How to deserialize a JObject to .NET object

Question

I happily use the Newtonsoft JSON library. For example, I would create a JObject from a .NET object, in this case an instance of Exception (might or might not be a subclass)

if (result is Exception)     var jobjectInstance = JObject.FromObject(result); 

now I know the library can deserialize JSON text (i.e. a string) to an object

// only works for text (string) Exception exception = JsonConvert.DeserializeObject<Exception>(jsontext);  

but what I am looking for is:

// now i do already have an JObject instance Exception exception = jobjectInstance.???? 

Well it is clear that I can go from on JObject back to JSON text and then use the deserialize functionality, but that seems backwards to me.

Answer 1

According to this post, it's much better now:

// pick out one album JObject jalbum = albums[0] as JObject;  // Copy to a static Album instance Album album = jalbum.ToObject<Album>(); 

Documentation: Convert JSON to a Type

Answer 2

From the documentation, I found this:

JObject o = new JObject(    new JProperty("Name", "John Smith"),    new JProperty("BirthDate", new DateTime(1983, 3, 20)) );  JsonSerializer serializer = new JsonSerializer(); Person p = (Person)serializer.Deserialize(new JTokenReader(o), typeof(Person));  Console.WriteLine(p.Name); 

The class definition for Person should be compatible to the following:

class Person {     public string Name { get; internal set; }     public DateTime BirthDate { get; internal set; } } 

If you are using a recent version of JSON.net and don't need custom serialization, please see Tien Do's answer, which is more concise.