How should anonymous types be used in C#?

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Anonymous types have nothing to do with the design of systems or even at the class level. They’re a tool for developers to use when coding.

I don’t even treat anonymous types as types per-se. I use them mainly as method-level anonymous tuples. If I query the database and then manipulate the results, I would rather create an anonymous type and use that rather than declare a whole new type that will never be used or known outside of the scope of my method.

For instance:

var query = from item in database.Items
            // ...
            select new { Id = item.Id, Name = item.Name };

return query.ToDictionary(item => item.Id, item => item.Name);

Nobody cares about `a, the anonymous type. It’s there so you don’t have to declare another class.

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