using System;using System.Collections.Generic;using System.Linq;using System.Net.Http.Formatting;using System.Web;using System.Web.Http;using System.Web.Security;using System.Web.SessionState;namespace AS.GroupOn.Web{    public class Global : System.Web.HttpApplication    {        protected void Application_Start(object sender, EventArgs e)        {            WebApiConfig.Register(GlobalConfiguration.Configuration);         }        public override void Init()        {            this.PostAuthenticateRequest += MvcApplication_PostAuthenticateRequest;//用于打开session            base.Init();        }      void MvcApplication_PostAuthenticateRequest(object sender, EventArgs e)        {            System.Web.HttpContext.Current.SetSessionStateBehavior(                SessionStateBehavior.Required);        }    }    public static class WebApiConfig    {        public static void Register(HttpConfiguration config)        {            config.Routes.MapHttpRoute(                  name: "ActionApi",                  routeTemplate: "api/{controller}/{action}/{id}",                  defaults: new { id = RouteParameter.Optional }              );            config.Routes.MapHttpRoute(                name: "DefaultApi",                routeTemplate: "api/{controller}/{id}",                defaults: new { id = RouteParameter.Optional }            );            GlobalConfiguration.Configuration.Formatters.XmlFormatter.UseXmlSerializer = true;//设定返回方式            // config.Formatters.JsonFormatter.AddQueryStringMapping("$format", "json", "application/json");            //config.Formatters.XmlFormatter.AddQueryStringMapping("$format", "xml", "application/xml");             //config.Formatters.Remove(config.Formatters.JsonFormatter);            //config.Formatters.Remove(config.Formatters.XmlFormatter);            // 取消注释下面的代码行可对具有 IQueryable 或 IQueryable<T> 返回类型的操作启用查询支持。            // 若要避免处理意外查询或恶意查询，请使用 QueryableAttribute 上的验证设置来验证传入查询。            // 有关详细信息，请访问 http://go.microsoft.com/fwlink/?LinkId=279712。            //config.EnableQuerySupport();            // 若要在应用程序中禁用跟踪，请注释掉或删除以下代码行            // 有关详细信息，请参阅: http://www.asp.net/web-api            //  config.EnableSystemDiagnosticsTracing();        }    }}

using System.Net;
using System.Net.Http;
using System.Web;
using System.Web.Http;

 private HttpResponseMessage getReturnMessage(int sta, string msg, HttpStatusCode httpStatus = HttpStatusCode.MethodNotAllowed)        {            return Request.CreateResponse(httpStatus, new{status=sta,info=msg});        }        private HttpResponseMessage getReturnMessage(int sta,object obj, HttpStatusCode httpStatus = HttpStatusCode.OK)        {            return Request.CreateResponse(httpStatus, new { status = sta, obj});        }