using System;using System.Collections.Generic;using System.IO;//using System.Linq;using System.Web;// <summary>// IP访问频率控制// </summary>  public static class IPCacheManager{    /// <summary>    /// IP缓存集合      /// </summary>      private static List<IPCacheInfo> dataList = new List<IPCacheInfo>();    private static object lockObj = new object();    /// <summary>     /// 一段时间内，最大请求次数,必须大于等于1     /// </summary>     private static int maxTimes = 3;    /// <summary>     /// 一段时间长度（单位秒)，必须大于等于1     /// </summary>     private static int partSecond = 30;    /// <summary>     /// 请求被拒绝是否加入请求次数     /// </summary>     private static bool isFailAddIn = false;    static IPCacheManager()    {    }    /// <summary>     /// 设置时间，默认maxTimes=3, partSecond=30     /// </summary>     /// <param name="_maxTimes">最大请求次数</param>     /// <param name="_partSecond">请求单位时间</param>     public static void SetTime(int _maxTimes, int _partSecond)    {        maxTimes = _maxTimes;        partSecond = _partSecond;    }    /// <summary>     /// 检测一段时间内，IP的请求次数是否可以继续请求     /// 和使用     /// </summary>     /// <param name="ip"></param>     /// <returns></returns>     public static bool CheckIsAble(string ip)    {        lock (lockObj)        {            var item = dataList.Find(p => p.IP == ip);            if (item == null)            {                item = new IPCacheInfo();                item.IP = ip;                item.ReqTime.Add(DateTime.Now);                dataList.Add(item);                return true;            }            else            {                if (item.ReqTime.Count > maxTimes)                {                    item.ReqTime.RemoveAt(0);                }                var nowTime = DateTime.Now;                if (isFailAddIn)                {                    #region 请求被拒绝也需要加入当次请求                    item.ReqTime.Add(nowTime);                    if (item.ReqTime.Count >= maxTimes)                    {                        if (item.ReqTime[0].AddSeconds(partSecond) > nowTime)                        {                            return false;                        }                        else                        {                            return true;                        }                    }                    else                    {                        return true;                    }                    #endregion                }                else                {                    #region 请求被拒绝就不需要加入当次请求了                    if (item.ReqTime.Count >= maxTimes)                    {                        if (item.ReqTime[0].AddSeconds(partSecond) > nowTime)                        {                            return false;                        }                        else                        {                            item.ReqTime.Add(nowTime);                            return true;                        }                    }                    else                    {                        item.ReqTime.Add(nowTime);                        return true;                    }                    #endregion                }            }        }    }}public class IPCacheInfo{    public string IP { get; set; }    private List<DateTime> reqTime = new List<DateTime>();    public List<DateTime> ReqTime    {        get { return this.reqTime; }        set { this.reqTime = value; }    }}