WebApi bind body to Json dictionary

Question

I'm trying to create a WebApi action method with the following signature:

[System.Web.Http.HttpPost] public object Execute([FromUri] string command, [FromUri] string method, [FromBody] IDictionary<string, JToken> arguments)

However, when I hit this method with requests, arguments never binds correctly (the two URI fields do). The ModelState shows a Json.NET parse error at the first character. I've tried request bodies that look like: id=50 and arguments={ "id": 50 }. How do I have to formulate my request to allow WebApi to correctly bind my parameters?

Dictionaries consist of keyValuePairs, thus in the json world an array of objects, each having a Key and Value property, so IDictionary<string,int> binding requries json something like arguments=[{Key:"id",Value:50},{Key:"another",Value:100}]. Might be off slightly, if you serialized a Dictionary as a JSON object you'd see what I mean. — AaronLS
– AaronLS, Commented Mar 18, 2013 at 21:03

Youssef Moussaoui · Accepted Answer · 2013-03-18 21:28:25Z

You don't need the "id=" or "arguments=" in the request body. You should be able to just send something that looks like this:

{"key1": 4, "key2": 50, "key3": {"member1": "value"}}

and have it work. The Dictionary would then contain key1: a JValue with value 4, key2: a JValue with value 50, key3: a JObject with a member1 member with value "value".

Do AJAX libraries like JQuery and YUI support posting data in this format?

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