blocks|key|3067241|text|下面是我所做的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3067242|public+class+NonAuthenticatedOnlyCacheAttribute+:+OutputCacheAttribute
{
++++public+override+void+OnResultExecuting(ResultExecutingContext+filterContext)
++++{
++++++var+httpContext+=+filterContext.HttpContext;

++++++if+(httpContext.User.Identity.IsAuthenticated)
++++++{
++++++++//+it's+crucial+not+to+cache+Authenticated+content
++++++++Location+=+OutputCacheLocation.None;
++++++}

++++++//+this+smells+a+little+but+it+works
++++++httpContext.Response.Cache.AddValidationCallback(IgnoreAuthenticated,+null);

++++++base.OnResultExecuting(filterContext);
++++}

++++//+This+method+is+called+each+time+when+cached+page+is+going+to+be
++++//+served+and+ensures+that+cache+is+ignored+for+authenticated+users.
++++private+void+IgnoreAuthenticated(HttpContext+context,+object+data,+ref+HttpValidationStatus+validationStatus)
++++{
++++++if+(context.User.Identity.IsAuthenticated)++++++++++++
++++++++validationStatus+=+HttpValidationStatus.IgnoreThisRequest;++++++++++
++++++else++++++++++
++++++++validationStatus+=+HttpValidationStatus.Valid;++++++++++
++++}
}|code-block|syntax|javascript|3067243|非常感谢Craig+Stuntz，他为我指明了正确的方向，我在不知不觉中否决了他的答案。|offset|length|3067244|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/users/7714/craig-stuntz^0|0|0|4|C|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

So here is what I done:

<pre><code>public class NonAuthenticatedOnlyCacheAttribute : OutputCacheAttribute
{
 public override void OnResultExecuting(ResultExecutingContext filterContext)
 {
 var httpContext = filterContext.HttpContext;

 if (httpContext.User.Identity.IsAuthenticated)
 {
 // it's crucial not to cache Authenticated content
 Location = OutputCacheLocation.None;
 }

 // this smells a little but it works
 httpContext.Response.Cache.AddValidationCallback(IgnoreAuthenticated, null);

 base.OnResultExecuting(filterContext);
 }

 // This method is called each time when cached page is going to be
 // served and ensures that cache is ignored for authenticated users.
 private void IgnoreAuthenticated(HttpContext context, object data, ref HttpValidationStatus validationStatus)
 {
 if (context.User.Identity.IsAuthenticated) 
 validationStatus = HttpValidationStatus.IgnoreThisRequest; 
 else 
 validationStatus = HttpValidationStatus.Valid; 
 }
}
</code></pre>

Many thanks to <a href="https://stackoverflow.com/users/7714/craig-stuntz">Craig Stuntz</a> who pointed me to correct direction and whose answer I unwittingly downvoted.

blocks|key|3280345|text|属性一般都是缓存的，然后你需要存储原始位置。如果您访问记录的页面，它会将位置设置为None，然后当您以匿名身份访问时，它仍然为None。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3280346|public+class+AuthenticatedOnServerCacheAttribute+:+OutputCacheAttribute
{
++++private+OutputCacheLocation?+originalLocation;

++++public+override+void+OnResultExecuting(ResultExecutingContext+filterContext)
++++{
++++++++var+httpContext+=+filterContext.HttpContext;

++++++++if+(httpContext.User.Identity.IsAuthenticated)
++++++++{
++++++++++++originalLocation+=+originalLocation+??+Location;
++++++++++++Location+=+OutputCacheLocation.None;
++++++++}
++++++++else
++++++++{
++++++++++++Location+=+originalLocation+??+Location;
++++++++}

++++++++base.OnResultExecuting(filterContext);
++++}
}|code-block|syntax|javascript|3280347|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|$]]

Attributes in general are cached, then you need to store original Location. If you access the page Logged, it set Location to None, then when you access as anonymous, it still None.

