C# anonymous object with properties from dictionary

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You can’t, basically. Anonymous types are created by the compiler, so they exist in your assembly with all the property names baked into them. (The property types aren’t a problem in this case – as an implementation detail, the compiler creates a generic type and then creates an instance of that using appropriate type arguments.)

You’re asking for a type with properties which are determined at execution time – which just doesn’t fit with how anonymous types work. You’d have to basically compile code using it at execution time – which would then be a pain as it would be in a different assembly, and anonymous types are internal…

Perhaps you should use ExpandoObject instead? Then anything using dynamic will be able to access the properties as normal.

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