blocks|key|1685055|text|您可以发送HTTP标头来防止它被缓存：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1685056|Cache-control:+no-cache
Pragma:+no-cache|code-block|syntax|javascript|1685057|如何做到这一点取决于您正在使用的web服务器。|1685058|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|$]]

You could send HTTP headers to prevent it from caching:

<pre><code>Cache-control: no-cache
Pragma: no-cache
</code></pre>

How you do this depends on the web server you're using.

blocks|key|1685087|text|您可能会发现Caching+Tutorial+for+Web+Authors+and+Webmasters很有帮助。本文档讨论了客户端和服务器通过哪些不同的缓存进行交互(浏览器、代理、网关)，以及如何控制缓存。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1685088|entityMap|0|LINK|mutability|MUTABLE|url|http://www.mnot.net/cache_docs/^0|6|1B|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

You might find the <a href="http://www.mnot.net/cache_docs/" rel="noreferrer">Caching Tutorial for Web Authors and Webmasters</a> helpful. This document discusses the different caches through which the client and server interact (browser, proxy, gateway) and how caching can be controlled.

blocks|key|1469897|text|我们也处于同样的情况，我们希望控制何时将.XAP文件下载到浏览器。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1469898|您可能想要了解的一种方法是使用Silverlight独立存储作为“缓存”来存储.XAP文件。|1469899|请查看此博客：IsolatedStorage+as+a+Silverlight+object+cache|offset|length|1469900|entityMap|0|LINK|mutability|MUTABLE|url|http://timheuer.com/blog/archive/2008/09/24/silverlight-isolated-storage-caching.aspx^0|0|0|7|19|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@$F|S|G|T|1|U]]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

We are also in the same situation wherein we want to control when the .XAP file gets downloaded to the browser.

An approach that you might want to take a look at is to use the Silverlight Isolated Storage as a "cache" to store your .XAP files.

Check out this blog: <a href="http://timheuer.com/blog/archive/2008/09/24/silverlight-isolated-storage-caching.aspx" rel="nofollow noreferrer">IsolatedStorage as a Silverlight object cache</a>

blocks|key|1685156|text|一个非常简单的想法:只需在url中添加一个假的查询字符串。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1685157|<param+name="source"+value="app.xap?r12345"/>|code-block|syntax|javascript|1685158|大多数服务器应该忽略它，正常地为文件提供服务--这取决于您的服务器。如果您真的很聪明，您可以使宿主页面成为动态的，并自动将滴答计数或日期时间字符串附加到查询字符串。这确保了您在需要缓存时获得缓存，但在发生更改时强制下载。|1685159|理想情况下，您的服务器应该为您完成此操作。但如果不是..。|1685160|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]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

A super simple idea: just add a fake query string to the url.

<pre><code>&lt;param name="source" value="app.xap?r12345"/&gt;
</code></pre>

Most servers should ignore it and server the file normally--depends on your server. If you get really clever, you could make the hosting page dynamic and automatically append a tick-count or date-time string to the query string. This ensures that you get caching when you want it, but force a download when there's a change.

Ideally, your server should do this for you. But if not...

blocks|key|1685193|text|我有这个问题，所以现在当我启动一个新的应用程序时，我将程序集版本设置为0.0.0.1，并在每次部署时逐个更新它，似乎已经为我解决了这个问题。然后在发布时将其设置回1.0.0.0即可。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1685194|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I had this issue so now when I start a new application I set the assembly version to 0.0.0.1 and just update it by one on every deployment, seems to have solved it for me. Then just set it back to 1.0.0.0 on release.

blocks|key|1469994|text|到目前为止，一旦出现问题，我找到的唯一解决方案就是清除Firefox缓存。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1469995|一个更好的解决方案会更好。|1469996|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

So far, the only solution that I have found, once the problem occurs, is to clear the Firefox cache.

A better solution would be much better.

blocks|key|1470024|text|另一种解决方案是附加XAP文件的版本，而不是时间戳。时间戳每次都会改变(最好关闭缓存)。要使其仅在XAP更新时更改，需要从XAP文件中获取一些信息。我还在寻找我可以使用的东西，也许是XAP文件的最后修改日期戳？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1470025|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Another solution would be to append the version of the XAP file rather than a timestamp. The timestamp would change every time (might as well turn off caching). To get it to only change when the XAP has been updated would be to take some info from the XAP file. 
Am still looking into what I could use, perhaps the last modified datestamp of the XAP file?

blocks|key|1470034|text|最简单的方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1470035|<param+name="source"+value="ClientBin/App.xap?<%25=+DateTime.Now.Ticks+%25>"+/>|code-block|syntax|javascript|1470036|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|$]]

Simplest way:

