Convert a list of paths into its corresponding hierarchical tree (in XML). Can be used for webpages.

GetTreeView.cs

// This method accepts a list of strings, where each string is a path (eg. "home/user/max/pic.png")
// and creates a hierarchical XML tree out of them

using System.Collections.Generic;
using System.Xml.Linq;
using System.Linq;

public string GetTreeViewXml(List<string> paths)
{
    XDocument doc = new XDocument(new XElement("ul"));
    XElement currentNode, nextNode;

    foreach (string path in paths)
    {
        string[] asArray = path.Split('/');
        int depth = asArray.Length;

        currentNode = doc.Root;

        for (int i = 0; i < depth; i++)
        {
            string directory = asArray[i];

            nextNode = (from elem in currentNode.Elements("li") where elem.Nodes().OfType<XText>().First().Value == directory select elem.Element("ul")).FirstOrDefault();

            /* this foreach does the same thing as previous line
             foreach (var elem in currentNode.Elements("li"))
                {
                if (elem.Nodes().OfType<XText>().First().Value == directory)
                {
                    nextNode = elem.Element("ul");
                    break;
                }
            } */

            if (nextNode == null)
            {
                var newChild = new XElement("li", directory);
                currentNode.Add(newChild);

                if (i == depth - 1)
                    break;

                newChild.Add(new XElement("ul"));
                nextNode = newChild.Element(("ul"));
            }

            currentNode = nextNode;
        }
    }

    return doc.ToString();
}