我已经完成了Berezh分享的代码。

public class TreeNode<T> : IEnumerable<TreeNode<T>>
{
    public T Data { get; set; }
    public TreeNode<T> Parent { get; set; }
    public ICollection<TreeNode<T>> Children { get; set; }

    public TreeNode(T data)
    {
        this.Data = data;
        this.Children = new LinkedList<TreeNode<T>>();
    }

    public TreeNode<T> AddChild(T child)
    {
        TreeNode<T> childNode = new TreeNode<T>(child) { Parent = this };
        this.Children.Add(childNode);
        return childNode;
    }

    public IEnumerator<TreeNode<T>> GetEnumerator()
    {
        throw new NotImplementedException();
    }

    IEnumerator IEnumerable.GetEnumerator()
    {
        return (IEnumerator)GetEnumerator();
    }
}

public class TreeNodeEnum<T> : IEnumerator<TreeNode<T>>
{

    int position = -1;
    public List<TreeNode<T>> Nodes { get; set; }

    public TreeNode<T> Current
    {
        get
        {
            try
            {
                return Nodes[position];
            }
            catch (IndexOutOfRangeException)
            {
                throw new InvalidOperationException();
            }
        }
    }

    object IEnumerator.Current
    {
        get
        {
            return Current;
        }
    }

    public TreeNodeEnum(List<TreeNode<T>> nodes)
    {
        Nodes = nodes;
    }

    public void Dispose()
    {

    }

    public bool MoveNext()
    {
        position++;
        return (position < Nodes.Count);
    }

    public void Reset()
    {
        position = -1;
    }
}

如果你需要一个使用较少内存的根树数据结构实现，你可以这样写你的Node类(c++实现):

class Node {
       Node* parent;
       int item; // depending on your needs

       Node* firstChild; //pointer to left most child of node
       Node* nextSibling; //pointer to the sibling to the right
}

我不喜欢树的方法。它使事情变得过于复杂，包括搜索或下钻，甚至ui控件填充。

我建议使用dictionary <TChild, TParent>这种非常简单的方法。这也允许节点或级别之间没有连接。

还有另一种树结构:

public class TreeNode<T> : IEnumerable<TreeNode<T>>
{

    public T Data { get; set; }
    public TreeNode<T> Parent { get; set; }
    public ICollection<TreeNode<T>> Children { get; set; }

    public TreeNode(T data)
    {
        this.Data = data;
        this.Children = new LinkedList<TreeNode<T>>();
    }

    public TreeNode<T> AddChild(T child)
    {
        TreeNode<T> childNode = new TreeNode<T>(child) { Parent = this };
        this.Children.Add(childNode);
        return childNode;
    }

    ... // for iterator details see below link
}

示例用法:

TreeNode<string> root = new TreeNode<string>("root");
{
    TreeNode<string> node0 = root.AddChild("node0");
    TreeNode<string> node1 = root.AddChild("node1");
    TreeNode<string> node2 = root.AddChild("node2");
    {
        TreeNode<string> node20 = node2.AddChild(null);
        TreeNode<string> node21 = node2.AddChild("node21");
        {
            TreeNode<string> node210 = node21.AddChild("node210");
            TreeNode<string> node211 = node21.AddChild("node211");
        }
    }
    TreeNode<string> node3 = root.AddChild("node3");
    {
        TreeNode<string> node30 = node3.AddChild("node30");
    }
}

奖金 见羽翼丰满的树与:

迭代器 搜索 Java / c#

https://github.com/gt4dev/yet-another-tree-structure

这是我的，和艾伦·盖奇的很相似，只是在我看来更传统一点。就我而言，我使用List<T>时没有遇到任何性能问题。如果需要，切换到LinkedList是很容易的。

namespace Overby.Collections
{
    public class TreeNode<T>
    {
        private readonly T _value;
        private readonly List<TreeNode<T>> _children = new List<TreeNode<T>>();

        public TreeNode(T value)
        {
            _value = value;
        }

        public TreeNode<T> this[int i]
        {
            get { return _children[i]; }
        }

        public TreeNode<T> Parent { get; private set; }

        public T Value { get { return _value; } }

        public ReadOnlyCollection<TreeNode<T>> Children
        {
            get { return _children.AsReadOnly(); }
        }

        public TreeNode<T> AddChild(T value)
        {
            var node = new TreeNode<T>(value) {Parent = this};
            _children.Add(node);
            return node;
        }

        public TreeNode<T>[] AddChildren(params T[] values)
        {
            return values.Select(AddChild).ToArray();
        }

        public bool RemoveChild(TreeNode<T> node)
        {
            return _children.Remove(node);
        }

        public void Traverse(Action<T> action)
        {
            action(Value);
            foreach (var child in _children)
                child.Traverse(action);
        }

        public IEnumerable<T> Flatten()
        {
            return new[] {Value}.Concat(_children.SelectMany(x => x.Flatten()));
        }
    }
}

有现在发布的。net代码库:具体来说，实现红黑树的SortedSet代码:SortedSet .cs

然而，这是一个平衡的树形结构。因此，我的答案更多的是参考。net核心库中唯一的原生树结构。