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);

        }
    }
}