我怎样才能得到一个HttpRuntime.Cache对象的到期日期时间？ [英] How can I get the expiry datetime of an HttpRuntime.Cache object?

问题描述

时有可能得到期满的DateTime 的 HttpRuntime.Cache 对象？

Is it possible to get the expiry DateTime of an HttpRuntime.Cache object?

如果是这样，这将是最好的方法？

If so, what would be the best approach?

推荐答案

我刚刚通过的System.Web.Caching.Cache进去反射器。这似乎是一个涉及过期日期标记为内部的一切。唯一的地方，我发现公众对它的访问，是通过Cache.Add和Cache.Insert方法。

I just went through the System.Web.Caching.Cache in reflector. It seems like everything that involves the expiry date is marked as internal. The only place i found public access to it, was through the Cache.Add and Cache.Insert methods.

所以它看起来像你的运气了，除非你想通过反思，我不建议，除非你真的真的需要这个日期。

So it looks like you are out of luck, unless you want to go through reflection, which I wouldn't recommend unless you really really need that date.

但是，如果你想反正这样做，那么这里是一些code，它会做的伎俩：

But if you wish to do it anyway, then here is some code that would do the trick:

private DateTime GetCacheUtcExpiryDateTime(string cacheKey)
{
	object cacheEntry = Cache.GetType().GetMethod("Get", BindingFlags.Instance | BindingFlags.NonPublic).Invoke(Cache, new object[] { cacheKey, 1 });
	PropertyInfo utcExpiresProperty = cacheEntry.GetType().GetProperty("UtcExpires", BindingFlags.NonPublic | BindingFlags.Instance);
	DateTime utcExpiresValue = (DateTime)utcExpiresProperty.GetValue(cacheEntry, null);

	return utcExpiresValue;
}

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