在ASP.NET MVC控制器中接收嵌套的匿名对象

Question

I need a ASP.NET MVC controller, which receives anonymous object from JS in JSON to iterate thru its properties. I used to do this, receiving Dictionary<string, object> . But now one of values is Array , and insted of

receivedDictionary[Photos] = [object, object, object]

it gets it as

receivedDictionary[Photos[0]] = object, receivedDictionary[Photos[1]] = object, receivedDictionary[Photos[2]] = object

I get not one dictionary entry with key = Photos and value = array, but many entries with key = Photos[x] and value = object.

How do I get it as one entry in dictionary or is there any better way to get it as dynamic anonymous object and iterate thru its properties just like in JS?

UPD: JSON looks like this:

{"fields":{"TotalFloors":"9","HouseNumber":"10","Photos":[{"id":0,"ParentID":0,"OriginalUrl":"py4s1y3uyqu","OriginalExt":".jpg","ThumbUrl":"2hn04w2lzuu","FormatUrls":{"WH_109_82_Url":"4cwjarqudvo","WH_766_454_Url":"oofm5qo21rr"}},{"id":0,"ParentID":0,"OriginalUrl":"t3csgq20iro","OriginalExt":".jpg","ThumbUrl":"j1uwwburmse","FormatUrls":{"WH_109_82_Url":"gm4qoery1u2","WH_766_454_Url":"a3c20re3g1d"}}],"Details":"Other details"}}

Controller definition:

        [HttpPut]
        public ActionResult restId(string className, int id, Dictionary<string, object> fields)
        {
            ....
        }

Answer 1

The JsonValueProvider used by the DefaultModelBinder seems to be treating array in an odd fashion in this case (based on the source here ), so even a dynamic will most likely have the issue. (Don't think you'll have this issue in MVC 6 however)

However, calling the JavascriptSerializer directly (which funny enough is what the default provider uses) produces the results you're after:

var js = new JavaScriptSerializer();
var res = js.DeserializeObject(@"{'TotalFloors':'9','HouseNumber':'10','Photos':[...],'Details':'Other details'}");

To address your issue you could either alter the parameter to a string and run the above code in your action (obviously replacing the JSON string with the parameter), just means the JSON you're submitting from the front end would need to look more like:

// wrapping the JSON object in quotes to stringify it
{ 'fields' : "{ 'TotalFloors': '9', 'HouseNumber': .... }" } 

Otherwise you could implement a custom JsonValueProvider like the one proposed here: https://json.codeplex.com/discussions/347099

The custom value provider is probably the cleaner solution.