Angular & ASP.NET MVC - Parameter is null when I pass a parameter to my backend Controller

Question

If you look at the parameter of my ASP.NET MVC Controller clientId, it's always null.

the only way i can get it to not be null and actually pass the data through successfully is to create a class... but that gets tedious and I can't create a class for every backend function i make just to get this to work.

Is there a way to pass data successfully without creating a class?

Thank you for any help

Angular Factory

PlaylistsFactory.getUsersForClient = function (clientId) {
return $http({
    method: 'POST',
    url: '/Show/GetUsersForClient',
    data: JSON.stringify(clientId)
  });
};

Angular Controller

PlaylistsFactory.getUsersForClient(clientId)
  .success(function (userList) {
    console.log('success!');
  });

ASP.NET MVC Controller

public JsonResult GetUsersForClient(string clientId)  //clientId is always null unless i create an object
{
  ...
}

I believe your JSON object name needs to be the same name as your C# parameter. In this case - clientId — Dudemanword
– Dudemanword, Commented Aug 27, 2015 at 23:07
@Dudemanword isn't that what I'm doing when I call PlaylistsFactory.getUsersForClient(clientId) though? — user1189352
– user1189352, Commented Aug 27, 2015 at 23:08

Dudemanword · Accepted Answer · 2015-08-27 23:29:34Z

2

Try making your JSON parameter match the name of your C# parameter as well as encasing that in the data payload as JSON:

return $http({
    method: 'POST',
    url: '/Show/GetUsersForClient',
    data: {clientId: JSON.stringify(clientId)}
  });
};

edited Aug 27, 2015 at 23:29

answered Aug 27, 2015 at 23:08

Dudemanword

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2 Comments

user1189352 Over a year ago

ah.. i thought 'data' was what it's suposed to be in default... okay let me try this

Dudemanword Over a year ago

@user1189352 You are correct. It is supposed to be in data. But you are supposed to wrap your data in another object

sebastian · Accepted Answer · 2015-08-27 23:24:16Z

i would recommend that you follow the rules of a RESTful API.

This means you should use the HTTP verbs like GET (getting data), POST (updating data), PUT (creating data), DELETE (deleting data). See http://www.tutorialsteacher.com/mvc/actionverbs-in-mvc

Then you could also add the parameter you want to pass into the route of your API: /Show/GetUsersForClient/{clientId}. See http://blogs.msdn.com/b/webdev/archive/2013/10/17/attribute-routing-in-asp-net-mvc-5.aspx

In this case you disengage the problem of sending data in the body without having a ViewModel on the MVC-Controller side.

When you want to proceed with your solution, then try creating the Object before sending it:

PlaylistsFactory.getUsersForClient = function (clientId) {
var payload = { clientId: clientId }   
return $http({
          method: 'POST',
          url: '/Show/GetUsersForClient',
          data: payload
       });
};

MVC / WebAPI also sometime choke when the content-type in the request header is text/plain or application/json. For example: a json-object will not be recognized properly by .Net when sent in text/plain.

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