BrightIdeasSoftware.ObjectListView.DoSort C# (CSharp) Method

        private void DoSort(OLVColumn columnToSort, SortOrder order)
        {
            // Sanity checks
            if (this.GetItemCount() == 0 || this.Columns.Count == 0)
                return;

            // Fill in default values, if the parameters don't make sense
            if (this.ShowGroups) {
                columnToSort = columnToSort ?? this.GetColumn(0);
                if (order == SortOrder.None) {
                    order = this.Sorting;
                    if (order == SortOrder.None)
                        order = SortOrder.Ascending;
                }
            }

            // Give the world a chance to fiddle with or completely avoid the sorting process
            BeforeSortingEventArgs args = this.BuildBeforeSortingEventArgs(columnToSort, order);
            this.OnBeforeSorting(args);
            if (args.Canceled)
                return;

            // Virtual lists don't preserve selection, so we have to do it specifically
            // THINK: Do we need to preserve focus too?
            IList selection = this.VirtualMode ? this.SelectedObjects : null;

            this.ClearHotItem();

            // Finally, do the work of sorting, unless an event handler has already done the sorting for us
            if (!args.Handled) {
                // Sanity checks
                if (args.ColumnToSort != null && args.SortOrder != SortOrder.None) {
                    if (this.ShowGroups)
                        this.BuildGroups(args.ColumnToGroupBy, args.GroupByOrder, args.ColumnToSort, args.SortOrder,
                            args.SecondaryColumnToSort, args.SecondarySortOrder);
                    else if (this.CustomSorter != null)
                        this.CustomSorter(args.ColumnToSort, args.SortOrder);
                    else
                        this.ListViewItemSorter = new ColumnComparer(args.ColumnToSort, args.SortOrder,
                            args.SecondaryColumnToSort, args.SecondarySortOrder);
                }
            }

            if (this.ShowSortIndicators)
                this.ShowSortIndicator(args.ColumnToSort, args.SortOrder);

            this.LastSortColumn = args.ColumnToSort;
            this.LastSortOrder = args.SortOrder;

            if (selection != null && selection.Count > 0)
                this.SelectedObjects = selection;

            this.RefreshHotItem();

            this.OnAfterSorting(new AfterSortingEventArgs(args));
        }