Recursive generic types

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Try:

class StringToDictionary : Dictionary<string, StringToDictionary> { }

Then you can write:

var stuff = new StringToDictionary
        {
            { "Fruit", new StringToDictionary
                {
                    { "Apple", null },
                    { "Banana", null },
                    { "Lemon", new StringToDictionary { { "Sharp", null } } }
                }
            },
        };

General principle for recursion: find some way to give a name to the recursive pattern, so it can refer to itself by name.

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