private static IEnumerable <IGrouping <string, FolderTreeItem> > CreateGrouping_AllItems(FolderItem rootFolder)
{
return
//From root folder ...
(rootFolder
//Select all descendant files and folders ...
.DescendantItems()
//Then order the items by item path ...
.OrderBy(item => item.ItemPath)
//And put all of them in a single group
.GroupBy(item => "All Items"));
}
private static IEnumerable <IGrouping <string, FolderTreeItem> > CreateGrouping_Keywords(FolderItem rootFolder)
{
return
//From root folder ...
(rootFolder
//Select all descendant files and folders ...
.DescendantItems()
//Then order the items by item path ...
.OrderBy(item => item.ItemPath)
//For each item, get the keywords in its name as a set of distinct
//FolderTreeItemAttribute<string> objects and flatten the objects into a single list
.SelectMany(item => item.ItemNameKeywords())
//Then group all items by the keywords
.GroupBy(itemAttr => itemAttr.Value, itemAttr => itemAttr.Item)
//Then order the groups by thier keys
.OrderBy(item => item.Key));
}