ASP.Net MVC 3 JsonValueProviderFactory issue with controller method which accepts array arg

Question

I am allowing JsonValueProviderFactory to populate the parameters of my controller action. One of the parameters is an array of Cat. This works, but sometimes when there is only a single Cat it doesn't get passed in as an array, the argument is just Cat. I am using ExtJs, which is handling everything clientside.

Is there a way to handle this server-side? Or will I need to hack the request from ExtJs to force it to always send an array?

    [HttpPost]
    public ActionResult Edit(int id, IEnumerable<Cat> Data){...}

Darin Dimitrov · Accepted Answer · 2011-03-17 12:59:03Z

1

A proper JSON request should look like this if you have a single cat:

{ 'id': '123', 'Data': [ { 'Name': 'Felix', 'Age': 6 } ] }

and for multiple cats:

{ 'id': '123', 'Data': [ { 'Name': 'Felix', 'Age': 6 }, { 'Name': 'Morgan', 'Age': 2 } ] }

answered Mar 17, 2011 at 12:59

Darin Dimitrov

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David Fox · Accepted Answer · 2011-03-17 12:55:24Z

0

MVC is attempting to bind the single instance of Cat to just that, an instance of Cat and not IEnumerable. Pass the array.

If you want to handle it server side, you could always:

List<Cat> cats = new List<Cat>;
cats.Add(argCat);
...

Since your controller argument is IEnumerable, it would seem you're expecting a set of data anyway. Maybe consider a separate controller action for the single instance if it makes business sense.

answered Mar 17, 2011 at 12:55

David Fox

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