C# dynamic object and JSON serialization with Json.Net


Heads up!

The blog has moved!
If you are interested in reading new posts, the new URL to bookmark is http://blog.valeriogheri.com/


I’m working on a project where I don’t need a solid domain model as all the logic is handled by the client-side code using ¬†javascript and various frameworks as SignalR, Knockout.js and jQuery.
That’s why I found myself unwilling to add dumb C# POCO objects just to handle JSON serialization and deserialization in the SignalR hub(s), and I turned to dynamic objects and Json.Net (starting from version 4.0) ¬†to handle this tasks easily and quickly.


Let’s say that for example I want to send data to the browser. All I have to do is to create an ExpandoObject (my new favourite .Net class!) and serialize it using Json.Net “JsonConvert.SerializeObject()”.

Let’s see an example:

dynamic foo = new ExpandoObject();
foo.Bar = "something";
string json = Newtonsoft.Json.JsonConvert.SerializeObject(foo);

And here is the output:


Json.Net offers a great way to deserialize a JSON string into a dynamic using the JObject (you can find it under the Newtonsoft.Json.Linq namespace and here the details).

Let’s see an example re-using the previous foo object:

dynamic foo = JObject.Parse(jsonText);
string bar = foo.Bar; // bar = "something"

And that’s it, really easy and yet really powerful.
In a more structured application, I would probably not use this trick as I would probably have all of my ViewModels and Domain Models objects ready to use in type safe serialization/deserialization operations, but that’s not always the case.

I hope this helps.