blocks|key|1567702|text|嗯。您可以在OutputCache项上指定VaryByCustom属性。它的值作为参数传递给可以在global.asax中实现的GetVaryByCustomString方法。此方法返回的值用作缓存项目的索引-例如，如果您返回页面上的评论数量，则每次添加评论时，都会缓存一个新页面。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1567703|需要注意的是，这实际上并不会清除缓存。如果博客条目的评论使用率很高，您的缓存可能会使用此方法爆炸式增长。|1567704|或者，您可以将页面的不可更改部分(导航、广告、实际的博客条目)实现为用户控件，并在每个用户控件上实现部分页面缓存。|1567705|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Hmm. You can specify a VaryByCustom attribute on the OutputCache item. The value of this is passed as a parameter to the GetVaryByCustomString method that you can implement in global.asax. The value returned by this method is used as an index into the cached items - if you return the number of comments on the page, for instance, each time a comment is added a new page will be cached.

The caveat to this is that this does not actually clear the cache. If a blog entry gets heavy comment usage, your cache could explode in size with this method.

Alternatively, you could implement the non-changeable bits of the page (the navigation, ads, the actual blog entry) as user controls and implement partial page caching on each of those user controls.

blocks|key|1567774|text|如果您仅将"*“更改为缓存应启用的参数(PostID?)你可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1567775|//add+dependency
string+key+=+"post.aspx?id="+%2B+PostID.ToString();
Cache[key]+=+new+object();
Response.AddCacheItemDependency(key);|code-block|syntax|javascript|1567776|当有人添加评论的时候...|1567777|Cache.Remove(key);|1567778|我猜这在VaryByParam+*上也行得通，因为所有的请求都绑定到相同的缓存依赖项上。|1567779|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

If you change "*" to just the parameters the cache should vary on (PostID?) you can do something like this:

<pre><code>//add dependency
string key = "post.aspx?id=" + PostID.ToString();
Cache[key] = new object();
Response.AddCacheItemDependency(key);
</code></pre>

and when someone adds a comment...

<pre><code>Cache.Remove(key);
</code></pre>

I guess this would work even with VaryByParam *, since all requests would be tied to the same cache dependency.

blocks|key|1782781|text|我找到了我想要的答案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1782782|HttpResponse.RemoveOutputCacheItem("/caching/CacheForever.aspx");|code-block|syntax|javascript|1782783|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I've found the answer I was looking for:

<pre><code>HttpResponse.RemoveOutputCacheItem("/caching/CacheForever.aspx");
</code></pre>

blocks|key|1782831|text|使用Response.AddCacheItemDependency清除所有输出缓存。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1782832|++public+class+Page+:+System.Web.UI.Page
++{
++++protected+override+void+OnLoad(EventArgs+e)
++++{
++++++++try
++++++++{
++++++++++++string+cacheKey+=+"cacheKey";
++++++++++++object+cache+=+HttpContext.Current.Cache[cacheKey];
++++++++++++if+(cache+==+null)
++++++++++++{
++++++++++++++HttpContext.Current.Cache[cacheKey]+=+DateTime.UtcNow.ToString();
++++++++++++}

++++++++++++Response.AddCacheItemDependency(cacheKey);
++++++++}
++++++++catch+(Exception+ex)
++++++++{
++++++++++++throw+new+SystemException(ex.Message);
++++++++}

++++++++base.OnLoad(e);
++++}+++++
+}



++//+Clear+All+OutPutCache+Method++++

++++public+void+ClearAllOutPutCache()
++++{
++++++++string+cacheKey+=+"cacheKey";
++++++++HttpContext.Cache.Remove(cacheKey);
++++}|code-block|syntax|javascript|1782833|这也可以在ASP.NET+MVC的OutputCachedPage中使用。|1782834|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Using Response.AddCacheItemDependency to clear all outputcaches.

<pre><code> public class Page : System.Web.UI.Page
 {
 protected override void OnLoad(EventArgs e)
 {
 try
 {
 string cacheKey = "cacheKey";
 object cache = HttpContext.Current.Cache[cacheKey];
 if (cache == null)
 {
 HttpContext.Current.Cache[cacheKey] = DateTime.UtcNow.ToString();
 }

 Response.AddCacheItemDependency(cacheKey);
 }
 catch (Exception ex)
 {
 throw new SystemException(ex.Message);
 }

 base.OnLoad(e);
 } 
 }



 // Clear All OutPutCache Method 

 public void ClearAllOutPutCache()
 {
 string cacheKey = "cacheKey";
 HttpContext.Cache.Remove(cacheKey);
 }
</code></pre>

This is also can be used in ASP.NET MVC's OutputCachedPage.

blocks|key|1782873|text|为什么不在posts表上使用sqlcachedependency？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1782874|sqlcachedependency+msdn|offset|length|1782875|这样的话，你不会实现自定义缓存清除代码，而只是在数据库中的内容发生变化时刷新缓存？|1782876|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/ms178604.aspx^0|0|0|N|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@$D|R|E|S|1|T]]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

why not use the sqlcachedependency on the posts table?