<pre><code>public class AuthenticatedOnServerCacheAttribute : OutputCacheAttribute
{
 private OutputCacheLocation? originalLocation;

 public override void OnResultExecuting(ResultExecutingContext filterContext)
 {
 var httpContext = filterContext.HttpContext;

 if (httpContext.User.Identity.IsAuthenticated)
 {
 originalLocation = originalLocation ?? Location;
 Location = OutputCacheLocation.None;
 }
 else
 {
 Location = originalLocation ?? Location;
 }

 base.OnResultExecuting(filterContext);
 }
}
</code></pre>

blocks|key|3280478|text|公认的答案是正确的，但它不适用于以这种方式缓存部分视图。我组合了这两种方法：GetVaryByCustomString和set+Duration+to+the+minimum+-用于局部视图，AddValidationCallback方法用于页面。实际上，只使用第一种方法是可能的，但第二种方法看起来不是很昂贵-它不会每次都调用OnResultExecuting，而只调用已注册的处理程序。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3280479|因此，自定义缓存属性类|3280480|public+class+CacheAttribute+:+OutputCacheAttribute
{+++

++++public+CacheAttribute()
++++{
++++++Duration+=+300;++/*default+cache+time*/
++++}

++++private+bool+_partialView;

++++///+<summary>
++++///+Set+true+if+Partial+view+is+cached
++++///+</summary>
++++public+bool+PartialView
++++{
++++++get+{+return+_partialView;+}
++++++set
++++++{
++++++++_partialView+=+value;
++++++++if+(+_partialView+)+{
++++++++++VaryByCustom+=+"Auth";
++++++++}
++++++}
++++}

++++public+override+void+OnResultExecuting(ResultExecutingContext+filterContext)
++++{
++++++++if+(+PartialView+)+OnCachePartialEnabled(+filterContext+);
++++++++else+OnCacheEnabled(filterContext);

++++++++base.OnResultExecuting(+filterContext+);+++++
++++}

++++private+OutputCacheLocation?+originalLocation;
++++private+int?+_prevDuration;
++++protected+void+OnCachePartialEnabled(ResultExecutingContext+filterContext)
++++{
++++++var+httpContext+=+filterContext.HttpContext;

++++++if+(+!_prevDuration.HasValue)+_prevDuration+=+Duration;
++++++Duration+=+httpContext.User.Identity.IsAuthenticated+?+1+:+_prevDuration.Value;
++++}

++++protected+void+OnCacheEnabled(ResultExecutingContext+filterContext)
++++{
++++++var+httpContext+=+filterContext.HttpContext;

++++++if+(+httpContext.User.Identity.IsAuthenticated+)+{
++++++++//+it's+crucial+not+to+cache+Authenticated+content
++++++++originalLocation+=+originalLocation+??+Location;
++++++++Location+=+OutputCacheLocation.None;
++++++}
++++++else+{
++++++Location+=+originalLocation+??+Location;
++++}

++++++//+this+smells+a+little+but+it+works
++++++httpContext.Response.Cache.AddValidationCallback(+IgnoreAuthenticated,+null+);++++++
++++}

++++//+This+method+is+called+each+time+when+cached+page+is+going+to+be
++++//+served+and+ensures+that+cache+is+ignored+for+authenticated+users.
++++private+void+IgnoreAuthenticated(HttpContext+context,+object+data,+ref+HttpValidationStatus+validationStatus)
++++{
++++++validationStatus+=+context.User.Identity.IsAuthenticated+
++++++++?+HttpValidationStatus.IgnoreThisRequest+
++++++++:+HttpValidationStatus.Valid;
++++}
}|code-block|syntax|javascript|3280481|覆盖Global.asax.cs中的GetVaryByCustomString方法|3280482|public+override+string+GetVaryByCustomString(HttpContext+context,+string+custom)
{+
++++if+(+custom+==+"Auth"+)+{
++++++//do+not+cache+when+user+is+authenticated
++++++if+(+context.User.Identity.IsAuthenticated+)+{
++++++++return+base.GetVaryByCustomString(+context,+custom+);
++++++}
++++++return+"NotAuth";
++++}+++++
++++return+base.GetVaryByCustomString(+context,+custom+);
}|3280483|像这样使用它：|3280484|[Cache]
public+virtual+ActionResult+Index()
{
++++return+PartialView();
}

[ChildActionOnly,+Cache(PartialView=true)]
public+virtual+ActionResult+IndexPartial()
{
++++return+PartialView();
}|3280485|更新:我还在这里添加了Fujiy的修复|3280486|entityMap^0|12|L|1S|8|2O|L|4K|H|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]|$9|11|A|12|B|C]|$9|13|A|14|B|C]|$9|15|A|16|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|17|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|18|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|19|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|1A|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|1B|8|@]|D|@]|E|$]]|$1|S|3|T|5|J|7|1C|8|@]|D|@]|E|$K|L]]|$1|U|3|V|5|6|7|1D|8|@]|D|@]|E|$]]|$1|W|3|-4|5|6|7|1E|8|@]|D|@]|E|$]]]|X|$]]

The accepted answer is correct but it doesn't work for caching in this way Partial views.
I have combined both variants:
<code>GetVaryByCustomString</code> and set <code>Duration</code> to the minimum - for Partial Views and <code>AddValidationCallback</code> method for pages. Actually it is possible to use only the first method but the second one looks not such expensive - it doesn't call <code>OnResultExecuting</code> each time but only registered handler.

