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    <p>Two things you might try:</p> <p>Implement a try/parse model:</p> <pre><code>public class Organisation { public string Name { get; set; } [JsonConverter(typeof(RichDudeConverter))] public IPerson Owner { get; set; } } public interface IPerson { string Name { get; set; } } public class Tycoon : IPerson { public string Name { get; set; } } public class Magnate : IPerson { public string Name { get; set; } public string IndustryName { get; set; } } public class Heir: IPerson { public string Name { get; set; } public IPerson Benefactor { get; set; } } public class RichDudeConverter : JsonConverter { public override bool CanConvert(Type objectType) { return (objectType == typeof(IPerson)); } public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer) { // pseudo-code object richDude = serializer.Deserialize&lt;Heir&gt;(reader); if (richDude == null) { richDude = serializer.Deserialize&lt;Magnate&gt;(reader); } if (richDude == null) { richDude = serializer.Deserialize&lt;Tycoon&gt;(reader); } return richDude; } public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer) { // Left as an exercise to the reader :) throw new NotImplementedException(); } } </code></pre> <p>Or, if you can do so in your object model, implement a concrete base class between IPerson and your leaf objects, and deserialize to it. </p> <p>The first can potentially fail at runtime, the second requires changes to your object model and homogenizes the output to the lowest common denominator.</p>
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    1. POCasting interfaces for deserialization in JSON.NET
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    1. USmcw0933
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    1. COA try/parse model isn't feasible due to the scale I have to work with. I have to consider a scope of hundreds of base objects with even more hundreds of stub/helper objects to represent embedded JSON objects that happen a lot. It's not out of the question to change the object model, but wouldn't using a concrete base class in the properties make us unable to mock items for unit testing? Or am I getting that backward somehow?
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    2. COYou could still implement a mock from IPerson - note that the type of the Organisation.Owner property is still IPerson. But for deserialization of an arbitrary target you have to return a concrete type. If you don't own the type definition and you can't define the minimum set of properties that your code will require, then your last resort is something like a key/value bag. Using your facebook example comment - can you post in an answer what your (one or multiple) implementations of ILocation look like? That may help move things forward.
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    3. COSince the primary hope is mocking, the ILocation interface is, really, merely a facade for the Location concrete object. A quick example I just worked up would be something like this (http://pastebin.com/mWQtqGnB) for the interface and this (http://pastebin.com/TdJ6cqWV) for the concrete object.
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