webapi中使用session

webapi中使用session

修改global.cs里面的内容
using System;
using System.Web;
using System.Web.Routing;
using System.Web.Http;
using System.Web.Http.WebHost;
using System.Web.SessionState;

namespace ApiControllerExample
{
public class Global : System.Web.HttpApplication
{

public override void Init()
{
//取下注释下面这行语句，将使得全部Api都可以访问Session
//this.PostAuthenticateRequest += (s, e) => HttpContext.Current.SetSessionStateBehavior(SessionStateBehavior.Required);
base.Init();
}

protected void Application_Start(object sender, EventArgs e)
{
RouteConfig.RegisterRoutes(RouteTable.Routes);  // 注册路由
}
}

public class SessionableControllerHandler : HttpControllerHandler, IRequiresSessionState
{
public SessionableControllerHandler(RouteData routeData) : base(routeData) { }
}

public class SessionStateRouteHandler : IRouteHandler
{
IHttpHandler IRouteHandler.GetHttpHandler(RequestContext requestContext)
{
return new SessionableControllerHandler(requestContext.RouteData);
}
}

public class RouteConfig
{
public static void RegisterRoutes(RouteCollection routes)
{
routes.MapHttpRoute(
name: "WebApiRoute1",
routeTemplate: "api/{controller}/{id}",
defaults: new { id = RouteParameter.Optional }
).RouteHandler = new SessionStateRouteHandler();  // 使用Session

routes.MapHttpRoute(
name: "WebApiRoute2",
routeTemplate: "api/{controller}/{id}/{id2}",
defaults: new{id = RouteParameter.Optional }
);  // 不使用Session
}
}
}

webapi用例：
using System;
using System.Web.Http;

namespace ApiControllerExample
{
public class StateController : ApiController
{
public string Get(int id)
{
try
{
return  GetStateInfo(id);
}
catch (Exception err)
{
return "excep: " + err.Message;
}
}

private string GetStateInfo(int id)
{
System.Web.HttpContext context = System.Web.HttpContext.Current;

if (id == 1)
{
return context.Session["state"].ToString();
}
else if (id == 2)
{
return context.Cache["state"].ToString();
}
else
{
return context.Application["state"].ToString();
}
}

//这个方法无法使用Session
public string Get(int id, int id2)
{
System.Web.HttpContext context = System.Web.HttpContext.Current;

try
{
return context.Session["state"].ToString();
}
catch (Exception err)
{
return "excep: " + err.Message;
}
}
}
}