特殊问题解决

强制xml输出格式转换成Json：

 protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas();
            GlobalConfiguration.Configure(WebApiConfig.Register);
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            BundleConfig.RegisterBundles(BundleTable.Bundles);

            GlobalConfiguration.Configuration.Formatters.XmlFormatter.SupportedMediaTypes.Clear();
        }

在Applicaiton_Start中的下方添加:

 GlobalConfiguration.Configuration.Formatters.XmlFormatter.SupportedMediaTypes.Clear();