object previousFocus = null;
            if (shouldPreserveState && this.objects != null) {
                previousSelection = this.SelectedObjects;
                OLVListItem focusedItem = this.FocusedItem as OLVListItem;
                if (focusedItem != null)
                    previousFocus = focusedItem.RowObject;
            }

            IEnumerable objectsToDisplay = this.FilteredObjects;

            this.BeginUpdate();
            try {
                this.Items.Clear();
                this.ListViewItemSorter = null;

                if (objectsToDisplay != null) {
                    // Build a list of all our items and then display them. (Building
                    // a list and then doing one AddRange is about 10-15% faster than individual adds)
                    List<ListViewItem> itemList = new List<ListViewItem>(); // use ListViewItem to avoid co-variant conversion
                    foreach (object rowObject in objectsToDisplay) {
                        OLVListItem lvi = new OLVListItem(rowObject);
                        this.FillInValues(lvi, rowObject);
                        itemList.Add(lvi);
                    }
                    this.Items.AddRange(itemList.ToArray());
                    this.Sort();

                    if (shouldPreserveState) {
                        this.SelectedObjects = previousSelection;
                        this.FocusedItem = this.ModelToItem(previousFocus);
                    }

                    this.RefreshHotItem();
                }
            } finally {
                this.EndUpdate();
            }

            // We can only restore the scroll position after the EndUpdate() because
            // of caching that the ListView does internally during a BeginUpdate/EndUpdate pair.
            if (shouldPreserveState) {
                this.RefreshHotItem();

                // Restore the scroll position. TopItemIndex is best, but doesn't work
                // when the control is grouped.
                if (this.ShowGroups)
                    this.LowLevelScroll(currentScrollPosition.X, currentScrollPosition.Y);
                else
                    this.TopItemIndex = previousTopIndex;

            }
        }