<a href="http://msdn.microsoft.com/en-us/library/ms178604.aspx" rel="nofollow noreferrer">sqlcachedependency msdn</a>

This way your not implementing custom cache clearing code and simply refreshing the cache as the content changes in the db?

blocks|key|1567996|text|如果您知道要为哪些页清除缓存，则上述方法很好用。在我的实例(ASP.NET+MVC)中，我引用了来自各地的相同数据。因此，当我执行保存操作时，我希望清除站点范围内的缓存。这就是对我有效的方法：http://aspalliance.com/668|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1567997|这是在OnActionExecuting过滤器的上下文中完成的。这可以通过在BaseController或其他什么东西中重写OnActionExecuting来轻松完成。|1567998|HttpContextBase+httpContext+=+filterContext.HttpContext;
httpContext.Response.AddCacheItemDependency("Pages");|code-block|syntax|javascript|1567999|设置：|1568000|protected+void+Application_Start()
{
++++HttpRuntime.Cache.Insert("Pages",+DateTime.Now);
}|1568001|小调整:我有一个助手，添加“闪光消息”(错误消息，成功消息-“此项目已成功保存”等)。为了避免在每次GET中都显示flash消息，我必须在写入flash消息后使其失效。|1568002|清除缓存：|1568003|HttpRuntime.Cache.Insert("Pages",+DateTime.Now);|1568004|希望这能有所帮助。|1568005|entityMap|0|LINK|mutability|MUTABLE|url|http://aspalliance.com/668^0|2O|Q|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@$A|15|B|16|1|17]]|C|$]]|$1|D|3|E|5|6|7|18|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|19|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|1A|8|@]|9|@]|C|$]]|$1|M|3|N|5|H|7|1B|8|@]|9|@]|C|$I|J]]|$1|O|3|P|5|6|7|1C|8|@]|9|@]|C|$]]|$1|Q|3|R|5|6|7|1D|8|@]|9|@]|C|$]]|$1|S|3|T|5|H|7|1E|8|@]|9|@]|C|$I|J]]|$1|U|3|V|5|6|7|1F|8|@]|9|@]|C|$]]|$1|W|3|-4|5|6|7|1G|8|@]|9|@]|C|$]]]|X|$Y|$5|Z|10|11|C|$12|13]]]]

The above are fine if you know what pages you want to clear the cache for. In my instance (ASP.NET MVC) I referenced the same data from all over. Therefore, when I did a [save] I wanted to clear cache site wide. This is what worked for me: <a href="http://aspalliance.com/668" rel="noreferrer">http://aspalliance.com/668</a>

This is done in the context of an OnActionExecuting filter. It could just as easily be done by overriding OnActionExecuting in a BaseController or something.

<pre><code>HttpContextBase httpContext = filterContext.HttpContext;
httpContext.Response.AddCacheItemDependency("Pages");
</code></pre>

Setup:

<pre><code>protected void Application_Start()
{
 HttpRuntime.Cache.Insert("Pages", DateTime.Now);
}
</code></pre>

Minor Tweak:
I have a helper which adds "flash messages" (Error messages, success messages - "This item has been successfully saved", etc). In order to avoid the flash message from showing up on every subsequent GET, I had to invalidate after writing the flash message.

Clearing Cache:

<pre><code>HttpRuntime.Cache.Insert("Pages", DateTime.Now);
</code></pre>

Hope this helps.

blocks|key|1568070|text|HttpRuntime.Close()+..我尝试了所有的方法，这是唯一对我有效的方法|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1568071|entityMap^0|0|J|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

<code>HttpRuntime.Close()</code> .. I try all method and this is the only that work for me

blocks|key|1783104|text|在母版页load事件中，请写入以下内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1783105|Response.Cache.SetExpires(DateTime.UtcNow.AddMinutes(-1));
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.Cache.SetNoStore();|code-block|syntax|javascript|1783106|然后在注销按钮中单击：|1783107|Session.Abandon();
Session.Clear();|1783108|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

On the master page load event, please write the following:

<pre><code>Response.Cache.SetExpires(DateTime.UtcNow.AddMinutes(-1));
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.Cache.SetNoStore();
</code></pre>

and in the logout button click:

<pre><code>Session.Abandon();
Session.Clear();
</code></pre>

For my blog I am wanting to use the Output Cache to save a cached version of a perticular post for around 10 minutes, and thats fine...

<pre><code>&lt;%@OutputCache Duration="600" VaryByParam="*" %&gt;
</code></pre>

However, if someone posts a comment, I want to clear the cache so that the page is refreshed and the comment can be seen.

How do I do this in ASP.Net C#?

Clearing Page Cache in ASP.NET

数据库

对于我的博客，我想使用输出缓存来保存一个缓存版本的永久帖子大约10分钟，这是很好的…<%@OutputCache Duration="600" VaryByParam="*" %>但是，如果有人发表了评论，我想要清除缓存，这样页面就会刷新，评论就可以看到了。如何在ASP.Net C#中执行此操作？

问清除ASP.NET中的页面缓存
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