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Typically with something like this it will be a one time effort because the code produced is what enables the development time tools like intellisense. .Net does have run time code generation options but unfortunately we don't have support in the tool chain to tie them back to these sorts of tools.

It is possible to create class dynamically in C#. Although I don't know whether this library is doing it.

Dynamic support is present in .NET/C# as of version 4.0. Consuming JSON in applications written or currently running on prior versions leaves one with little choice than writing static types to deserialize to.