<pre><code>&lt;param name="source" value="ClientBin/App.xap?&lt;%= DateTime.Now.Ticks %&gt;" /&gt;
</code></pre>

blocks|key|1470087|text|这就是我在php中做的事情。读取xap文件的日期/时间，并将其作为参数附加到下载链接。通过这种方式，浏览器将新文件版本视为新链接，因此不在其缓存中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1470088|<?php+$fdate+=+date("dHis",filemtime("MyApp.xap"))+?>

<param+name="source"+value="MyApp.xap?=<?php+echo+$fdate+?>"/>|code-block|syntax|javascript|1470089|很简单，而且很管用。此外，当没有要下载的更新时，浏览器会继续正确地缓存。|1470090|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|$]]

This is what I do in php. You read the date/time of the xap file, and append it as a parameter to the download link. In that way the browser sees new file versions as new links, and therefore not in its cache.

<pre><code>&lt;?php $fdate = date("dHis",filemtime("MyApp.xap")) ?&gt;

&lt;param name="source" value="MyApp.xap?=&lt;?php echo $fdate ?&gt;"/&gt;
</code></pre>

Simple and it works. Also, browsers continue to cache correctly when there are no updates to download.

blocks|key|1685346|text|您可以在object标记中将源url附加上XAP文件的上次写入日期。在我的blog上检查代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1685347|entityMap|0|LINK|mutability|MUTABLE|url|http://codeblog.larsholm.net/2010/02/avoid-incorrect-caching-of-silverlight-xap-file/^0|11|4|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

You can append the source url in the object tag with the last-write date of the XAP file. Check the code at my <a href="http://codeblog.larsholm.net/2010/02/avoid-incorrect-caching-of-silverlight-xap-file/" rel="nofollow noreferrer">blog</a>.

blocks|key|1685419|text|在Silverlight4中，查询字符串的想法对我不起作用。服务器似乎缓存了可恶的xap+(尽管不是aspx文件)。在SL4中工作的解决方案是转到您的Silverlight项目的属性，转到程序集信息并输入一个版本。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1685420|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

The query string idea doesn't work for me in Silverlight 4. The server seems to cache the darned xap (though not the aspx file). The solution that does work in SL4 is to go to properties on your Silverlight project, go to Assembly info and put in a version.

blocks|key|1470270|text|为XAP添加时间戳对我来说很有效(我在javascript中添加SL控件，但这也可以很容易地在内联中完成)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1470271|var+appTimestamp+=+'<%25=+System.IO.File.GetLastWriteTime(Server.MapPath("ClientBin/MyApp.xap"))+%25>';
var+source+=+'ClientBin/MyApp.xap?appTimestamp='+%2B+appTimestamp;|code-block|syntax|javascript|1470272|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|$]]

Adding the timestamp for the XAP worked for me (I'm adding the SL control in javascript but this could just as easily be done inline):

<pre><code>var appTimestamp = '&lt;%= System.IO.File.GetLastWriteTime(Server.MapPath("ClientBin/MyApp.xap")) %&gt;';
var source = 'ClientBin/MyApp.xap?appTimestamp=' + appTimestamp;
</code></pre>

blocks|key|1685569|text|对我来说，最好的答案来自Chris+Cairns。我只是稍微修改了一下，调用了ToString和GetHashCode，生成了时间戳的ID：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1685570|<param+name="source"+value="ClientBin/App.xap?<%25=+System.IO.File.GetLastWriteTime(Server.MapPath("ClientBin/App.xap")).ToString().GetHashCode()%25>"+/>|code-block|syntax|javascript|1685571|工作得很好！|1685572|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/307709/how-do-you-force-firefox-to-not-cache-or-re-download-a-silverlight-xap-file/4032381#4032381^0|C|C|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

For me, the best answer is from <a href="https://stackoverflow.com/questions/307709/how-do-you-force-firefox-to-not-cache-or-re-download-a-silverlight-xap-file/4032381#4032381">Chris Cairns</a>. I've just adapted it a little, calling ToString and GetHashCode, generating an ID to the timestamp:

<pre><code>&lt;param name="source" value="ClientBin/App.xap?&lt;%= System.IO.File.GetLastWriteTime(Server.MapPath("ClientBin/App.xap")).ToString().GetHashCode()%&gt;" /&gt;
</code></pre>

Works just fine!

