【ASP.Net】WEB API配置返回Json格式的httpResponse的content

在WebApiConfig文件中，代码如下：

public static void Register(HttpConfiguration config)
        {
            var json = config.Formatters.JsonFormatter;
            json.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore;
            config.Formatters.Remove(config.Formatters.XmlFormatter);
            var jsonFormatter = config.Formatters.OfType<JsonMediaTypeFormatter>().First();
            jsonFormatter.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
            config.MapHttpAttributeRoutes();
            config.Routes.MapHttpRoute(
                name: "DefaultApi",
                routeTemplate: "api/{controller}/{action}/{id}",
                defaults: new { id = RouteParameter.Optional }
            );
        }