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    <p>Make sure you specify TypeNameHandling when deserializing, as per the docs:</p> <pre><code>// for security TypeNameHandling is required when deserializing Stockholder newStockholder = JsonConvert.DeserializeObject&lt;Stockholder&gt;(jsonTypeNameAuto, new JsonSerializerSettings { TypeNameHandling = TypeNameHandling.Auto }); </code></pre> <p>It is worth noting that the documentation is deserializing a Concrete class that <strong>contains</strong> a collection of Abstract classes.</p> <p>As an experiment try creating a throw-away class (concrete) that has a single property with your list of abstract objects and see if you can serialize and deserialize that.</p> <p><strong>UPDATE:</strong></p> <p>I just tested the following code in LINQPad:</p> <pre><code>void Main() { var test = new List&lt;Business&gt;(); test.Add(new Hotel { Name = "Hilton", Stars = 5 }); test.Add(new Pool { Name = "Big Splash", Capacity = 500 }); test.Dump(); string json = JsonConvert.SerializeObject(test, Newtonsoft.Json.Formatting.Indented, new JsonSerializerSettings { TypeNameHandling = TypeNameHandling.All }); json.Dump(); var businesses = JsonConvert.DeserializeObject&lt;List&lt;Business&gt;&gt;(json, new JsonSerializerSettings { TypeNameHandling = TypeNameHandling.All }); businesses.Dump(); } // Define other methods and classes here public abstract class Business { public string Name { get;set; } } public class Hotel : Business { public int Stars { get;set; } } public class Pool : Business { public int Capacity { get;set;} } </code></pre> <p>It worked perfectly. Abstract collection serialized to:</p> <pre><code>{ "$type": "System.Collections.Generic.List`1[[UserQuery+Business, query_jvrdcu]], mscorlib", "$values": [ { "$type": "UserQuery+Hotel, query_jvrdcu", "Stars": 5, "Name": "Hilton" }, { "$type": "UserQuery+Pool, query_jvrdcu", "Capacity": 500, "Name": "Big Splash" } ] } </code></pre> <p>The original and the deserialized collections matched.</p>
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    1. USTimothy Walters
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    1. COActually it is like that, but, there is also a list is in the abstract class, because it's a tree node structure.
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    2. COi've also tried to specify the option in the deserialization
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    3. CO@L.Trabacchin I have posted working sample code (if you use LINQPad in "C# Program" mode and reference Newtonsoft.Json).
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