blocks|key|1685577|text|我使用this+solution|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1685578|<object+id="Xaml1"+data="data:application/x-silverlight-2,"+type="application/x-silverlight-2"
width="100%25"+height="100%25">
<%25––<param+name="source"+value="ClientBin/SilverlightApp.xap"/>––%25>
<%25
string+orgSourceValue+=+@"ClientBin/SilverlightApp.xap";
string+param;
if+(System.Diagnostics.Debugger.IsAttached)
param+=+"<param+name=\"source\"+value=\""+%2B+orgSourceValue+%2B+"\"+/>";
else
{
string+xappath+=+HttpContext.Current.Server.MapPath(@"")+%2B+@"\"+%2B+orgSourceValue;
DateTime+xapCreationDate+=+System.IO.File.GetLastWriteTime(xappath);
param+=+"<param+name=\"source\"+value=\""+%2B+orgSourceValue+%2B+"?ignore="
%2B+xapCreationDate.ToString()+%2B+"\"+/>";
}
Response.Write(param);
%25>
<param+name="onError"+value="onSilverlightError"+|code-block|syntax|javascript|1685579|entityMap|0|LINK|mutability|MUTABLE|url|http://codeblog.larsholm.net/2010/02/avoid-incorrect-caching-of-silverlight-xap-file/^0|3|D|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

I use <a href="http://codeblog.larsholm.net/2010/02/avoid-incorrect-caching-of-silverlight-xap-file/" rel="nofollow">this solution</a>

<pre><code>&lt;object id="Xaml1" data="data:application/x-silverlight-2," type="application/x-silverlight-2"
width="100%" height="100%"&gt;
&lt;%––&lt;param name="source" value="ClientBin/SilverlightApp.xap"/&gt;––%&gt;
&lt;%
string orgSourceValue = @"ClientBin/SilverlightApp.xap";
string param;
if (System.Diagnostics.Debugger.IsAttached)
param = "&lt;param name=\"source\" value=\"" + orgSourceValue + "\" /&gt;";
else
{
string xappath = HttpContext.Current.Server.MapPath(@"") + @"\" + orgSourceValue;
DateTime xapCreationDate = System.IO.File.GetLastWriteTime(xappath);
param = "&lt;param name=\"source\" value=\"" + orgSourceValue + "?ignore="
+ xapCreationDate.ToString() + "\" /&gt;";
}
Response.Write(param);
%&gt;
&lt;param name="onError" value="onSilverlightError" 
</code></pre>

blocks|key|1685619|text|这是经过测试并正常工作的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1685620|放在这里：|1685621|<%25
++++const+string+sourceValue+=+@"ClientBin/MyXapFile.xap";
++++string+param;

++++if(System.Diagnostics.Debugger.IsAttached)
++++++++param+=+"<param+name=\"source\"+value=\""+%2B+sourceValue+%2B+"\"+/>";
++++else
++++{
++++++++var+xappath+=+HttpContext.Current.Server.MapPath(@"")+%2B+@"\"+%2B+sourceValue;
++++++++var+xapCreationDate+=+System.IO.File.GetLastWriteTime(xappath);

++++++++param+=+"<param+name=\"source\"+value=\""+%2B+sourceValue+%2B+"?ignore="
++++++++%2B+xapCreationDate+%2B+"\"+/>";
++++}
++++Response.Write(param);
%25>|code-block|syntax|javascript|1685622|而不是这样：|1685623|<param+name="source"+value="ClientBin/MyXapFile.xap"+/>|1685624|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

This tested and working:

Put this:

<pre><code>&lt;%
 const string sourceValue = @"ClientBin/MyXapFile.xap";
 string param;

 if(System.Diagnostics.Debugger.IsAttached)
 param = "&lt;param name=\"source\" value=\"" + sourceValue + "\" /&gt;";
 else
 {
 var xappath = HttpContext.Current.Server.MapPath(@"") + @"\" + sourceValue;
 var xapCreationDate = System.IO.File.GetLastWriteTime(xappath);

 param = "&lt;param name=\"source\" value=\"" + sourceValue + "?ignore="
 + xapCreationDate + "\" /&gt;";
 }
 Response.Write(param);
%&gt;
</code></pre>

Instead of this:

<pre><code>&lt;param name="source" value="ClientBin/MyXapFile.xap" /&gt;
</code></pre>

When working with Silverlight, I've noticed that Firefox will cache the XAP file, so if I do an update, a user may be stuck using an outdated version. Is there a way to force the browser to either re-download the XAP file every time, or maybe only force it to after an update has been published? Or is there a setting in the Silverlight config that stops the browser from caching the XAP file altogether?

Thanks,
jeff

How do you force Firefox to not cache or re-download a Silverlight XAP file?

服务器

在使用Silverlight时，我注意到Firefox将缓存XAP文件，因此如果我进行更新，用户可能会使用过时的版本。有没有办法强制浏览器每次都重新下载XAP文件，或者只在更新发布后才重新下载？或者，Silverlight配置中是否有一个设置可以完全阻止浏览器缓存XAP文件？谢谢，杰夫

问如何强制Firefox不缓存或重新下载Silverlight XAP文件？
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