hierarchy reader from stack overflow

NodeEntryCollection.cs

using System.Collections.Generic;

namespace util
{
    /// <summary>
    /// Storage and parsing of flat string based folder hierarchy.
    /// See http://stackoverflow.com/a/8621711/10245
    /// </summary>
    /// <example><code>
    /// NodeEntryCollection cItems = new NodeEntryCollection();
    /// cItems.AddEntry(sLine, 0);
    /// </code></example>
    public class NodeEntryCollection : Dictionary<string, NodeEntry>
    {
        public NodeEntryCollection()
        {
            Separator = "/"; // default separator
        }

        /// <summary>
        /// Gets or sets the separator used to split the hierarchy.
        /// </summary>
        /// <value>
        /// The separator.
        /// </value>
        public string Separator { get; set; }

        public void AddEntry(string entry)
        {
            AddEntry(entry, 0);
        }

        /// <summary>
        /// Parses and adds the entry to the hierarchy, creating any parent entries as required.
        /// </summary>
        /// <param name="entry">The entry.</param>
        /// <param name="startIndex">The start index.</param>
        public void AddEntry(string entry, int startIndex)
        {
            if (startIndex >= entry.Length)
            {
                return;
            }

            var endIndex = entry.IndexOf(Separator, startIndex);
            if (endIndex == -1)
            {
                endIndex = entry.Length;
            }
            var key = entry.Substring(startIndex, endIndex - startIndex);
            if (string.IsNullOrEmpty(key))
            {
                return;
            }

            NodeEntry item;
            if (ContainsKey(key))
            {
                item = this[key];
            }
            else
            {
                item = new NodeEntry { Key = key };
                Add(key, item);
            }
            // Now add the rest to the new item's children
            item.Children.AddEntry(entry, endIndex + 1);
        }
    }

    public class NodeEntry
    {
        public string Key { get; set; }

        public NodeEntryCollection Children { get; set; }

        public NodeEntry()
        {
            Children = new NodeEntryCollection();
        }
    }
}