Exposing a custom type as a JSON string in an ASP.NET Core API

(Thomas Levesque) Sometimes your API needs to expose a non-primitive type that has a “natural” string representation. For instance, a standard representation for a duration is the ISO 8601 format, where “1 month, 2 days, 3 hours and 4 minutes” can be represented as P1M2DT3H4M (note that this isn’t t

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