突然发现缓存这么好用

object obj = HttpRuntime.Cache.Get(key);
if (obj == null )
{
    Debug.WriteLine(key + "被添加进Cache, 过期时间一分钟");
    HttpRuntime.Cache.Add(key, "1", null, Cache.NoAbsoluteExpiration, new TimeSpan(TimeSpan.TicksPerMinute), CacheItemPriority.Normal, CacheItemRemovedCallback);
}
else
{
    Debug.WriteLine(key + "已存在Cache中, 勿重复添加");
}

CacheItemRemovedCallback为缓存过期时的回调方法