由于项目实际需要，我希望让WebApi服务也能支持Session，所以便查找资料按照网上的方法开始着手实验。

然后就有了以下的代码，主要是说让WebApi支持Session,要重写Global.asax的Init方法

public class WebApiApplication : System.Web.HttpApplication { protected void Application_Start() { GlobalConfiguration.Configuration.EnableCors(); GlobalConfiguration.Configuration.Formatters.Insert(0, new JsonpMediaTypeFormatter()); AreaRegistration.RegisterAllAreas(); GlobalConfiguration.Configuration.Formatters.Remove(GlobalConfiguration.Configuration.Formatters.XmlFormatter); WebApiConfig.Register(GlobalConfiguration.Configuration); FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters); RouteConfig.RegisterRoutes(RouteTable.Routes); BundleConfig.RegisterBundles(BundleTable.Bundles); } public override void Init()//重写这个方法 { PostAuthenticateRequest += MvcApplication_PostAuthenticateRequest; base.Init(); } private void MvcApplication_PostAuthenticateRequest(object sender, EventArgs e) { HttpContext.Current.SetSessionStateBehavior(SessionStateBehavior.Required); } }

　　重写方法后，准备动手编写测试的Controller代码 如下，很简单的几句代码,A方法模拟第一次请求将携带的参数存入Session，其中键和值都为传入的参数appid，B方法是返回键为appid的session的值。

public class GetDataController : ApiController { [HttpGet] public void A(string appid) { System.Web.HttpContext.Current.Session[appid] = appid; System.Web.HttpContext.Current.Session.Timeout =1; } [HttpGet] public ResponseData B(string appid) { return new ResponseData() { data = System.Web.HttpContext.Current.Session[appid].ToString(), isSuccess = true }; } }

　　用谷歌浏览器，模拟A\B两个请求，实验成功！！！！！很是高兴！！ 

但问题来了，通过浏览器运行可以取到session的值，但是在手机的移动设备端，访问居然每次获取session的值都是null，有些不解，便开始寻找问题的根源所在，为什么浏览器正常，然而在移动设备模拟就不行了呢？？？？？？     功夫不负有心人，，终于找到了问题所在，大概原因就是说，session是靠一个的cookie来区分的，客户端每次访问要携带这个cookie才能保持session的状态。于是我便用控制台模拟移动端进行测试。代码如下：

class Program { static void Main(string[] args) { GetMethod(":8828/api/GetDAta/A?appid=abc"); // PostMethod(":8828/api/GetDAta/Login/"); Console.ReadKey(); GetMethodTest(":8828/api/GetDAta/b?appid=abc"); Console.ReadKey(); } private static CookieContainer m_Cookie = new CookieContainer(); private static void GetMethod(String url) { HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest; request.CookieContainer = m_Cookie; string cookieheader = request.CookieContainer.GetCookieHeader(new Uri(url)); m_Cookie.SetCookies(new Uri(url), cookieheader); using (HttpWebResponse response = request.GetResponse() as HttpWebResponse) { StreamReader reader = new StreamReader(response.GetResponseStream()); Console.WriteLine(reader.ReadToEnd()); } } private static void GetMethodTest(String url) { HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest; request.CookieContainer = m_Cookie; m_Cookie = request.CookieContainer; using (HttpWebResponse response = request.GetResponse() as HttpWebResponse) { StreamReader reader = new StreamReader(response.GetResponseStream()); Console.WriteLine(reader.ReadToEnd()); } } }

request.CookieContainer = m_Cookie; string cookieheader = request.CookieContainer.GetCookieHeader(new Uri(url)); m_Cookie.SetCookies(new Uri(url), cookieheader);

request.CookieContainer = m_Cookie; m_Cookie = request.CookieContainer;

到此，一切测试完毕，正常运行。

初学webapi，哪有不对，希望园友多多指教！！！！！！！

WebApi 能支持Session