asp.net中限制用户单位时间请求数

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

namespace  WebApplication1
{
     public   class  RequestCounter
    {
         private   static  Dictionary < string , RequestCounter >  Counters  =   new  Dictionary < string , RequestCounter > ();
         public   const   int  MaxRequestCount  =   3 ;
         public   const   int  ResetSeconds  =   2 ;
         public   int  CurrentCount {  get ;
             private   set ; }
         public   string  UserID {  get ;  set ; }
         private  DateTime LastResetTime;
         public   bool  AddCount( )
        {
            DateTime now  =  DateTime.Now;
             if  ((now  -  LastResetTime).Seconds  > = ResetSeconds)
            {
                 this .CurrentCount  =   0 ;
                 this .LastResetTime  =  now;
            }
　　　　　　　 this .CurrentCount ++ ;
             if  ( this .CurrentCount  < = MaxRequestCount)
                 return   true ;
             else
                 return   false ;
        }
         public   static  RequestCounter GetCounter( string  userID)
        {
             if  (Counters.ContainsKey(userID))
                 return  Counters[userID];
             else
            {
                Counters[userID]  =   new  RequestCounter();
                 return  Counters[userID];
            }
        }
    }
}

using  System;
using  System.Collections.Generic;
using  System.Linq;
using  System.Web;
using  System.Web.UI;
using  System.Web.UI.WebControls;

namespace  WebApplication1
{
     public   partial   class  _Default : System.Web.UI.Page
    {
         protected   void  Page_Load( object  sender, EventArgs e)
        {
            RequestCounter counter  =  RequestCounter.GetCounter( " xhan " );
             bool  canAccess  =  counter.AddCount( );

            Response.Write(canAccess);
            Response.Write(counter.CurrentCount);

        }
    }
}