String[] serverlist = { "192.168.1.100:11211",
"192.168.1.101:11211" };
// initialize the pool for memcache servers
SockIOPool pool = SockIOPool.GetInstance("test");
pool.SetServers(serverlist);
pool.Initialize();
mc = new MemcacheClient();
mc.PoolName = "test";
mc.EnableCompression = false;
pool.Shutdown();//关闭连接池

using Memcached.ClientLibrary;
using System;

namespace PMS.Common
{
 public class MemcacheHelper
 {
 private static readonly MemcachedClient Mc = null;

 static MemcacheHelper()
 {
 //最好放在配置文件中
 string[] serverlist = { "127.0.0.1:11211", "10.0.0.132:11211" };

 //初始化池
 var pool = SockIOPool.GetInstance();
 pool.SetServers(serverlist);

 pool.InitConnections = 3;
 pool.MinConnections = 3;
 pool.MaxConnections = 5;

 pool.SocketConnectTimeout = 1000;
 pool.SocketTimeout = 3000;

 pool.MaintenanceSleep = 30;
 pool.Failover = true;

 pool.Nagle = false;
 pool.Initialize();

 // 获得客户端实例
 Mc = new MemcachedClient {EnableCompression = false};
 }
 /// <summary>
 /// 存储数据
 /// </summary>
 /// <param name="key"></param>
 /// <param name="value"></param>
 /// <returns></returns>
 public static bool Set(string key,object value)
 {
 return Mc.Set(key, value);
 }
 public static bool Set(string key, object value,DateTime time)
 {
 return Mc.Set(key, value,time);
 }
 /// <summary>
 /// 获取数据
 /// </summary>
 /// <param name="key"></param>
 /// <returns></returns>
 public static object Get(string key)
 {
 return Mc.Get(key);
 }
 /// <summary>
 /// 删除
 /// </summary>
 /// <param name="key"></param>
 /// <returns></returns>
 public static bool Delete(string key)
 {
 return Mc.KeyExists(key) && Mc.Delete(key);
 }
 }
}

public ActionResult UserLogin()
{
 #region 验证码校验
 var validateCode = Session["validateCode"] != null ? Session["validateCode"].ToString() : string.Empty;
 if (string.IsNullOrEmpty(validateCode))
 return Content("no:验证码错误!!");
 Session["validateCode"] = null;
 var txtCode = Request["ValidateCode"];
 if (!validateCode.Equals(txtCode, StringComparison.InvariantCultureIgnoreCase))
 return Content("no:验证码错误!!");
 #endregion

 var userName = Request["UserName"];
 var userPwd = Request["PassWord"];
 //查询用户是否存在
 var user = UserService.LoadEntities(u => u.UserName == userName && u.PassWord == userPwd).FirstOrDefault();
 if (user == null) return Content("no:登录失败");

 //产生一个GUID值作为Memache的键.
 var sessionId = Guid.NewGuid().ToString();
 //将登录用户信息存储到Memcache中。
 MemcacheHelper.Set(sessionId, SerializeHelper.SerializeToString(user), DateTime.Now.AddMinutes(20));
 //将Memcache的key以Cookie的形式返回给浏览器。
 Response.Cookies["sessionId"].Value = sessionId;
 return Content("ok:登录成功");
}

protected override void OnActionExecuting(ActionExecutingContext filterContext)
{
 base.OnActionExecuting(filterContext);
 //if (Session["user"] == null)
 if (Request.Cookies["sessionId"] != null)
 {
 var sessionId = Request.Cookies["sessionId"].Value;
 //根据该值查Memcache.
 var obj = MemcacheHelper.Get(sessionId);
 if (obj == null)
 {
 filterContext.Result = Redirect("/Login/Index");
 return;
 }
 var user = SerializeHelper.DeserializeToObject<User>(obj.ToString());
 LoginUser = user;
 //模拟出滑动过期时间.
 MemcacheHelper.Set(sessionId, obj, DateTime.Now.AddMinutes(20)); 
 }
 else
 filterContext.Result = Redirect("/Login/Index");
}