So the custom cache attribute class

<pre><code>public class CacheAttribute : OutputCacheAttribute
{ 

 public CacheAttribute()
 {
 Duration = 300; /*default cache time*/
 }

 private bool _partialView;

 /// &lt;summary&gt;
 /// Set true if Partial view is cached
 /// &lt;/summary&gt;
 public bool PartialView
 {
 get { return _partialView; }
 set
 {
 _partialView = value;
 if ( _partialView ) {
 VaryByCustom = "Auth";
 }
 }
 }

 public override void OnResultExecuting(ResultExecutingContext filterContext)
 {
 if ( PartialView ) OnCachePartialEnabled( filterContext );
 else OnCacheEnabled(filterContext);

 base.OnResultExecuting( filterContext ); 
 }

 private OutputCacheLocation? originalLocation;
 private int? _prevDuration;
 protected void OnCachePartialEnabled(ResultExecutingContext filterContext)
 {
 var httpContext = filterContext.HttpContext;

 if ( !_prevDuration.HasValue) _prevDuration = Duration;
 Duration = httpContext.User.Identity.IsAuthenticated ? 1 : _prevDuration.Value;
 }

 protected void OnCacheEnabled(ResultExecutingContext filterContext)
 {
 var httpContext = filterContext.HttpContext;

 if ( httpContext.User.Identity.IsAuthenticated ) {
 // it's crucial not to cache Authenticated content
 originalLocation = originalLocation ?? Location;
 Location = OutputCacheLocation.None;
 }
 else {
 Location = originalLocation ?? Location;
 }

 // this smells a little but it works
 httpContext.Response.Cache.AddValidationCallback( IgnoreAuthenticated, null ); 
 }

 // This method is called each time when cached page is going to be
 // served and ensures that cache is ignored for authenticated users.
 private void IgnoreAuthenticated(HttpContext context, object data, ref HttpValidationStatus validationStatus)
 {
 validationStatus = context.User.Identity.IsAuthenticated 
 ? HttpValidationStatus.IgnoreThisRequest 
 : HttpValidationStatus.Valid;
 }
}
</code></pre>

Override GetVaryByCustomString method in Global.asax.cs

<pre><code>public override string GetVaryByCustomString(HttpContext context, string custom)
{ 
 if ( custom == "Auth" ) {
 //do not cache when user is authenticated
 if ( context.User.Identity.IsAuthenticated ) {
 return base.GetVaryByCustomString( context, custom );
 }
 return "NotAuth";
 } 
 return base.GetVaryByCustomString( context, custom );
}
</code></pre>

Use it like this:

<pre><code>[Cache]
public virtual ActionResult Index()
{
 return PartialView();
}

[ChildActionOnly, Cache(PartialView=true)]
public virtual ActionResult IndexPartial()
{
 return PartialView();
}
</code></pre>

Updated: I have also added Fujiy's fix here

I have an ASP.NET MVC application. I need to cache some pages however only for non-authenticated users.

I've tried to use <code>VaryByCustom="user"</code> with the following <code>GetVaryByCustomString</code> implementation:

<pre><code>public override string GetVaryByCustomString(HttpContext context, string custom)
{
 if (custom == "user")
 {
 if (context.User.Identity.IsAuthenticated)
 {
 return context.User.Identity.Name;
 }
 else
 {
 return "";
 }
 } 

 return base.GetVaryByCustomString(context, custom);
}
</code></pre>

However this isn't exactly what I need because pages are still cached. Only difference is that now is cached for each user separately.

One possible solution is to return <code>Guid.NewGuid()</code> each time when user is Authenticated, but it looks like a huge waste of resources to me.

So do you have any tips for me?

How to turn output caching off for authenticated users in ASP.NET MVC?

身份验证

我有一个ASP.NET MVC应用程序。我需要缓存一些页面，但是，对于未经认证的用户，只有。我尝试在下面的GetVaryByCustomString实现中使用VaryByCustom="user"：public override string GetVaryByCustomString(HttpContext cont...

问如何在ASP.NET MVC中为认证用户关闭输出缓存？
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