BrightIdeasSoftware.ObjectListView.BuildGroups C# (CSharp) Method

        public virtual void BuildGroups(OLVColumn groupByColumn, SortOrder groupByOrder,
            OLVColumn column, SortOrder order, OLVColumn secondaryColumn, SortOrder secondaryOrder)
        {
            // Sanity checks
            if (groupByColumn == null)
                return;

            // Getting the Count forces any internal cache of the ListView to be flushed. Without
            // this, iterating over the Items will not work correctly if the ListView handle
            // has not yet been created.
            #pragma warning disable 168
            int dummy = this.Items.Count;
            #pragma warning restore 168

            // Collect all the information that governs the creation of groups
            GroupingParameters parms = this.CollectGroupingParameters(groupByColumn, groupByOrder,
                column, order, secondaryColumn, secondaryOrder);

            // Trigger an event to let the world create groups if they want
            CreateGroupsEventArgs args = new CreateGroupsEventArgs(parms);
            if (parms.GroupByColumn != null)
                args.Canceled = !parms.GroupByColumn.Groupable;
            this.OnBeforeCreatingGroups(args);
            if (args.Canceled)
                return;

            // If the event didn't create them for us, use our default strategy
            if (args.Groups == null)
                args.Groups = this.MakeGroups(parms);

            // Give the world a chance to munge the groups before they are created
            this.OnAboutToCreateGroups(args);
            if (args.Canceled)
                return;

            // Create the groups now
            this.OLVGroups = args.Groups;
            this.CreateGroups(args.Groups);

            // Tell the world that new groups have been created
            this.OnAfterCreatingGroups(args);
        }