system.web.caching.cache是.net为我们提供的一个轻量级的缓存，它提供了最基础的增，增过期，删除，获取等操作，下面是对cache进行的一个封装，方便以后统一调用和扩展。
/// <summary>
/// 缓o存?相à关?的?操ù作&pide;类à
/// 占?占?
/// </summary>
public class datacache
{
/// <summary>
/// 获?取?当±前°应|用?程ì序ò指?定¨cachekey的?cache值μ
/// </summary>
/// <param name=”cachekey”></param>
/// <returns></returns>
public static object getcache(string cachekey)
{
system.web.caching.cache objcache = httpruntime.cache;
return objcache[cachekey];
}
/// <summary>
/// 设è置?当±前°应|用?程ì序ò指?定¨cachekey的?cache值μ
/// 调&pide;用?：odatacache.setcache(“name”, “zzl”);
/// </summary>
/// <param name=”cachekey”></param>
/// <param name=”objobject”></param>
public static void setcache(string cachekey, object objobject)
{
system.web.caching.cache objcache = httpruntime.cache;
objcache.insert(cachekey, objobject);
}
/// <summary>
/// 设è置?当±前°应|用?程ì序ò指?定¨cachekey的?cache值μ
/// 调&pide;用?：odatacache.setcache(“name”, “zzl”, datetime.now.addminutes(1), timespan.zero);
/// </summary>
/// <param name=”cachekey”></param>
/// <param name=”objobject”></param>
public static void setcache(string cachekey, object objobject, datetime absoluteexpiration, timespan slidingexpiration)
{
system.web.caching.cache objcache = httpruntime.cache;
objcache.insert(cachekey, objobject, null, absoluteexpiration, slidingexpiration);
}
/// <summary>
/// 移?除y指?定¨cache
/// </summary>
/// <param name=”cachekey”></param>
public static void removecache(string cachekey)
{
system.web.caching.cache objcache = httpruntime.cache;
objcache.remove(cachekey);
}
#region events
/// <summary>
/// 缓o存?删?除y事?件t
/// </summary>
public static event cacheeventhandler cachedeleted;
#endregion
#region methods
/// <summary>
/// 触￥发￠缓o存?删?除y事?件t
/// </summary>
public static void oncachedeleted(string key)
{
if ((cachedeleted != null))
{
cachedeleted(null, new cacheeventargs(key));
}
remove(key);
}
#endregion
}
#region delegates
/// <summary>
/// 缓o存?委ˉ托d
/// </summary>
/// <param name=”sender”></param>
/// <param name=”e”></param>
public delegate void cacheeventhandler(object sender, cacheeventargs e);
#endregion
/// <summary>
/// 缓o存?事?件t源′
/// </summary>
public class cacheeventargs
{
public cacheeventargs()
{
}
public cacheeventargs(string cachekey)
{
this.cachekey = cachekey;
}
public string cachekey { get; set; }
}
在这个类中，有一个关于删除键时的事件，它的作用是在删除某个键时，进行与它关联的其它操作，例如：在用户登出时，希望将它的cache记录清除，并删除一些记录性的操作，但记录性的操作是不固定的，为了为破坏程序的完整性，我们可以在登出时，先去将其需要的操作进行有订阅，如果以后有其它删除cache键需要的关联操作，只要订阅就可以了
代码如下：
static commonmethod()
{
iuserrepository = new userrepository();
//订?阅?了?cachedeleted这a个?事?件t，?当±它ü被?触￥发￠时±，?将?自?动ˉ执′行d被?绑ó定¨的?方?法¨
datacache.cachedeleted += new cacheeventhandler(clearuserrecord);
datacache.cachedeleted += new cacheeventhandler(clearproductrecord);
}
#region 删?除ycache后ó，?需è要a做?的?其?它ü事?情é
static void clearuserrecord(object sender, cacheeventargs e)
{
datacache.setcache(“msg1”, e.cachekey + “被?删?除y了?”);
}
static void clearproductrecord(object sender, cacheeventargs e)
{
datacache.setcache(“msg2”, e.cachekey + “真?的?被?删?除y了?”);
}
#endregion
在登出操作后，可以去触发删除cache键的操作：
public static actionresult userlogoutmodule(controller controller)
{
string returnurl = controller.request.querystring[“returnurl”];
standard.clienthelper.userlogout();
datacache.oncachedeleted(“name”);
摘自 lose.zhang
