.net Jsonp（global.asax），WebApiContrib.Formatting.Jsonp

我试图实例化JSONPMediatyFormatter，但不确定“new”构造中的第一个参数需要什么。我在网上找不到这样的例子。非常感谢

using System.Web;
using System.Web.Http;
using System.Web.Mvc;
using System.Net.Http;
using System.Net.Http.Formatting;
using WebApiContrib.Formatting.Jsonp;
namespace IAUWApi
{
    public class WebApiApplication : HttpApplication
    {
        protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas();

            // Add these two lines to initialize Routes and Filters:
            IAUWApi.App_start.WebAPIConfig.Register(GlobalConfiguration.Configuration);
            IAUWApi.App_start.FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);

            var config = GlobalConfiguration.Configuration;
            config.Formatters.Insert(0, new JsonpMediaTypeFormatter("","callback"));
       }
   }

}

---

可能用户很久以前就解决了这个问题，但作为参考，它在这里，应该这样做：

var config = GlobalConfiguration.Configuration;
config.Formatters.Insert(0, new JsonpMediaTypeFormatter(new JsonMediaTypeFormatter()));