C#清除所有缓存和显示所有缓存代码

C#清除所有缓存和显示所有缓存代码，具体如下：

//清除所有缓存
     protected void RemoveAllCache()
     {
        System.Web.Caching.Cache _cache = HttpRuntime.Cache;
        IDictionaryEnumerator CacheEnum = _cache.GetEnumerator();
        ArrayList al = new ArrayList();
        while (CacheEnum.MoveNext())
        {
           al.Add(CacheEnum.Key);
        }
        foreach (string key in al)
        {
           _cache.Remove(key);
        }
        show();
     } 

     //显示所有缓存
     void show()
     {
        string str = "";
        IDictionaryEnumerator CacheEnum = HttpRuntime.Cache.GetEnumerator();
       
        while (CacheEnum.MoveNext())
        {
           str += "缓存名<b>[" + CacheEnum.Key+"]</b><br />" ;
        }
       //"当前网站总缓存数:" + HttpRuntime.Cache.Count + "<br />"+str;
     }