using System;using System.Collections.Generic;using System.IO;//using System.Linq;using System.Web;// <summary>// IP訪問頻率控制// </summary> public static class IPCacheManager{  /// <summary>  /// IP緩存集合   /// </summary>   private static List<IPCacheInfo> dataList = new List<IPCacheInfo>();  private static object lockObj = new object();  /// <summary>   /// 一段時間內，最大請求次數,必須大于等于1   /// </summary>   private static int maxTimes = 3;  /// <summary>   /// 一段時間長度（單位秒)，必須大于等于1   /// </summary>   private static int partSecond = 30;  /// <summary>   /// 請求被拒絕是否加入請求次數   /// </summary>   private static bool isFailAddIn = false;  static IPCacheManager()  {  }  /// <summary>   /// 設置時間，默認maxTimes=3, partSecond=30   /// </summary>   /// <param name="_maxTimes">最大請求次數</param>   /// <param name="_partSecond">請求單位時間</param>   public static void SetTime(int _maxTimes, int _partSecond)  {    maxTimes = _maxTimes;    partSecond = _partSecond;  }  /// <summary>   /// 檢測一段時間內，IP的請求次數是否可以繼續請求   /// 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 請求被拒絕也需要加入當次請求          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 請求被拒絕就不需要加入當次請求了          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; }  }}