使用HttpModuleHttp模块实现cookie跨二级域名

1、CookieModule的实现

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Security;

namespace HttpModule
{
    public class CookieModule : IHttpModule
    {
        public CookieModule()
        {
            //
            // TODO: Add constructor logic here
            //
        }

        public void Dispose()
        {
            
        }

        public void Init(HttpApplication context)
        {
            context.EndRequest += new EventHandler(context_EndRequest);
        }

        void context_EndRequest(object sender, EventArgs e)
        {
            HttpContext context = (sender as HttpApplication).Context;
            string cookieName = FormsAuthentication.FormsCookieName;
            HttpCookie cookie = context.Response.Cookies[cookieName];
            if (cookie != null)
            {
                cookie.Domain = ".xys.cn";
            }
        }
    }
}

 2、在web.config里配置http模块

<system.web>
    <httpModules>
      <add name="HttpCookie" type="HttpModule.CookieModule"/>
    </httpModules>
    <compilation debug="true" targetFramework="4.0" />

    <authentication mode="Forms">
      <forms loginUrl="~/Account/Login.aspx" timeout="2880" />
    </authentication>

    <membership>
      <providers>
        <clear/>
        <add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="ApplicationServices"
             enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false"
             maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10"
             applicationName="/" />
      </providers>
    </membership>

    <profile>
      <providers>
        <clear/>
        <add name="AspNetSqlProfileProvider" type="System.Web.Profile.SqlProfileProvider" connectionStringName="ApplicationServices" applicationName="/"/>
      </providers>
    </profile>

    <roleManager enabled="false">
      <providers>
        <clear/>
        <add name="AspNetSqlRoleProvider" type="System.Web.Security.SqlRoleProvider" connectionStringName="ApplicationServices" applicationName="/" />
        <add name="AspNetWindowsTokenRoleProvider" type="System.Web.Security.WindowsTokenRoleProvider" applicationName="/" />
      </providers>
    </roleManager>

  </system.web>

HTTP 模块介绍:http://msdn.microsoft.com/zh-cn/library/ms178468%28v=VS.80%29.aspx