.NET中的嵌套字典集合

Question

.NET Dictionary<TKey, TValue>对象允许分配键/值,如下所示:

Dictionary<string, string> dict = new Dictionary<string, string>();
dict["1"] = "foo";
dict["2"] = "bar";

但我不能像这样使用字典:

Dictionary<string, string> dict = new Dictionary<string, string>();
dict["F1"]["F2"]["F3"] = "foo";
dict["2"]["X"] = "bar";

.NET中有一个允许我嵌套的集合[],还是我必须创建自己的集合？

如果我必须创建自己的,我该怎么做？

编辑:

如果我可以实现期望唯一键的实现也是有用的,如下所示:

dict["F1"]["F2"]["F3"] = "foo";
dict["F1"]["F2"]["F3"] = "bar"; //result is "bar" because "foo" was overridden

以及可以多次使用密钥的实现

dict["F1"]["F2"]["F3"] = "foo";
dict["F1"]["F2"]["F3"] = "bar"; //result can be "foo" and "bar"

这可能吗？

编辑(根据Jon Skeet的提问):

我想使用这样的结构(作为一个非常粗略的例子):

json["data"]["request"]["name"] = "username";
json["data"]["request"]["pass"] = "password";

解决了

{ data: { request: { name: "username", pass: "password" } } }

并且同样会有XML等效的等价物.

Answer 1

根据我的测试,我已经提出了以下解决方案,据我所知,这个解决方案没有中断.

public class NestedDictionary<K, V> : Dictionary<K, NestedDictionary<K, V>>
    {
        public V Value { set; get; }

        public new NestedDictionary<K, V> this[K key]
        {
            set { base[key] = value; }

            get
            {
                if (!base.Keys.Contains<K>(key))
                {
                    base[key] = new NestedDictionary<K, V>();
                }
                return base[key];
            }
        }
    }

测试:

NestedDictionary<string, string> dict = new NestedDictionary<string, string>();
dict["one"].Value = "Nest level 1";
dict["one"]["two"]["three"].Value = "Nest level 3";
dict["FieldA"]["FieldB"].Value = "Hello World";

Console.WriteLine(dict["one"].Value);
Console.WriteLine(dict["one"]["two"]["three"].Value);
Console.WriteLine(dict["FieldA"]["FieldB"].Value);

Answer 2

您可以使用标准Dictionary执行此操作,您只需声明嵌套:

Dictionary<string, Dictionary<string, string>> dict = ...
string test = dict["first"]["second"]

Dictionary<string, Dictionary<string, Dictionary<string, string>>> dict = ...
string test = dict["first"]["second"]["third"]

etc