实现数据缓存（类似Cache功能）

最新推荐文章于 2025-03-02 12:20:56 发布

原创最新推荐文章于 2025-03-02 12:20:56 发布 · 759 阅读

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#cache #callback #string #object #null #thread

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此博客展示了使用C#实现的MyCache类，用于缓存数据。该类利用Hashtable存储数据，通过线程自动清除超时未访问的数据，同时提供了获取、设置和移除数据的方法，还支持回调函数，可对缓存数据进行有效管理。

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using System;
using System.Threading;
using System.Collections;

namespace MyCache
{
/// <summary>
/// 实现缓存
/// </summary>
public sealed class MyCache
{
  private static Hashtable Hash = Hashtable.Synchronized(new Hashtable());
  private static Thread thread;
  static MyCache()
  {
   thread = new Thread(new ThreadStart(AutoRemoveData));
   thread.Start();
  }
  ~MyCache()
  {
   Hash.Clear();
   Hash = null;
   thread.Abort();
   thread = null;
  }

  private static void AutoRemoveData()
  {
   while (true)
   {
    foreach(object Obj in new ArrayList(Hash.Keys))
    {
     //清除超时没有访问量的讨论版所占内存

     if (((Data)Hash[Obj]).time< System.DateTime.Now)
     {
      try
      {
       Remove(Obj.ToString());
      }
      catch{}
     }
    }
    Thread.Sleep(1000);
   }
  }

  public static object Get(string Key)
  {
   if (Hash[Key] == null)
    return null;
   else
    return ((Data)Hash[Key]).Base;
  }

  //超过几分钟不访问：在每次访问的时候，更改到期时间（未加代码）
  public static void Set(object BaseData, string Key, int CacheTime)
  {
   Set(BaseData, Key, DateTime.Now.AddMinutes(CacheTime), null);
  }

  public static void Set(object BaseData, string Key, int CacheTime, string CallBack)
  {
   Set(BaseData, Key, DateTime.Now.AddMinutes(CacheTime), CallBack);
  }

  public static void Set(object BaseData, string Key, DateTime RemoveTime)
  {
   Set(BaseData, Key, RemoveTime, null);
  }

  public static void Set(object BaseData, string Key, DateTime RemoveTime, string CallBack)
  {
   if (Hash[Key] != null)
    Remove(Key);
   Data d = new Data(BaseData,RemoveTime,CallBack);
   Hash.Add(Key,d);
  }

  private static void Remove(string Key)
  {
   if (Hash[Key] == null)
    return;
   Data d = (Data)Hash[Key];
   if (d.CallBack != null & d.CallBack !="" & d.Base.GetType().GetMethod(d.CallBack) != null)
   {
    try
    {
     d.Base.GetType().InvokeMember(d.CallBack,System.Reflection.BindingFlags.InvokeMethod, null,d.Base,null);
    }
    catch
    {}
   }
   Hash.Remove(Key);
  }

  private sealed class Data
  {
   public DateTime time;
   public object Base;
   public string CallBack="";
   public bool IsLast = false;

   public Data(object data, DateTime RemoveTime, string CallBack)
   {
    this.Base = data;
    this.time = RemoveTime;
    this.CallBack = CallBack;
   }
  }
}
}