DD.WellWorkover.Cloud/AsbCloudApp/Tree.cs

using System.Collections.Generic;

namespace AsbCloudApp
{
    public class Tree<T> : Dictionary<T, Tree<T>>
    {
        public Tree()
        { }

        public Tree(T key, Tree<T> node = null)
        {
            Add(key, node);
        }

        public Tree(Tree<T> other)
            : base(other)
        { }

        public Tree(IEnumerable<T> keys)
        {
            foreach (var key in keys)
                Add(key);
        }

        public void Add(T key) => Add(key, null);
    }
}