MVC4 RC WebApi parameter binding

Question

I upgraded from MVC4 beta to RC and the latest autofac. The following action was binding properly, but now both parameters are null. I see they changed things about the Formatters and such but I am not sure what caused my problem

[HttpPost]    
RedirectModel MyAction(string value1, string value1)

REQUEST

Method: POST
Accept: application/json
URL: api/controller/myaction
BODY: {"value1":"1000", "value2":"foo"}

mhu · Accepted Answer · 2012-06-12 13:23:00Z

20

When you want to avoid using a DTO object, try this:

[HttpPost]    
RedirectModel MyAction(dynamic value1, dynamic value2) {
    string sValue1 = value1;
    string sValue2 = value2;

answered Jun 12, 2012 at 13:23

mhu

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1 Comment

samuelesque Over a year ago

You are a hero. This is the only viable solution in my very specific case. I can't believe I didn't think of it before. I wish I could give you additional upvotes. Cheers.

Jim Harte · Accepted Answer · 2012-06-11 17:01:06Z

12

Not really sure why the change from Beta, but I was able to make it work by changing the action signature to:

[HttpPost]    
RedirectModel MyAction(MyActionDTO dto)

and defining MyActionDTO as

 public class MyActionDTO 
 {
        public string value1 { get; set; }
        public string value2 { get; set; }
 }

It was throwing an exception about not being able to bind to multiple body parameters using the two string paramaters. I guess using the DTO object more closely represents what you're sending in the AJAX call (a JSON object).

edited Jun 11, 2012 at 17:01

answered Jun 8, 2012 at 21:05

Jim Harte

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6 Comments

Thad Over a year ago

Adding [FromBody] to the parameters did not having any effect, the parameters were still null.

Thad Over a year ago

That does work, but I was hoping not to have to change it. We do have a few calls that have a single string in the body. I not sure why a single primitive types is required to be on the query string.

Jim Harte Over a year ago

According to this:blogs.msdn.com/b/jmstall/archive/2012/04/16/…, you can pass one and only one item in the body. So, if you want to pass a string value, you can do that, just pass the value without wrapping it as a JSON string.

Jim Harte Over a year ago

asp.net site updated today with more info: asp.net/web-api/overview/working-with-http/… Note you must prefix the value with an equal sign (=) when posting a simple value in the body

Omar Isaid Over a year ago

Thank you very much , binding parameters to C# class works fine for me .I want to ask why I can send parameters only to HttpPost WebApi actions , can I send parameters to HttpGet Web Api action ?

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