Getting the values of action parameters within an action filter

Question

I have an action that I am POSTing to from jquery:

[HttpPost]
public void UpdateGroupName(int groupId, string name)
{
         


        

Answer 1

Try without the stringify. I guess MVC is understanding another way of binding besides the request parameter -> action parameter. I guess it's understanding the json posted. JQuery, if you pass just the data object (without stringify) will post each field as a request parameter (at least, I think so). It's easy to try :)

Answer 2

The reason your code doesn't work is because you are sending your request as a JSON string. So there are no request parameters in the POST body and you cannot fetch them in the Request.Params.

So instead of:

filterContext.HttpContext.Request.Params["groupId"]

use:

filterContext.Controller.ValueProvider.GetValue("groupId").AttemptedValue

This will query the value provider (in your case the JsonValueProvider) to obtain the corresponding value send by the client.