ASP.NET MVC: Posting JSON to Controller
- by JamesBrownIsDead
I've got this in my controller:
[HttpPost]
public void UpdateLanguagePreference(string languageTag)
{
if (string.IsNullOrEmpty(languageTag))
{
throw new ArgumentNullException("languageTag");
}
...
}
And have this jQuery code POSTing to the controller:
jQuery.ajax({
type: 'POST',
url: '/Config/UpdateLanguagePreference',
contentType: 'application/json; charset=utf-8',
data: '{ "languageTag": "' + selectedLanguage + '" }'
});
When I try to the code, however, I get the error:
Server Error in '/' Application.
Value cannot be null.
Parameter name: languageTag
What's the problem? Isn't this how to POST JSON to an MVC Controller? I can examine the POST using Fiddler and see that the request is correct. For some reason, UpdateLanguagePreference() is getting a null or empty string.
