c# - Adding headers in ASP.NET MVC 3

Question

I have a basic ASP.NET MVC 3 app. I have a basic action that looks like the following:

[AcceptVerbs(HttpVerbs.Post)]
public ActionResult AddItem(string id, string name, string description, string username)
{
  // Do stuff
  return Json(new { statusCode = 1 });
}

I am trying to let someone access this action via a JQuery Mobile app that will be hosted in Phone Gap. I was told that I need to return Access-Control-Allow-Origin: * in my header. However, I'm not sure how to return that in the header. Can someone please show me how to do that?

Thank you so much.

Answer 1

    public class HttpHeaderAttribute : ActionFilterAttribute
    {
        /// 
        /// Gets or sets the name of the HTTP Header.
        /// 
        /// The name.
        public string Name { get; set; }

        /// 
        /// Gets or sets the value of the HTTP Header.
        /// 
        /// The value.
        public string Value { get; set; }

        /// 
        /// Initializes a new instance of the  class.
        /// 
        /// The name.
        /// The value.
        public HttpHeaderAttribute(string name, string value)
        {
            Name = name;
            Value = value;
        }

        public override void OnResultExecuted(ResultExecutedContext filterContext)
        {
            filterContext.HttpContext.Response.AppendHeader(Name, Value);
            base.OnResultExecuted(filterContext);
        }
   }    

---

[HttpHeader("Access-Control-Allow-Origin","*")]
    public ActionResult myaction(int id)
    {
        // ...
    }