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copied!<p>Just thought i would share a solution also based on this that works with the Knowntype attribute using reflection , had to get derived class from any base class, solution can benefit from recursion to find the best matching class though i didn't need it in my case, matching is done by the type given to the converter if it has KnownTypes it will scan them all until it matches a type that has all the properties inside the json string, first one to match will be chosen. </p> <p>usage is as simple as:</p> <pre><code> string json = "{ Name:\"Something\", LastName:\"Otherthing\" }"; var ret = JsonConvert.DeserializeObject<A>(json, new KnownTypeConverter()); </code></pre> <p>in the above case ret will be of type B.</p> <p>JSON classes:</p> <pre><code>[KnownType(typeof(B))] public class A { public string Name { get; set; } } public class B : A { public string LastName { get; set; } } </code></pre> <p>Converter code:</p> <pre><code>/// <summary> /// Use KnownType Attribute to match a divierd class based on the class given to the serilaizer /// Selected class will be the first class to match all properties in the json object. /// </summary> public class KnownTypeConverter : JsonConverter { public override bool CanConvert(Type objectType) { return System.Attribute.GetCustomAttributes(objectType).Any(v => v is KnownTypeAttribute); } public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer) { // Load JObject from stream JObject jObject = JObject.Load(reader); // Create target object based on JObject System.Attribute[] attrs = System.Attribute.GetCustomAttributes(objectType); // Reflection. // Displaying output. foreach (System.Attribute attr in attrs) { if (attr is KnownTypeAttribute) { KnownTypeAttribute k = (KnownTypeAttribute) attr; var props = k.Type.GetProperties(); bool found = true; foreach (var f in jObject) { if (!props.Any(z => z.Name == f.Key)) { found = false; break; } } if (found) { var target = Activator.CreateInstance(k.Type); serializer.Populate(jObject.CreateReader(),target); return target; } } } throw new ObjectNotFoundException(); // Populate the object properties } public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer) { throw new NotImplementedException(); } } </code></pre>

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